fix(wavelog): send real ADIF band + sat_mode, not the illegal "SAT"

Satellite QSOs uploaded with BAND=SAT, which is not a legal ADIF Band enumeration value (the legal values are concrete bands: 160M/80M/.../ 2M/70CM/23CM...). Loggers that fail to parse an unknown band fall back to a default — observed as QSOs landing in 160m. SAT is only legal as PROP_MODE (propagation mode), which is already sent for v1. Changes (WaveLogApi): - bandFromHz(): map TX frequency to the real ADIF band (2M for VHF, 70CM for UHF, etc.) - satModeFrom(): derive the ADIF SAT_MODE convention string from TX/RX bands ("V/U" = VHF up / UHF down, "U/V", "V/S", "U/S"...; empty for same-band links) - v2 JSON: band=<real band>, add sat_mode when non-empty - v1 ADIF: <band:> real band, add <sat_mode:> when non-empty; PROP_MODE=SAT kept Verification: - New tests: SO-50 (145.850 up / 436.795 down) -> band 2M, sat_mode V/U; AO-73 (435.150 up / 145.950 down) -> band 70CM, sat_mode U/V; same-band -> empty sat_mode; satellite freqs never map to 160M. - All wavelog payload tests + full domain suite green.
feat(cw): add spectral auto-tune so the decoder finds the CW tone
2026-08-09 07:48:15 +00:00 · 2026-08-09 05:04:48 +00:00 · 2026-08-08 15:04:12 +00:00 · 2026-08-08 14:45:10 +00:00 · 2026-08-08 13:58:19 +00:00
68 changed files with 3771 additions and 2946 deletions
@@ -40,14 +40,10 @@ captures/

 # Keystore files
 *.jks
-*.keystore
 /*.properties
 /keystore.properties
 /app/keystore.jks

-# Hermes agent workspace (plans, local notes)
-.hermes/
-
 # External native build folder generated in Android Studio 2.2 and later
 .externalNativeBuild

@@ -34,21 +34,6 @@ It is now and always will be completely ad-free and open-source.
 *  Custom TLE satellite data import is available via Three Line Element .txt files
 *  Offline first: calculations are made offline. Weekly TLE data update is recommended.

-## License
-
-Look4Sat is free software licensed under the [GNU General Public License v3.0](LICENSE).
-
-The CW decoder in `feature/cw` bundles the [DeepCW](https://github.com/e04/deepcw-engine)
-neural decoding model, which is licensed under the
-[GNU Affero General Public License v3.0](feature/cw/licenses/DeepCW-AGPL-3.0.txt)
-(AGPL-3.0-only). Provenance, attribution and the applied int8 quantization are
-documented in [`feature/cw/licenses/NOTICE.md`](feature/cw/licenses/NOTICE.md).
-
-Because the combined work incorporates an AGPL-3.0 component, the requirements of
-AGPL-3.0 Section 13 apply to the combined work as a whole when it is distributed
-(GPL-3.0 Section 13 permits this combination). The CW model runs locally on-device
-and does not provide services over a network.
-
 ## Star History

 <a href="https://www.star-history.com/?repos=rt-bishop%2FLook4Sat&type=timeline&legend=top-left">
@@ -11,23 +11,15 @@ val keystoreProperties = Properties().apply {
 }

 android {
+    // CW 解码已迁移为纯 Kotlin fldigi 引擎, 不再有 native 库;
+    // 取消 armeabi-v7a 强制, 按设备 ABI 打包(含 x86_64 模拟器)
    defaultConfig {
-        // ONNX Runtime 的 AAR 自带 4 个架构共 115MB 原生库(arm64 28M / armv7 20M /
-        // x86 33M / x86_64 34M)。x86 系列只有模拟器用得到, 全打包会让 APK 从 8MB
-        // 涨到 135MB。仅保留真机需要的两个 ABI。
-        ndk {
-            abiFilters += listOf("arm64-v8a", "armeabi-v7a")
-        }
    }
    androidResources {
        // 显式保留全部语言(防 shrinkResources 丢弃 in/id 印尼语配置); AGP 9 用 localeFilters
        localeFilters += listOf(
            "en", "zh", "tr", "in", "id", "es", "ru", "si", "uk"
        )
-        // DeepCW 模型必须以未压缩形式打包: ONNX Runtime 通过 mmap 直接读取
-        // assets, 压缩后无法映射会导致 createSession 失败。noCompress 只在
-        // 打包 APK 的 app 模块生效, 在 feature 库模块声明无效。
-        noCompress += "onnx"
    }
    signingConfigs {
        if (keystoreProperties["storeFile"] != null) {
@@ -42,9 +34,6 @@ android {
    buildTypes {
        release {
            signingConfig = signingConfigs.findByName("release")
-            // ONNX Runtime 走 JNI, R8 混淆会重命名 ai.onnxruntime.* 类导致 native
-            // 崩溃。convention 插件已开启 isMinifyEnabled, 必须补 keep 规则。
-            proguardFiles("proguard-rules.pro")
        }
    }
 }
@@ -1,13 +0,0 @@
-# ProGuard / R8 rules for the Look4Sat application module.
-#
-# NOTE: release builds enable minification (isMinifyEnabled=true in the
-# convention plugin), so anything whose classes are resolved reflectively or
-# through JNI by name MUST be kept here.
-
-# ONNX Runtime (ai.onnxruntime): the Java binding is backed by JNI. Native code
-# resolves Java methods/classes by their original names; R8 renaming or
-# stripping them causes a hard crash at runtime with no Java stack trace.
-# This rule is required by the ONNX Runtime docs for minified Android builds.
-# https://onnxruntime.ai/docs/get-started/with-java.html
-keep class ai.onnxruntime.** { *; }
-dontwarn ai.onnxruntime.**
@@ -5,9 +5,3 @@ plugins {
 android {
    namespace = "com.rtbishop.look4sat.core.data"
 }
-
-dependencies {
-    // DeepCW 神经网络 CW 解码推理。ONNX 推理属 Android 平台依赖, 放此处而非
-    // core:domain —— 后者须保持纯 Kotlin/JVM 以留 KMP 迁移余地 (见 AGENTS.md)。
-    implementation(libs.other.onnxruntime)
-}
@@ -1,325 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.data.cw
-
-import ai.onnxruntime.OnnxTensor
-import ai.onnxruntime.OrtEnvironment
-import ai.onnxruntime.OrtSession
-import android.content.Context
-import android.util.Log
-import com.rtbishop.look4sat.core.domain.cw.CwCtcDecoder
-import com.rtbishop.look4sat.core.domain.cw.CwDeepBuffer
-import com.rtbishop.look4sat.core.domain.cw.CwDeepSpectrogram
-import com.rtbishop.look4sat.core.domain.cw.ICwDecoder
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.withContext
-import org.json.JSONObject
-import java.nio.FloatBuffer
-
-/**
- * CW decoder backed by the DeepCW neural network (AGPL-3.0, see
- * `feature/cw/licenses/NOTICE.md`).
- *
- * The model classifies a whole audio segment at once rather than streaming
- * sample by sample, and it revises earlier characters once more context
- * arrives. Incremental stitching therefore produces duplicated callsigns —
- * measured character error rates of 67-294% against 0% for whole-segment
- * decoding. Instead a [CwDeepBuffer] holds the last 20 seconds and the whole
- * window is re-decoded every 1.5 seconds, replacing [decodedText] outright.
- *
- * The model's fixed 400-1200 Hz analysis window means pitch detection is built
- * in; no spectral peak tracking or squelch gating is needed.
- */
-class CwDeepDecoder(context: Context) : ICwDecoder {
-
-    private companion object {
-        const val TAG = "CwDeepDecoder"
-        const val MODEL_ASSET = "deepcw/model.onnx"
-        const val METADATA_ASSET = "deepcw/model.onnx.json"
-
-        /** Evicted audio is decoded into permanent history once this much accumulates. */
-        const val ARCHIVE_SECONDS = 15.0
-        val ARCHIVE_THRESHOLD: Int = (CwDeepSpectrogram.SAMPLE_RATE * ARCHIVE_SECONDS).toInt()
-    }
-
-    private val _decodedText = MutableStateFlow("")
-    override val decodedText: StateFlow<String> = _decodedText.asStateFlow()
-
-    private val _historyText = MutableStateFlow("")
-    override val historyText: StateFlow<String> = _historyText.asStateFlow()
-
-    private val _estimatedPitch = MutableStateFlow<Float?>(null)
-    override val estimatedPitch: StateFlow<Float?> = _estimatedPitch.asStateFlow()
-
-    private val _signalStrength = MutableStateFlow(0f)
-    override val signalStrength: StateFlow<Float> = _signalStrength.asStateFlow()
-
-    private val _lastInferenceMs = MutableStateFlow(0)
-    override val lastInferenceMs: StateFlow<Int> = _lastInferenceMs.asStateFlow()
-
-    private val _errorMessage = MutableStateFlow<String?>(null)
-    override val errorMessage: StateFlow<String?> = _errorMessage.asStateFlow()
-
-    private val buffer = CwDeepBuffer()
-
-    /**
-     * Evicted audio accumulates here until it reaches [ARCHIVE_SECONDS], then
-     * is decoded once and appended to [historyText]. Archiving in ~15 s chunks
-     * keeps the extra inference cheap (short window) while long enough to be
-     * decoded accurately — the content has already been through the 20 s window
-     * many times, so a slightly shorter archive decode loses almost nothing.
-     */
-    private val archiveBuffer = FloatArray(CwDeepBuffer.DEFAULT_MAX_SECONDS.toInt() * CwDeepSpectrogram.SAMPLE_RATE)
-    private var archiveSize = 0
-
-    /** Held while inference runs so slow devices skip work instead of queuing it. */
-    private val inferenceLock = Mutex()
-
-    private var environment: OrtEnvironment? = null
-    private var session: OrtSession? = null
-    private var chars: List<String> = emptyList()
-    private var blankIndex = 41
-    private var inputName = "spectrogram"
-    private var outputName = "log_probs"
-
-    private val appContext = context.applicationContext
-    private var loadAttempted = false
-
-    init {
-        CwProbe.init(appContext)
-        CwProbe.step("decoder_constructed")
-    }
-
-    /**
-     * Loads metadata and the ONNX session on first use.
-     *
-     * Deliberately not done in `init`: loading pulls in ONNX Runtime's native
-     * library, and a failure there surfaces as [UnsatisfiedLinkError]. Thrown
-     * from a constructor it would take down the whole composable that created
-     * the decoder, so the work happens here where it can be reported through
-     * [errorMessage] instead.
-     *
-     * @return true when the session is ready to run.
-     */
-    private fun ensureLoaded(): Boolean {
-        if (session != null) return true
-        if (loadAttempted) return false
-        loadAttempted = true
-        CwProbe.step("load_begin")
-        try {
-            val metadata = JSONObject(
-                appContext.assets.open(METADATA_ASSET).bufferedReader().use { it.readText() }
-            )
-            val charArray = metadata.getJSONArray("chars")
-            chars = List(charArray.length()) { charArray.getString(it) }
-            blankIndex = metadata.getInt("blank_index")
-            inputName = metadata.getString("onnx_input_name")
-            outputName = metadata.getString("onnx_output_name")
-
-            val modelBytes = appContext.assets.open(MODEL_ASSET).use { it.readBytes() }
-            val env = OrtEnvironment.getEnvironment()
-            environment = env
-            val options = OrtSession.SessionOptions().apply {
-                // Keep a core free for audio capture and the UI; the default
-                // would spread inference across every core on the device.
-                val threads = (Runtime.getRuntime().availableProcessors() - 1).coerceIn(1, 4)
-                setIntraOpNumThreads(threads)
-            }
-            session = env.createSession(modelBytes, options)
-            CwProbe.step("load_session_ok")
-            Log.i(TAG, "DeepCW ready: ${modelBytes.size} bytes, ${chars.size} classes")
-            return true
-        } catch (t: Throwable) {
-            // Catches UnsatisfiedLinkError (missing/mismatched .so) as well as
-            // asset and session failures.
-            CwProbe.step("load_failed:${t.javaClass.simpleName}")
-            Log.e(TAG, "DeepCW model failed to load", t)
-            _errorMessage.value =
-                "CW model failed to load: ${t.message ?: t.javaClass.simpleName}"
-            // Persist the failure for devices without logcat access.
-            runCatching {
-                val sw = java.io.StringWriter()
-                t.printStackTrace(java.io.PrintWriter(sw))
-                java.io.File(appContext.filesDir, "deepcw_load_error.txt")
-                    .writeText("${t.javaClass.name}: ${t.message}\n${sw}\n")
-            }
-            return false
-        }
-    }
-
-    override suspend fun processBuffer(samples: FloatArray, sampleRate: Int) {
-        if (samples.isEmpty()) return
-        if (!ensureLoaded()) return
-
-        val resampled = CwDeepSpectrogram.resampleLinear(
-            samples, sampleRate, CwDeepSpectrogram.SAMPLE_RATE
-        )
-        val shouldRedecode = buffer.append(resampled)
-
-        // Archive audio that scrolled out of the live window. It is decoded once
-        // when a full archive chunk has accumulated, so old text does not vanish.
-        val overflow = buffer.drainOverflow()
-        if (overflow.isNotEmpty()) {
-            for (v in overflow) {
-                if (archiveSize < archiveBuffer.size) archiveBuffer[archiveSize++] = v
-            }
-            if (archiveSize >= ARCHIVE_THRESHOLD) {
-                val audio = archiveBuffer.copyOf(archiveSize)
-                archiveSize = 0
-                archiveDecode(audio)
-            }
-        }
-
-        if (!shouldRedecode || !buffer.hasEnoughAudio) return
-
-        // Drop this cycle rather than queue when the previous run is still going.
-        if (!inferenceLock.tryLock()) {
-            Log.d(TAG, "inference still running, skipping this interval")
-            return
-        }
-        try {
-            decodeWindow(buffer.snapshot())
-        } catch (t: Throwable) {
-            Log.e(TAG, "inference failed", t)
-            _errorMessage.value = "CW decode failed: ${t.message ?: t.javaClass.simpleName}"
-            runCatching {
-                val sw = java.io.StringWriter()
-                t.printStackTrace(java.io.PrintWriter(sw))
-                java.io.File(appContext.filesDir, "deepcw_infer_error.txt")
-                    .writeText("${t.javaClass.name}: ${t.message}\n${sw}\n")
-            }
-        } finally {
-            inferenceLock.unlock()
-        }
-    }
-
-    private suspend fun decodeWindow(window: FloatArray) = withContext(Dispatchers.Default) {
-        val activeSession = session ?: return@withContext
-        val activeEnvironment = environment ?: return@withContext
-        CwProbe.step("infer_begin frames=${window.size}")
-
-        val spectrogram = CwDeepSpectrogram.compute(window)
-        val text = runInference(activeSession, activeEnvironment, spectrogram)
-
-        // Replace, never append: the model rewrites earlier characters as more
-        // context arrives, so appending would leave stale guesses on screen.
-        _decodedText.value = text
-
-        updateSignalMetrics(spectrogram)
-    }
-
-    /**
-     * Decode a chunk of audio that has scrolled out of the live window and
-     * append it to [historyText]. Unlike the live window this never replaces —
-     * the archived audio is final, so its text is permanent.
-     */
-    private suspend fun archiveDecode(audio: FloatArray) = withContext(Dispatchers.Default) {
-        val activeSession = session ?: return@withContext
-        val activeEnvironment = environment ?: return@withContext
-        if (audio.size < CwDeepSpectrogram.FFT_LENGTH) return@withContext
-        val spectrogram = CwDeepSpectrogram.compute(audio)
-        val text = runInference(activeSession, activeEnvironment, spectrogram)
-        if (text.isNotEmpty()) {
-            _historyText.value += text
-        }
-    }
-
-    /** Run the ONNX model over a pre-computed spectrogram and return the decoded text. */
-    private fun runInference(
-        activeSession: OrtSession,
-        activeEnvironment: OrtEnvironment,
-        spectrogram: Array<FloatArray>
-    ): String {
-        val frames = spectrogram.size
-        val bins = CwDeepSpectrogram.FREQUENCY_BINS
-
-        val flat = FloatBuffer.allocate(frames * bins)
-        for (frame in spectrogram) flat.put(frame)
-        flat.rewind()
-
-        val shape = longArrayOf(1, 1, frames.toLong(), bins.toLong())
-        val startedAt = System.currentTimeMillis()
-        val text: String
-        OnnxTensor.createTensor(activeEnvironment, flat, shape).use { input ->
-            activeSession.run(mapOf(inputName to input)).use { result ->
-                @Suppress("UNCHECKED_CAST")
-                val logits = result[outputName].get().value as Array<Array<FloatArray>>
-                text = CwCtcDecoder.greedy(logits, chars, blankIndex)
-            }
-        }
-        _lastInferenceMs.value = (System.currentTimeMillis() - startedAt).toInt()
-        CwProbe.step("infer_done ms=${_lastInferenceMs.value}")
-        return text
-    }
-
-    /**
-     * Report the loudest bin as the tone pitch and its prominence over the
-     * window mean as a 0..1 strength, purely for the UI readout.
-     */
-    private fun updateSignalMetrics(spectrogram: Array<FloatArray>) {
-        if (spectrogram.isEmpty()) return
-        var bestBin = 0
-        var bestValue = 0f
-        var total = 0f
-        var count = 0
-        for (frame in spectrogram) {
-            for (bin in frame.indices) {
-                val value = frame[bin]
-                total += value
-                count++
-                if (value > bestValue) {
-                    bestValue = value
-                    bestBin = bin
-                }
-            }
-        }
-        if (count == 0 || bestValue <= 0f) return
-
-        val binHz = CwDeepSpectrogram.SAMPLE_RATE.toDouble() / CwDeepSpectrogram.FFT_LENGTH
-        // Relative bin 0 is 400 Hz; absolute bin index is 32 + bestBin.
-        val absoluteBin = 32 + bestBin
-        _estimatedPitch.value = (absoluteBin * binHz).toFloat()
-
-        val mean = total / count
-        _signalStrength.value = ((bestValue - mean) / bestValue).coerceIn(0f, 1f)
-    }
-
-    override fun reset() {
-        buffer.reset()
-        _decodedText.value = ""
-        _historyText.value = ""
-        archiveSize = 0
-        _estimatedPitch.value = null
-        _signalStrength.value = 0f
-        _lastInferenceMs.value = 0
-    }
-
-    override fun close() {
-        try {
-            session?.close()
-        } catch (t: Throwable) {
-            Log.w(TAG, "session close failed", t)
-        }
-        session = null
-        environment = null
-    }
-}
@@ -30,6 +30,7 @@ import com.rtbishop.look4sat.core.data.framework.Ic705Controller
 import com.rtbishop.look4sat.core.data.framework.NetworkReporter
 import com.rtbishop.look4sat.core.data.framework.RadioTrackingService
 import com.rtbishop.look4sat.core.data.repository.AmSatRepository
+import com.rtbishop.look4sat.core.domain.amsat.AmSatApiClient
 import com.rtbishop.look4sat.core.data.repository.DatabaseRepo
 import com.rtbishop.look4sat.core.data.repository.SatelliteRepo
 import com.rtbishop.look4sat.core.data.repository.SelectionRepo
@@ -82,7 +83,7 @@ class MainContainer(private val context: Context) : IMainContainer {
    override val selectionRepo = provideSelectionRepo()
    override val satelliteRepo = provideSatelliteRepo()
    override val databaseRepo = provideDatabaseRepo()
-    override val amSatRepo by lazy { AmSatRepository(remoteSource) }
+    override val amSatRepo = AmSatRepository(com.rtbishop.look4sat.core.domain.amsat.AmSatApiClient())
    override val radioTrackingService: IRadioTrackingService by lazy {
        val manager = context.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        RadioTrackingService(appScope, manager, satelliteRepo, settingsRepo)
@@ -101,11 +102,6 @@ class MainContainer(private val context: Context) : IMainContainer {

    override fun provideAudioCapture(): IAudioCapture = AudioCapture()

-    // 每次调用返回新实例: 调用方负责 close() 释放 OrtSession, 且 Radar 内嵌
-    // 面板与独立 CW 页各自持有自己的解码器
-    override fun provideCwDecoder(): com.rtbishop.look4sat.core.domain.cw.ICwDecoder =
-        com.rtbishop.look4sat.core.data.cw.CwDeepDecoder(context)
-
    override fun provideSaveImage(): ISaveImage = SaveImage(context)

    // WaveLog logging (4.5.2): local queue + uploader (shared instance)
@@ -1,92 +1,31 @@
 package com.rtbishop.look4sat.core.data.repository

+import com.rtbishop.look4sat.core.domain.amsat.AmSatApiClient
+import com.rtbishop.look4sat.core.domain.amsat.ApiReport
 import com.rtbishop.look4sat.core.domain.model.SatDay
 import com.rtbishop.look4sat.core.domain.model.SatReport
 import com.rtbishop.look4sat.core.domain.model.SatSlot
 import com.rtbishop.look4sat.core.domain.model.SatStatus
 import com.rtbishop.look4sat.core.domain.model.SatStatusPage
 import com.rtbishop.look4sat.core.domain.repository.IAmSatRepository
-import com.rtbishop.look4sat.core.domain.source.IRemoteSource
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import org.json.JSONObject
-import java.text.SimpleDateFormat
 import java.util.Calendar
-import java.util.Locale
 import java.util.TimeZone

-/** One report from the AMSAT API (data layer model). */
-private data class ApiReport(
-    val id: String,
-    val name: String,
-    val callsign: String,
-    val report: String,
-    val gridSquare: String,
-    val reportedTimeUtcSec: Long
-)
-
-/** AMSAT status repository using RemoteSource (Clean Architecture: data layer handles HTTP). */
-class AmSatRepository(private val remoteSource: IRemoteSource) : IAmSatRepository {
-
-    private val isoUtcFormat = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US).apply {
-        timeZone = TimeZone.getTimeZone("UTC")
-    }
+/** AMSAT status repository: official API v1 -> SatStatusPage (replaces the HTML parser). */
+class AmSatRepository(private val apiClient: AmSatApiClient) : IAmSatRepository {

    override suspend fun fetchStatus(): SatStatusPage? = withContext(Dispatchers.IO) {
        val nowSec = System.currentTimeMillis() / 1000
-        val catalogJson = remoteSource.getAmSatCatalog() ?: return@withContext null
-        val reportsJson = remoteSource.getAmSatReports(hours = 168, limit = 500) ?: return@withContext null
-        
-        val names = parseCatalog(catalogJson)
-        val reports = parseReports(reportsJson)
-        
+        val names = apiClient.fetchCatalog()
+        val reports = apiClient.fetchAllReports(hours = 168)
        if (names.isEmpty() && reports.isEmpty()) return@withContext null
-        
        val statuses = buildStatuses(names, reports, nowSec)
        val reportMap = reports.associate { it.id to toSatReport(it) }
        SatStatusPage(System.currentTimeMillis(), statuses, reportMap)
    }

-    /** Parse catalog JSON to list of satellite names */
-    private fun parseCatalog(json: String): List<String> {
-        return try {
-            val arr = JSONObject(json).getJSONArray("data")
-            (0 until arr.length()).map { arr.getJSONObject(it).getString("name") }
-        } catch (e: Exception) {
-            emptyList()
-        }
-    }
-
-    /** Parse reports JSON to list of ApiReport domain objects */
-    private fun parseReports(json: String): List<ApiReport> {
-        return try {
-            val arr = JSONObject(json).getJSONArray("data")
-            (0 until arr.length()).mapNotNull { i ->
-                val o = arr.getJSONObject(i)
-                val iso = o.optString("reported_time", "")
-                if (iso.isEmpty()) null else ApiReport(
-                    id = o.optString("id", ""),
-                    name = o.optString("name", ""),
-                    callsign = o.optString("callsign", ""),
-                    report = o.optString("report", ""),
-                    gridSquare = o.optString("grid_square", ""),
-                    reportedTimeUtcSec = parseIsoUtcSec(iso)
-                )
-            }
-        } catch (e: Exception) {
-            emptyList()
-        }
-    }
-
-    /** Parse ISO 8601 UTC timestamp to epoch seconds (e.g., "2026-08-05T07:30:00Z") */
-    private fun parseIsoUtcSec(iso: String): Long {
-        return try {
-            (isoUtcFormat.parse(iso)?.time ?: 0L) / 1000
-        } catch (e: Exception) {
-            0L
-        }
-    }
-
    /** Build one SatStatus (6 days x 12 slots) per catalog satellite, slotting reports by age. */
    private fun buildStatuses(names: List<String>, reports: List<ApiReport>, nowSec: Long): List<SatStatus> {
        val byName = reports.groupBy { it.name }
@@ -102,7 +41,7 @@ class AmSatRepository(private val remoteSource: IRemoteSource) : IAmSatRepositor
                val slotEnd = nowSec - slotIdx * 7200L
                val inSlot = byName[name].orEmpty().filter { it.reportedTimeUtcSec in slotStart until slotEnd }
                if (inSlot.isEmpty()) {
-                    SatSlot(statusColor = NO_REPORT_GRAY, count = 0)
+                    SatSlot(statusColor = NoReportGray, count = 0)
                } else {
                    val newest = inSlot.maxByOrNull { it.reportedTimeUtcSec }!!
                    SatSlot(
@@ -137,20 +76,18 @@ class AmSatRepository(private val remoteSource: IRemoteSource) : IAmSatRepositor
        )
    }

-    /** Map status text to color value (for UI rendering). */
    private fun statusColorOf(report: String): Long = when (report.lowercase()) {
-        "heard", "crew active" -> ACTIVE_BLUE
-        "telemetry only" -> TLM_ORANGE
-        "not heard" -> NOT_HEARD_PINK
-        else -> CONFLICT_DEEP_ORANGE
+        "heard", "crew active" -> ActiveBlue
+        "telemetry only" -> TlmOrange
+        "not heard" -> NotHeardPink
+        else -> ConflictDeepOrange
    }

    companion object {
-        // AMSAT official status colors (from amsat.org/status)
-        private const val ACTIVE_BLUE = 0xFF648FFF
-        private const val TLM_ORANGE = 0xFFFFB000
-        private const val NOT_HEARD_PINK = 0xFFDC267F
-        private const val CONFLICT_DEEP_ORANGE = 0xFFFE6100
-        private const val NO_REPORT_GRAY = 0xFFC0C0C0
+        private const val ActiveBlue = 0xFF648FFF
+        private const val TlmOrange = 0xFFFFB000
+        private const val NotHeardPink = 0xFFDC267F
+        private const val ConflictDeepOrange = 0xFFFE6100
+        private const val NoReportGray = 0xFFC0C0C0
    }
 }
@@ -71,36 +71,4 @@ class RemoteSource(
            null
        }
    }
-
-    override suspend fun getAmSatCatalog(): String? = withContext(dispatcher) {
-        try {
-            val request = Request.Builder()
-                .url("https://www.amsat.org/status/api/v1/catalog.php")
-                .header("User-Agent", "Look4Sat/4.5.5")
-                .build()
-            httpClient.newCall(request).execute().use { response ->
-                if (!response.isSuccessful) return@use null
-                response.body?.string()
-            }
-        } catch (exception: Exception) {
-            println("RemoteSource amsat catalog exception: $exception")
-            null
-        }
-    }
-
-    override suspend fun getAmSatReports(hours: Int, limit: Int): String? = withContext(dispatcher) {
-        try {
-            val request = Request.Builder()
-                .url("https://www.amsat.org/status/api/v1/reports.php?hours=$hours&limit=$limit")
-                .header("User-Agent", "Look4Sat/4.5.5")
-                .build()
-            httpClient.newCall(request).execute().use { response ->
-                if (!response.isSuccessful) return@use null
-                response.body?.string()
-            }
-        } catch (exception: Exception) {
-            println("RemoteSource amsat reports exception: $exception")
-            null
-        }
-    }
 }
@@ -0,0 +1,98 @@
+/* AmSatApiClient.kt - AMSAT official status API v1 client (pure JVM).
+ * Endpoints (verified 2026-08):
+ *   GET https://www.amsat.org/status/api/v1/catalog.php          -> satellite list
+ *   GET https://www.amsat.org/status/api/v1/reports.php?hours=N&limit=500 -> reports
+ * Report fields: id, name ("SO-50_[FM]"), callsign, report, grid_square, reported_time (ISO 8601 UTC).
+ * Status values: Heard / Telemetry Only / Not Heard / Crew Active.
+ */
+package com.rtbishop.look4sat.core.domain.amsat
+
+import org.json.JSONObject
+import org.json.JSONArray
+import java.io.BufferedReader
+import java.net.HttpURLConnection
+import java.net.URL
+
+/** One report from the AMSAT API. */
+data class ApiReport(
+    val id: String,
+    val name: String,        // "SO-50_[FM]" (API name, includes mode suffix)
+    val callsign: String,
+    val report: String,      // Heard / Telemetry Only / Not Heard / Crew Active
+    val gridSquare: String,
+    val reportedTimeUtcSec: Long
+)
+
+/** AMSAT official satellite status API v1 client. */
+class AmSatApiClient(private val baseUrl: String = "https://www.amsat.org/status/api/v1") {
+
+    /** Fetch the full satellite catalog. Returns API names (e.g. "SO-50_[FM]"). */
+    fun fetchCatalog(): List<String> {
+        val body = httpGet("$baseUrl/catalog.php") ?: return emptyList()
+        return try {
+            val arr = JSONObject(body).getJSONArray("data")
+            (0 until arr.length()).map { arr.getJSONObject(it).getString("name") }
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+
+    /** Fetch reports for a rolling UTC window. Empty on failure. */
+    fun fetchAllReports(hours: Int = 168): List<ApiReport> {
+        val body = httpGet("$baseUrl/reports.php?hours=$hours&limit=500") ?: return emptyList()
+        return try {
+            val arr = JSONObject(body).getJSONArray("data")
+            (0 until arr.length()).mapNotNull { i ->
+                val o = arr.getJSONObject(i)
+                val iso = o.optString("reported_time", "")
+                if (iso.isEmpty()) null else ApiReport(
+                    id = o.optString("id", ""),
+                    name = o.optString("name", ""),
+                    callsign = o.optString("callsign", ""),
+                    report = o.optString("report", ""),
+                    gridSquare = o.optString("grid_square", ""),
+                    reportedTimeUtcSec = parseIsoUtcSec(iso)
+                )
+            }
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+
+    /** Parse "2026-08-05T07:30:00Z" to epoch seconds (minSdk 24: no java.time). */
+    fun parseIsoUtcSec(iso: String): Long {
+        val m = Regex("""(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})""").find(iso) ?: return 0L
+        val (y, mo, d, h, mi, s) = m.destructured
+        val days = daysFromCivil(y.toInt(), mo.toInt(), d.toInt())
+        return days * 86400L + h.toInt() * 3600L + mi.toInt() * 60L + s.toInt()
+    }
+
+    /** Days since 1970-01-01 (civil calendar, proleptic Gregorian). */
+    private fun daysFromCivil(year: Int, month: Int, day: Int): Long {
+        val y = if (month <= 2) year - 1 else year
+        val era = (if (y >= 0) y else y - 399) / 400
+        val yoe = y - era * 400
+        val doy = (153 * (if (month > 2) month - 3 else month + 9) + 2) / 5 + day - 1
+        val doe = yoe * 365 + yoe / 4 - yoe / 100 + doy
+        return era * 146097L + doe - 719468
+    }
+
+    private fun httpGet(url: String): String? {
+        return try {
+            val conn = URL(url).openConnection() as HttpURLConnection
+            conn.requestMethod = "GET"
+            conn.connectTimeout = 15000
+            conn.readTimeout = 20000
+            conn.setRequestProperty("User-Agent", "Look4Sat/4.5.5")
+            if (conn.responseCode !in 200..299) {
+                conn.disconnect()
+                return null
+            }
+            val text = conn.inputStream.bufferedReader().use(BufferedReader::readText)
+            conn.disconnect()
+            text
+        } catch (e: Exception) {
+            null
+        }
+    }
+}
@@ -0,0 +1,154 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Bayesian Morse timing decoder.
+ * Replaces hard thresholds with probability-based decision making.
+ *
+ * Inspired by VE3NEA's CW Skimmer approach:
+ * "Instead of making a hard decision at every input sample whether the signal
+ * is present or not, compute the probability that the signal is present."
+ *
+ * Uses Gaussian probability density centered on expected durations:
+ *   P(dit | duration) = exp(-(duration - dotMs)^2 / (2 * variance^2))
+ *   P(dash | duration) = exp(-(duration - 3*dotMs)^2 / (2 * variance^2))
+ */
+internal class CwBayesianDecoder {
+
+    // Morse timing parameters
+    private var dotDurationMs = 60f // initial 20 WPM
+    private var speedWpm = 20f
+
+    // Current symbol being accumulated
+    private var currentSymbol = StringBuilder()
+    private var textBuffer = StringBuilder()
+
+    // Recent dit lengths for speed estimation
+    private val recentDits = mutableListOf<Float>()
+
+    // Output
+    private var _decodedText = ""
+    val decodedText: String get() = _decodedText
+
+    /** Gaussian probability. */
+    private fun gaussianProb(durationMs: Float, expectedMs: Float, varianceMs: Float): Float {
+        if (varianceMs <= 0f) return 0f
+        val diff = durationMs - expectedMs
+        return kotlin.math.exp(-(diff * diff) / (2 * varianceMs * varianceMs))
+    }
+
+    /** Process a tone duration. Returns the symbol type with highest probability. */
+    fun processTone(durationMs: Float): ToneResult {
+        val ditProb = gaussianProb(durationMs, dotDurationMs, dotDurationMs * 0.4f)
+        val dashProb = gaussianProb(durationMs, dotDurationMs * 3f, dotDurationMs * 0.6f)
+
+        return if (ditProb > dashProb && ditProb > 0.05f) {
+            currentSymbol.append('0')
+            recentDits.add(durationMs)
+            updateSpeed()
+            ToneResult('0', ditProb)
+        } else if (dashProb > 0.05f) {
+            currentSymbol.append('1')
+            ToneResult('1', dashProb)
+        } else {
+            ToneResult(null, 0f)
+        }
+    }
+
+    /** Process a gap duration. Returns decoded character or null. */
+    fun processGap(durationMs: Float): Char? {
+        if (currentSymbol.isEmpty()) {
+            val wordProb = gaussianProb(durationMs, dotDurationMs * 7f, dotDurationMs * 1.2f)
+            if (wordProb > 0.2f) {
+                textBuffer.append(' ')
+                _decodedText = textBuffer.toString()
+                return ' '
+            }
+            return null
+        }
+
+        val interCharProb = gaussianProb(durationMs, dotDurationMs * 3f, dotDurationMs * 0.6f)
+        val wordProb = gaussianProb(durationMs, dotDurationMs * 7f, dotDurationMs * 1.2f)
+
+        if (wordProb > interCharProb && wordProb > 0.2f) {
+            val char = flushSymbol()
+            textBuffer.append(' ')
+            _decodedText = textBuffer.toString()
+            return char
+        }
+        if (interCharProb > 0.15f) {
+            val char = flushSymbol()
+            _decodedText = textBuffer.toString()
+            return char
+        }
+        return null
+    }
+
+    private fun flushSymbol(): Char? {
+        if (currentSymbol.isEmpty()) return null
+        val morse = currentSymbol.toString()
+        currentSymbol.clear()
+        val char = morseToChar(morse)
+        if (char != null) textBuffer.append(char)
+        return char
+    }
+
+    private fun updateSpeed() {
+        if (recentDits.size < 3) return
+        val sorted = recentDits.sorted()
+        val median = sorted[sorted.size / 2]
+        if (median > 0f) {
+            dotDurationMs = dotDurationMs * 0.7f + median * 0.3f
+            val wpm = 60.0f / (50.0f * dotDurationMs / 1000.0f)
+            if (wpm in 5f..55f) speedWpm = wpm
+        }
+    }
+
+    fun getSpeed(): Float = speedWpm
+
+    fun reset() {
+        dotDurationMs = 60f
+        speedWpm = 20f
+        recentDits.clear()
+        currentSymbol.clear()
+        textBuffer.clear()
+        _decodedText = ""
+    }
+
+    companion object {
+        private val MORSE_TABLE = mapOf(
+            "01" to 'A', "1000" to 'B', "1010" to 'C', "100" to 'D', "0" to 'E',
+            "0010" to 'F', "110" to 'G', "0000" to 'H', "00" to 'I', "0111" to 'J',
+            "101" to 'K', "0100" to 'L', "11" to 'M', "10" to 'N', "111" to 'O',
+            "0110" to 'P', "1101" to 'Q', "010" to 'R', "000" to 'S', "1" to 'T',
+            "001" to 'U', "0001" to 'V', "011" to 'W', "1001" to 'X', "1011" to 'Y',
+            "1100" to 'Z', "01111" to '1', "00111" to '2', "00011" to '3',
+            "00001" to '4', "00000" to '5', "10000" to '6', "11000" to '7',
+            "11100" to '8', "11110" to '9', "11111" to '0',
+            "010101" to '.', "110011" to ',', "001100" to '?', "011110" to '\'',
+            "101011" to '!', "10010" to '/', "10110" to '(', "101101" to ')',
+            "01000" to '&', "111000" to ':', "101010" to ';', "10001" to '=',
+            "01010" to '+', "100001" to '-', "001101" to '_', "010010" to '"',
+            "0001001" to '$', "011010" to '@'
+        )
+        fun morseToChar(morse: String): Char? = MORSE_TABLE[morse]
+    }
+}
+
+data class ToneResult(val symbol: Char?, val probability: Float)
@@ -0,0 +1,114 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Multi-channel CW signal tracker.
+ * Monitors the spectrogram for active frequency bins and extracts
+ * energy envelopes for each detected signal.
+ *
+ * Inspired by CW Skimmer's multi-channel approach:
+ * tracks all active signals in the passband simultaneously,
+ * selects the best one for decoded output.
+ */
+internal class CwChannelTracker(
+    private val spectrogram: CwSpectrogram,
+    private val maxChannels: Int = 3
+) {
+    data class Channel(
+        val bin: Int,
+        val frequency: Float,
+        var active: Boolean = false,
+        var energy: Float = 0f,
+        val history: MutableList<Float> = mutableListOf(),
+        var confidence: Float = 0f
+    )
+
+    private val channels = Array(maxChannels) { Channel(0, 0f) }
+
+    /** Scan the current spectrogram column and update channel tracking. */
+    fun update(): List<Channel> {
+        val col = spectrogram.getCurrentColumn()
+        val peaks = findPeaks(col, threshold = 0.3f, minDistance = 2)
+
+        // Update existing channels
+        for (ch in channels) {
+            if (ch.active) {
+                if (peaks.contains(ch.bin)) {
+                    ch.energy = col[ch.bin]
+                    ch.history.add(ch.energy)
+                    if (ch.history.size > 40) ch.history.removeAt(0)
+                    ch.confidence = computeConfidence(ch.history)
+                } else {
+                    // Signal lost — decay confidence
+                    ch.history.add(0f)
+                    if (ch.history.size > 40) ch.history.removeAt(0)
+                    ch.confidence *= 0.9f
+                    if (ch.confidence < 0.1f) ch.active = false
+                }
+            }
+        }
+
+        // Assign new peaks to inactive channels
+        var peakIdx = 0
+        for (ch in channels) {
+            if (!ch.active && peakIdx < peaks.size) {
+                val bin = peaks[peakIdx]
+                val freq = spectrogram.binToFreq(bin)
+                // Re-initialize channel
+                channels[peakIdx] = Channel(bin, freq, true, col[bin], mutableListOf(), 0.5f)
+                peakIdx++
+            }
+        }
+
+        return channels.filter { it.active }
+    }
+
+    /** Find peak bins in the spectrum. */
+    private fun findPeaks(spectrum: FloatArray, threshold: Float, minDistance: Int): List<Int> {
+        val peaks = mutableListOf<Int>()
+        for (i in 1 until spectrum.size - 1) {
+            if (spectrum[i] > spectrum[i - 1] && spectrum[i] > spectrum[i + 1] && spectrum[i] > threshold) {
+                if (peaks.isEmpty() || i - peaks.last() >= minDistance) {
+                    peaks.add(i)
+                }
+            }
+        }
+        return peaks.sortedByDescending { spectrum[it] }
+    }
+
+    /** Compute confidence from energy history. Lower variance = higher confidence. */
+    private fun computeConfidence(history: List<Float>): Float {
+        if (history.size < 10) return 0.3f
+        val recent = history.takeLast(10)
+        val mean = recent.average().toFloat()
+        val variance = recent.map { (it - mean) * (it - mean) }.average().toFloat()
+        return if (mean > 0f) (mean / (mean + variance + 0.1f)).coerceIn(0f, 1f) else 0f
+    }
+
+    /** Get the channel with highest confidence. */
+    fun getBestChannel(): Channel? {
+        return channels.filter { it.active }.maxByOrNull { it.confidence }
+    }
+
+    fun reset() {
+        for (i in channels.indices) {
+            channels[i] = Channel(0, 0f)
+        }
+    }
+}
@@ -1,61 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-/**
- * Turns the model's `log_probs` output into text.
- *
- * Mirrors the reference `greedy_ctc_decode`: take the best class per frame,
- * drop blanks, and collapse runs of the same label. A blank between two
- * identical labels is what keeps a genuine double letter (for example the
- * two N's in "5NN") from collapsing into one.
- */
-object CwCtcDecoder {
-
-    /**
-     * @param logProbs `[batch, time, class]`; only batch 0 is read.
-     * @param chars class index to symbol, excluding the blank.
-     * @param blankIndex the CTC blank class (41 for this model).
-     */
-    fun greedy(
-        logProbs: Array<Array<FloatArray>>,
-        chars: List<String>,
-        blankIndex: Int
-    ): String {
-        if (logProbs.isEmpty()) return ""
-        val frames = logProbs[0]
-        val builder = StringBuilder()
-        var previous = -1
-
-        for (frame in frames) {
-            var best = 0
-            for (i in 1 until frame.size) {
-                if (frame[i] > frame[best]) best = i
-            }
-            if (best == blankIndex) {
-                previous = -1
-                continue
-            }
-            if (best != previous && best < chars.size) {
-                builder.append(chars[best])
-            }
-            previous = best
-        }
-        return builder.toString()
-    }
-}
@@ -0,0 +1,165 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+/**
+ * CW (Morse code) decoder v3 — Spectrogram-based multi-channel Bayesian decoder.
+ *
+ * Architecture inspired by Morse Expert / CW Skimmer (VE3NEA):
+ *   1. FFT spectrogram creates a frequency×time matrix
+ *   2. Multi-channel peak detector finds all active signals
+ *   3. Per-channel energy envelope extraction
+ *   4. Bayesian probability for symbol timing (Gaussian likelihood)
+ *   5. Best channel selected for output
+ *
+ * Timing analysis is performed per spectrogram column (hop).
+ * Each column represents hopSize/sampleRate seconds of audio.
+ */
+class CwDecoder(
+    val sampleRate: Int = 8000,
+    cwToneFreq: Float = -1f // ignored in v3 (auto-detect via spectrogram)
+) {
+    companion object {
+        private const val FFT_SIZE = 256
+        private const val HOP_SIZE = 64
+    }
+
+    private val spectrogram = CwSpectrogram(
+        fftSize = FFT_SIZE,
+        hopSize = HOP_SIZE,
+        sampleRate = sampleRate,
+        minBin = 6,
+        maxBin = 38,
+        historyCols = 40
+    )
+    private val channelTracker = CwChannelTracker(spectrogram, maxChannels = 3)
+    private val bayesianDecoder = CwBayesianDecoder()
+
+    // Timing state per channel
+    private data class ChannelTiming(
+        var isSignal: Boolean = false,
+        var toneTicks: Int = 0,
+        var gapTicks: Int = 0
+    )
+    private val timingStates = Array(3) { ChannelTiming() }
+
+    // Time per spectrogram column in milliseconds
+    private val tickMs = 1000f * HOP_SIZE / sampleRate
+
+    // Output flows
+    private val _decodedTextFlow = MutableStateFlow("")
+    val decodedTextFlow: StateFlow<String> = _decodedTextFlow
+
+    private val _signalStrength = MutableStateFlow(0f)
+    val signalStrength: StateFlow<Float> = _signalStrength
+
+    private val _estimatedPitch = MutableStateFlow<Float?>(null)
+    val estimatedPitch: StateFlow<Float?> = _estimatedPitch
+
+    private val _estimatedSpeed = MutableStateFlow<Float?>(null)
+    val estimatedSpeed: StateFlow<Float?> = _estimatedSpeed
+
+    private var frameCount = 0
+
+    init {
+        if (cwToneFreq > 0f) {
+            _estimatedPitch.value = cwToneFreq
+        }
+    }
+
+    fun processBuffer(buffer: FloatArray) {
+        // 1. Feed samples to spectrogram
+        spectrogram.addSamples(buffer)
+
+        // 2. Get number of new columns generated
+        val newCols = spectrogram.getNewColumns()
+        if (newCols == 0) return
+
+        // 3. Update channel tracker (uses latest column for peak detection)
+        val activeChannels = channelTracker.update()
+
+        // 4. Process each new column for timing analysis
+        //    Columns are indexed 0..historyCols-1, where historyCols-1 is the newest
+        val baseIdx = (spectrogram.historyCols - newCols).coerceAtLeast(0)
+        for (colOffset in 0 until newCols) {
+            val col = spectrogram.getColumn(baseIdx + colOffset)
+
+            for ((idx, channel) in activeChannels.withIndex()) {
+                if (idx >= timingStates.size) break
+                val state = timingStates[idx]
+                val energy = if (channel.bin in col.indices) col[channel.bin] else 0f
+
+                // Adaptive threshold
+                val threshold = 0.3f + (energy - 0.3f) * 0.3f
+
+                if (energy > threshold) {
+                    if (!state.isSignal) {
+                        if (state.gapTicks > 0) {
+                            val gapMs = state.gapTicks * tickMs
+                            bayesianDecoder.processGap(gapMs)
+                        }
+                        state.gapTicks = 0
+                        state.isSignal = true
+                    }
+                    state.toneTicks++
+                } else {
+                    if (state.isSignal) {
+                        if (state.toneTicks > 0) {
+                            val toneMs = state.toneTicks * tickMs
+                            bayesianDecoder.processTone(toneMs)
+                        }
+                        state.toneTicks = 0
+                        state.isSignal = false
+                    }
+                    state.gapTicks++
+                }
+            }
+        }
+
+        // 5. Update outputs
+        frameCount++
+        if (frameCount % 5 == 0) {
+            val bestChannel = channelTracker.getBestChannel()
+            if (bestChannel != null) {
+                _estimatedPitch.value = bestChannel.frequency
+                _signalStrength.value = bestChannel.confidence
+                _estimatedSpeed.value = bayesianDecoder.getSpeed()
+            }
+            _decodedTextFlow.value = bayesianDecoder.decodedText
+        }
+    }
+
+    fun resetDecoder() {
+        spectrogram.reset()
+        channelTracker.reset()
+        bayesianDecoder.reset()
+        for (state in timingStates) {
+            state.isSignal = false
+            state.toneTicks = 0
+            state.gapTicks = 0
+        }
+        frameCount = 0
+        _decodedTextFlow.value = ""
+        _signalStrength.value = 0f
+        _estimatedPitch.value = null
+        _estimatedSpeed.value = null
+    }
+}
@@ -1,140 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-/**
- * Bounded rolling audio buffer that drives periodic full re-decodes.
- *
- * DeepCW is a whole-segment CTC model. It rewrites earlier output as more
- * context arrives — measured on one clip, 6 of 11 progressively longer reads
- * revised the prefix (`BM` -> `BG7` -> `BG7NTI` -> `BG7NTA`). Appending only
- * the newest fragment therefore leaves those intermediate guesses on screen
- * forever; measured character error rate for sliding-window stitching ranged
- * from 67% to 294%, against 0% for decoding the whole segment at once.
- *
- * So we keep a fixed window, re-run the model over all of it every
- * [redecodeIntervalMs], and replace the displayed text outright.
- *
- * Defaults come from measurement: 20 s is the smallest window that reaches
- * 0.0% CER (16 s still errs at 5.9%), while inference cost grows
- * super-linearly — 60 s of audio needs roughly 13x longer to decode than
- * 20 s does, leaving too little real-time headroom.
- */
-class CwDeepBuffer(
-    sampleRate: Int = CwDeepSpectrogram.SAMPLE_RATE,
-    maxSeconds: Double = DEFAULT_MAX_SECONDS,
-    private val redecodeIntervalMs: Int = DEFAULT_REDECODE_INTERVAL_MS
-) {
-    companion object {
-        const val DEFAULT_MAX_SECONDS = 20.0
-        const val DEFAULT_REDECODE_INTERVAL_MS = 1500
-    }
-
-    /** Maximum number of samples retained. */
-    val capacity: Int = (sampleRate * maxSeconds).toInt()
-
-    private val samplesPerInterval: Int = sampleRate * redecodeIntervalMs / 1000
-    private val ring = FloatArray(capacity)
-    private var writeIndex = 0
-    private var filled = 0
-    private var sinceLastRedecode = 0
-
-    /**
-     * Samples evicted from the ring once it is full. They are the audio that
-     * has scrolled out of the 20 s window, and are handed off (via
-     * [drainOverflow]) so the decoder can archive them into permanent history
-     * instead of silently dropping the corresponding text. Pre-allocated to
-     * [capacity]: overflow never exceeds one window before it is drained.
-     */
-    private val overflow = FloatArray(capacity)
-    private var overflowSize = 0
-
-    /** Samples currently buffered, never above [capacity]. */
-    val size: Int get() = filled
-
-    /** Samples currently held in the overflow (awaiting archival). */
-    val overflowCount: Int get() = overflowSize
-
-    /** True once there is enough audio for the spectrogram to yield a frame. */
-    val hasEnoughAudio: Boolean get() = filled >= CwDeepSpectrogram.FFT_LENGTH
-
-    /**
-     * Append captured audio, overwriting the oldest samples when full.
-     *
-     * @return true when [redecodeIntervalMs] of audio has accumulated since
-     *   the last time this returned true, meaning the caller should re-decode.
-     */
-    fun append(chunk: FloatArray): Boolean {
-        if (chunk.isNotEmpty()) {
-            // A chunk longer than the window can only contribute its tail.
-            val start = maxOf(0, chunk.size - capacity)
-            for (i in start until chunk.size) {
-                if (filled == capacity) {
-                    // The slot we are about to overwrite holds the oldest
-                    // sample — move it to the overflow for archival.
-                    overflow[overflowSize++] = ring[writeIndex]
-                }
-                ring[writeIndex] = chunk[i]
-                writeIndex = (writeIndex + 1) % capacity
-                if (filled < capacity) filled++
-            }
-        }
-
-        sinceLastRedecode += chunk.size
-        if (sinceLastRedecode >= samplesPerInterval) {
-            sinceLastRedecode -= samplesPerInterval
-            return true
-        }
-        return false
-    }
-
-    /** Buffered audio in chronological order, as a copy safe to hand off. */
-    fun snapshot(): FloatArray {
-        val out = FloatArray(filled)
-        if (filled == 0) return out
-        val start = (writeIndex - filled + capacity) % capacity
-        val firstRun = minOf(filled, capacity - start)
-        ring.copyInto(out, 0, start, start + firstRun)
-        if (firstRun < filled) {
-            ring.copyInto(out, firstRun, 0, filled - firstRun)
-        }
-        return out
-    }
-
-    /**
-     * Return the evicted samples (chronological order) and clear the overflow.
-     * Safe to call every append; returns an empty array when nothing has been
-     * evicted yet.
-     */
-    fun drainOverflow(): FloatArray {
-        if (overflowSize == 0) return FloatArray(0)
-        val out = overflow.copyOf(overflowSize)
-        overflowSize = 0
-        return out
-    }
-
-    /** Drop all audio (including pending overflow) and restart the interval. */
-    fun reset() {
-        writeIndex = 0
-        filled = 0
-        sinceLastRedecode = 0
-        overflowSize = 0
-        ring.fill(0f)
-        overflow.fill(0f)
-    }
-}
@@ -1,208 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import kotlin.math.PI
-import kotlin.math.ceil
-import kotlin.math.cos
-import kotlin.math.floor
-import kotlin.math.ln1p
-import kotlin.math.roundToInt
-import kotlin.math.sqrt
-
-/**
- * Audio front-end for the DeepCW model: turns PCM samples into the
- * `[time, frequency]` log-magnitude spectrogram the network expects.
- *
- * Mirrors the upstream Python reference (deepcw-engine
- * `examples/python/decode_morse.py`) step for step:
- *
- *   resample -> 3200 Hz, reflect-pad by fft/2, periodic Hann window of 256,
- *   real FFT, keep bins [32, 97) i.e. 400-1200 Hz, then log1p.
- *
- * The model's fixed 400-1200 Hz window means pitch detection is built in —
- * no spectral peak tracking or squelch gating is needed on our side.
- */
-object CwDeepSpectrogram {
-
-    /** Model input sample rate, from `model.onnx.json`. */
-    const val SAMPLE_RATE = 3200
-
-    /** FFT window length in samples. */
-    const val FFT_LENGTH = 256
-
-    /** Hop between consecutive frames; 48/3200 = 15.0 ms per frame. */
-    const val HOP_LENGTH = 48
-
-    private const val MIN_FREQ_HZ = 400.0
-    private const val MAX_FREQ_HZ = 1200.0
-
-    /** Number of frequency bins the model expects. */
-    const val FREQUENCY_BINS = 65
-
-    /** Milliseconds of audio represented by one output frame. */
-    const val MS_PER_FRAME = 1000.0 * HOP_LENGTH / SAMPLE_RATE
-
-    private val hannWindow: FloatArray = FloatArray(FFT_LENGTH) { i ->
-        // numpy: np.hanning(N + 1)[:-1] — the periodic (not symmetric) variant.
-        (0.5 - 0.5 * cos(2.0 * PI * i / FFT_LENGTH)).toFloat()
-    }
-
-    /**
-     * Inclusive-exclusive bin range covering [minHz, maxHz].
-     * Returns `start to stop`, matching the reference's `frequency_bin_range`.
-     */
-    fun frequencyBinRange(
-        sampleRate: Int,
-        fftLength: Int,
-        minHz: Double,
-        maxHz: Double
-    ): Pair<Int, Int> {
-        val binHz = sampleRate.toDouble() / fftLength
-        val start = ceil(minHz / binHz).toInt()
-        val stop = floor(maxHz / binHz).toInt() + 1
-        return start to stop
-    }
-
-    /**
-     * Linear-interpolation resampler. Deliberately dependency-light and
-     * identical to the reference implementation so spectrograms match.
-     */
-    fun resampleLinear(audio: FloatArray, sourceRate: Int, targetRate: Int): FloatArray {
-        if (sourceRate == targetRate || audio.isEmpty()) return audio
-        val targetLength = (audio.size.toDouble() * targetRate / sourceRate).roundToInt()
-        val out = FloatArray(targetLength)
-        val ratio = sourceRate.toDouble() / targetRate
-        for (i in 0 until targetLength) {
-            val position = i * ratio
-            val left = floor(position).toInt()
-            val right = minOf(left + 1, audio.size - 1)
-            val fraction = (position - left).toFloat()
-            out[i] = audio[left] * (1f - fraction) + audio[right] * fraction
-        }
-        return out
-    }
-
-    /**
-     * Build the log-magnitude spectrogram. Input must already be at
-     * [SAMPLE_RATE]; use [resampleLinear] first when it is not.
-     *
-     * @return `[frames][FREQUENCY_BINS]` values, all non-negative.
-     */
-    fun compute(audio: FloatArray): Array<FloatArray> {
-        require(audio.size >= FFT_LENGTH) {
-            "audio is too short for fftLength=$FFT_LENGTH, got ${audio.size}"
-        }
-
-        val (startBin, stopBin) = frequencyBinRange(
-            SAMPLE_RATE, FFT_LENGTH, MIN_FREQ_HZ, MAX_FREQ_HZ
-        )
-        val bins = stopBin - startBin
-        require(bins == FREQUENCY_BINS) {
-            "expected $FREQUENCY_BINS bins, computed $bins"
-        }
-
-        val padded = reflectPad(audio, FFT_LENGTH / 2)
-        val frames = 1 + (padded.size - FFT_LENGTH) / HOP_LENGTH
-        val result = Array(frames) { FloatArray(bins) }
-
-        val real = FloatArray(FFT_LENGTH)
-        val imag = FloatArray(FFT_LENGTH)
-        for (frame in 0 until frames) {
-            val offset = frame * HOP_LENGTH
-            for (i in 0 until FFT_LENGTH) {
-                real[i] = padded[offset + i] * hannWindow[i]
-                imag[i] = 0f
-            }
-            fftInPlace(real, imag)
-            val row = result[frame]
-            for (bin in startBin until stopBin) {
-                val magnitude = sqrt(real[bin] * real[bin] + imag[bin] * imag[bin])
-                row[bin - startBin] = ln1p(magnitude.toDouble()).toFloat()
-            }
-        }
-        return result
-    }
-
-    /**
-     * numpy `mode="reflect"`: mirrors around the edge samples without
-     * repeating them, so [1,2,3] padded by 2 becomes [3,2,1,2,3,2,1].
-     */
-    private fun reflectPad(audio: FloatArray, pad: Int): FloatArray {
-        if (pad == 0) return audio
-        val out = FloatArray(audio.size + 2 * pad)
-        for (i in 0 until pad) out[i] = audio[pad - i]
-        audio.copyInto(out, pad)
-        val last = audio.size - 1
-        for (i in 0 until pad) out[pad + audio.size + i] = audio[last - 1 - i]
-        return out
-    }
-
-    /**
-     * Iterative radix-2 Cooley-Tukey FFT. [FFT_LENGTH] is a power of two, so
-     * no padding case is needed. Only the first half of the output is read by
-     * [compute], which is the real-input equivalent of numpy's `rfft`.
-     */
-    private fun fftInPlace(real: FloatArray, imag: FloatArray) {
-        val n = real.size
-
-        // Bit-reversal permutation.
-        var j = 0
-        for (i in 1 until n) {
-            var bit = n shr 1
-            while (j and bit != 0) {
-                j = j xor bit
-                bit = bit shr 1
-            }
-            j = j or bit
-            if (i < j) {
-                var tmp = real[i]; real[i] = real[j]; real[j] = tmp
-                tmp = imag[i]; imag[i] = imag[j]; imag[j] = tmp
-            }
-        }
-
-        var length = 2
-        while (length <= n) {
-            val angle = -2.0 * PI / length
-            val wReal = cos(angle).toFloat()
-            val wImag = kotlin.math.sin(angle).toFloat()
-            var i = 0
-            while (i < n) {
-                var curReal = 1f
-                var curImag = 0f
-                for (k in 0 until length / 2) {
-                    val evenReal = real[i + k]
-                    val evenImag = imag[i + k]
-                    val oddReal = real[i + k + length / 2]
-                    val oddImag = imag[i + k + length / 2]
-                    val mulReal = oddReal * curReal - oddImag * curImag
-                    val mulImag = oddReal * curImag + oddImag * curReal
-                    real[i + k] = evenReal + mulReal
-                    imag[i + k] = evenImag + mulImag
-                    real[i + k + length / 2] = evenReal - mulReal
-                    imag[i + k + length / 2] = evenImag - mulImag
-                    val nextReal = curReal * wReal - curImag * wImag
-                    curImag = curReal * wImag + curImag * wReal
-                    curReal = nextReal
-                }
-                i += length
-            }
-            length = length shl 1
-        }
-    }
-}
@@ -0,0 +1,102 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlin.math.PI
+import kotlin.math.cos
+import kotlin.math.sin
+import kotlin.math.sqrt
+
+/**
+ * DSP utilities for CW (Morse code) decoding.
+ * Pure Kotlin, no NDK required.
+ */
+internal object CwDsp {
+
+    /**
+     * Design a simple bandpass FIR filter coefficients using windowed sinc method.
+     * @param lowCutoff  lower cutoff frequency (Hz) as fraction of sampleRate
+     * @param highCutoff upper cutoff frequency (Hz) as fraction of sampleRate
+     * @param taps       filter length (must be odd)
+     */
+    fun bandpassFir(lowCutoff: Double, highCutoff: Double, taps: Int): FloatArray {
+        val n = if (taps % 2 == 0) taps + 1 else taps
+        val half = n / 2
+        val coeffs = FloatArray(n)
+        for (i in 0 until n) {
+            val idx = i - half
+            if (idx == 0) {
+                coeffs[i] = (2.0 * (highCutoff - lowCutoff)).toFloat()
+            } else {
+                val x = PI * idx
+                coeffs[i] = ((sin(2 * highCutoff * x) - sin(2 * lowCutoff * x)) / x).toFloat()
+            }
+            // Hamming window
+            coeffs[i] = (coeffs[i] * (0.54 - 0.46 * cos(2 * PI * i / (n - 1)))).toFloat()
+        }
+        // Normalize
+        val sum = coeffs.sum()
+        if (sum != 0f) for (i in 0 until n) coeffs[i] /= sum
+        return coeffs
+    }
+
+    /** Apply FIR filter to a buffer. */
+    fun applyFir(buffer: FloatArray, coeffs: FloatArray): FloatArray {
+        val out = FloatArray(buffer.size)
+        for (i in buffer.indices) {
+            var sum = 0f
+            for (j in coeffs.indices) {
+                val idx = i - j
+                if (idx >= 0) sum += buffer[idx] * coeffs[j]
+            }
+            out[i] = sum
+        }
+        return out
+    }
+
+    /** Simple envelope detector: abs + low-pass smoothing. */
+    fun envelope(signal: FloatArray, alpha: Float = 0.1f): FloatArray {
+        val env = FloatArray(signal.size)
+        var s = 0f
+        for (i in signal.indices) {
+            s = alpha * kotlin.math.abs(signal[i]) + (1 - alpha) * s
+            env[i] = s
+        }
+        return env
+    }
+
+    /** Estimate noise floor from envelope for adaptive thresholding. */
+    fun noiseFloor(env: FloatArray, fraction: Float = 0.3f): Float {
+        val sorted = env.sortedArray()
+        val median = sorted[sorted.size / 2]
+        return median + (sorted[sorted.size * 9 / 10] - median) * fraction
+    }
+
+    /** Simple Goertzel to detect a specific tone frequency. */
+    fun goertzel(buffer: FloatArray, targetFreq: Float, sampleRate: Int): Float {
+        val omega = 2.0 * PI * targetFreq / sampleRate
+        val coeff = 2.0 * cos(omega)
+        var s0 = 0.0; var s1 = 0.0; var s2 = 0.0
+        for (sample in buffer) {
+            s0 = sample.toDouble() + coeff * s1 - s2
+            s2 = s1; s1 = s0
+        }
+        val power = s2 * s2 + s1 * s1 - coeff * s1 * s2
+        return sqrt(kotlin.math.abs(power)).toFloat()
+    }
+}
@@ -0,0 +1,87 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlin.math.cos
+import kotlin.math.sqrt
+
+/**
+ * Radix-2 FFT for real-valued input.
+ * Produces magnitude spectrum for the first N/2+1 bins.
+ * Used by CwSpectrogram for time-frequency analysis.
+ */
+internal class CwFFT(private val n: Int) {
+    init {
+        require(n > 0 && n and (n - 1) == 0) { "FFT size must be power of 2, got $n" }
+    }
+
+    private val cosTable = FloatArray(n / 2)
+    private val sinTable = FloatArray(n / 2)
+
+    init {
+        for (i in 0 until n / 2) {
+            val angle = -2.0 * kotlin.math.PI * i / n
+            cosTable[i] = cos(angle).toFloat()
+            sinTable[i] = kotlin.math.sin(angle).toFloat()
+        }
+    }
+
+    /** Compute magnitude spectrum for real input. Returns array of size n/2+1. */
+    fun magnitudeSpectrum(input: FloatArray): FloatArray {
+        require(input.size == n) { "Input size must be $n, got ${input.size}" }
+
+        val real = input.copyOf()
+        val imag = FloatArray(n)
+
+        // Bit-reversal permutation
+        var j = 0
+        for (i in 1 until n) {
+            var bit = n shr 1
+            while (j and bit != 0) { j = j xor bit; bit = bit shr 1 }
+            j = j xor bit
+            if (i < j) {
+                var tmp = real[i]; real[i] = real[j]; real[j] = tmp
+            }
+        }
+
+        // Radix-2 Cooley-Tukey FFT
+        var len = 2
+        while (len <= n) {
+            val half = len / 2
+            val step = n / len
+            for (i in 0 until n step len) {
+                for (k in 0 until half) {
+                    val tReal = real[i + k + half] * cosTable[k * step] - imag[i + k + half] * sinTable[k * step]
+                    val tImag = real[i + k + half] * sinTable[k * step] + imag[i + k + half] * cosTable[k * step]
+                    real[i + k + half] = real[i + k] - tReal
+                    imag[i + k + half] = imag[i + k] - tImag
+                    real[i + k] += tReal
+                    imag[i + k] += tImag
+                }
+            }
+            len = len shl 1
+        }
+
+        // Magnitude spectrum (first N/2+1 bins)
+        val mag = FloatArray(n / 2 + 1)
+        for (i in 0..n / 2) {
+            mag[i] = sqrt(real[i] * real[i] + imag[i] * imag[i]) / n
+        }
+        return mag
+    }
+}
@@ -0,0 +1,139 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlin.math.PI
+import kotlin.math.abs
+import kotlin.math.cos
+import kotlin.math.sin
+
+/**
+ * FFT lowpass/bandpass filter with overlap-add, ported from fldigi
+ * fftfilt.cxx (fftfilt class). Used by the CW decoder for the
+ * matched receive filter.
+ */
+internal class CwFftFilt(f1: Double, f2: Double, len: Int) {
+    private val flen: Int
+    private val flen2: Int
+    private val fft: CwGfft
+    private val filter: Array<CwComplex>
+    private val timedata: Array<CwComplex>
+    private val freqdata: Array<CwComplex>
+    private val output: Array<CwComplex>
+    private val ovlbuf: Array<CwComplex>
+    private var inptr = 0
+    private var pass = 0
+
+    init {
+        flen = len
+        flen2 = flen shr 1
+        fft = CwGfft(flen)
+        filter = Array(flen) { CwComplex() }
+        timedata = Array(flen) { CwComplex() }
+        freqdata = Array(flen) { CwComplex() }
+        output = Array(flen) { CwComplex() }
+        ovlbuf = Array(flen2) { CwComplex() }
+        createFilter(f1, f2)
+    }
+
+    constructor(f: Double, len: Int) : this(0.0, f, len)
+
+    fun flushSize(): Int = flen - inptr
+
+    /**
+     * f1 < f2 ==> bandpass; f1 > f2 ==> band reject; f1 == 0 ==> lowpass; f2 == 0 ==> highpass.
+     */
+    private fun createFilter(f1: Double, f2: Double) {
+        for (i in 0 until flen) {
+            filter[i] = CwComplex()
+        }
+        val bLowpass = f2 != 0.0
+        val bHighpass = f1 != 0.0
+
+        for (i in 0 until flen2) {
+            var h = 0.0
+            if (bLowpass) h += fsinc(f2, i, flen2)
+            if (bHighpass) h -= fsinc(f1, i, flen2)
+            if (bHighpass && f2 < f1 && i == flen2 / 2) h += 1.0
+            filter[i] = CwComplex(h * blackman(i, flen2), 0.0)
+        }
+
+        // forward FFT of the impulse response
+        fft.forward(filter)
+
+        // normalize unity gain
+        var scale = 0.0
+        for (i in 0 until flen2) {
+            val mag = kotlin.math.sqrt(filter[i].re * filter[i].re + filter[i].im * filter[i].im)
+            if (mag > scale) scale = mag
+        }
+        if (scale != 0.0) {
+            for (i in 0 until flen) {
+                filter[i] = CwComplex(filter[i].re / scale, filter[i].im / scale)
+            }
+        }
+        pass = 1
+    }
+
+    fun createLpf(f: Double) = createFilter(0.0, f)
+
+    private fun fsinc(fc: Double, i: Int, len: Int): Double {
+        val mid = len / 2
+        return if (i == mid) 2.0 * fc
+        else sin(2.0 * PI * fc * (i - mid)) / (PI * (i - mid))
+    }
+
+    private fun blackman(i: Int, len: Int): Double =
+        0.42 - 0.50 * cos(2.0 * PI * i / len) + 0.08 * cos(4.0 * PI * i / len)
+
+    /**
+     * Feed one complex input sample. Returns output array + count when flen/2
+     * samples are ready, otherwise null.
+     */
+    fun run(input: CwComplex): Array<CwComplex>? {
+        timedata[inptr++] = input
+        if (inptr < flen2) return null
+        if (pass > 0) pass--
+
+        // copy to freq domain and FFT
+        for (i in 0 until flen) {
+            freqdata[i] = timedata[i]
+        }
+        fft.forward(freqdata)
+
+        // multiply by filter shape
+        for (i in 0 until flen) {
+            val f = filter[i]
+            val t = freqdata[i]
+            freqdata[i] = CwComplex(t.re * f.re - t.im * f.im, t.re * f.im + t.im * f.re)
+        }
+
+        // inverse FFT
+        fft.inverse(freqdata)
+
+        // overlap-add: first half is valid output, save second half
+        for (i in 0 until flen2) {
+            output[i] = CwComplex(ovlbuf[i].re + freqdata[i].re, ovlbuf[i].im + freqdata[i].im)
+            ovlbuf[i] = freqdata[i + flen2]
+        }
+
+        inptr = 0
+        if (pass > 0) return null
+        return output
+    }
+}
@@ -15,32 +15,34 @@
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
-package com.rtbishop.look4sat.core.data.cw
-
-import android.content.Context
-import android.util.Log
+package com.rtbishop.look4sat.core.domain.cw

 /**
- * Minimal crash-probe logger for diagnosing crashes that produce no Java
- * stack trace (native faults, low-memory kills). Each step appends one line
- * to `files/probe_cw.txt`; if the process dies mid-way the last line shows
- * exactly where. No adb or logcat required.
+ * First-order IIR filters.
+ * Ported from ggmorse/src/filter.h
 */
-internal object CwProbe {
+internal class CwFilter {
+    private var z1 = 0f

-    private var dir: java.io.File? = null
-
-    fun init(context: Context) {
-        dir = context.filesDir
+    companion object {
+        private const val PI_F = 3.141592653589793f
    }

-    fun step(label: String) {
-        val target = dir ?: return
-        runCatching {
-            val line = "${System.currentTimeMillis()} $label"
-            val file = java.io.File(target, "probe_cw.txt")
-            file.appendText("$line\n")
-            Log.i("CwProbe", line)
-        }
+    fun highPass(sample: Float, cutoffHz: Float, sampleRate: Float): Float {
+        val rc = 1.0f / (2f * PI_F * cutoffHz)
+        val dt = 1.0f / sampleRate
+        val alpha = dt / (rc + dt)
+        z1 = alpha * (z1 + sample - z1)
+        return sample - z1
    }
+
+    fun lowPass(sample: Float, cutoffHz: Float, sampleRate: Float): Float {
+        val rc = 1.0f / (2f * PI_F * cutoffHz)
+        val dt = 1.0f / sampleRate
+        val alpha = dt / (rc + dt)
+        z1 += alpha * (sample - z1)
+        return z1
+    }
+
+    fun reset() { z1 = 0f }
 }
@@ -0,0 +1,530 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlin.math.abs
+import kotlin.math.log10
+import kotlin.math.roundToInt
+
+/**
+ * CW decoder ported from fldigi (w1hkj/fldigi) cw.cxx — full receive
+ * chain: NCO down-conversion, FFT lowpass filter, decimation, AGC,
+ * hysteresis keying detection, element timing state machine, adaptive
+ * speed tracking, SOM codebook matching and morse table lookup.
+ *
+ * Drop-in replacement for the reverse-engineered Morse Expert decoder:
+ * same processBuffer(FloatArray) entry point, same StateFlow outputs.
+ */
+class CwFldigiDecoder(
+    val sampleRate: Int = CwFldigiConstants.CW_SAMPLERATE,
+    private val frequency: Double = 600.0,
+    private val useSom: Boolean = true,
+    private val initialWpm: Int = CwFldigiConstants.DEFAULT_SPEED
+) {
+    private companion object {
+        const val CW_DOT = '.'
+        const val CW_DASH = '-'
+        const val CW_RESET = 0
+        const val CW_KEYDOWN = 1
+        const val CW_KEYUP = 2
+        const val CW_QUERY = 3
+        const val CW_SUCCESS = 0
+        const val CW_ERROR = -1
+
+        // Auto-tune (spectral peak tracking, mirrors the old channelTracker)
+        const val TUNE_FFT_SIZE = 512
+        const val TUNE_MIN_FREQ = 300.0
+        const val TUNE_MAX_FREQ = 1500.0
+        const val TUNE_ENERGY_FRACTION = 0.35
+    }
+
+    private enum class CwRxState { IDLE, IN_TONE, AFTER_TONE }
+
+    // Outputs (API-compatible with the old CwDecoder)
+    private val _decodedTextFlow = MutableStateFlow("")
+    val decodedTextFlow: StateFlow<String> = _decodedTextFlow
+
+    private val _signalStrength = MutableStateFlow(0f)
+    val signalStrength: StateFlow<Float> = _signalStrength
+
+    private val _estimatedPitch = MutableStateFlow<Float?>(frequency.toFloat())
+    val estimatedPitch: StateFlow<Float?> = _estimatedPitch
+
+    private val _estimatedSpeed = MutableStateFlow<Float?>(null)
+    val estimatedSpeed: StateFlow<Float?> = _estimatedSpeed
+
+    // --- auto-tune state (spectral peak tracking) ---
+    private var tuneFreq = frequency
+    private val tuneBuffer = DoubleArray(TUNE_FFT_SIZE)
+    private var tuneIdx = 0
+    private var tuneFft = CwGfft(TUNE_FFT_SIZE)
+    private var tunePeakFreq = frequency
+    private var tuneHasPeak = false
+    private var tuneLocked = false
+    private val tuneWindow = DoubleArray(TUNE_FFT_SIZE)
+
+    // --- fldigi cw state ---
+    private var phaseacc = 0.0
+    private var FFTphase = 0.0
+    private var FFTvalue = 0.0
+    private var smpl_ctr = 0
+
+    private var agc_peak = 1.0
+    private var noise_floor = 1.0
+    private var sig_avg = 0.0
+    private var metric = 0.0
+    private var siglevel = 0.0
+
+    private var upper_threshold = CwFldigiConstants.CW_UPPER_THRESHOLD
+    private var lower_threshold = CwFldigiConstants.CW_LOWER_THRESHOLD
+
+    private val cw_FFT_filter: CwFftFilt
+    private val bitfilter: CwMovAvg
+    private val trackingfilter: CwMovAvg
+
+    private var cw_receive_state = CwRxState.IDLE
+    private var old_cw_receive_state = CwRxState.IDLE
+
+    private var cw_rr_start_timestamp = 0
+    private var cw_rr_end_timestamp = 0
+    private var rx_rep_buf = StringBuilder()
+    private var cw_ptr = 0
+    private val cw_buffer = FloatArray(CwFldigiConstants.MAX_MORSE_ELEMENTS + 1)
+
+    private var cw_speed = initialWpm
+    private var cw_send_speed = initialWpm
+    private var cw_receive_speed = initialWpm
+    private var cw_bandwidth = CwFldigiConstants.DEFAULT_BANDWIDTH
+    private var cwTrack = true
+    private var two_dots = 0L
+    private var last_element = 0
+    private var space_sent = true
+    private var cw_noise_spike_threshold = 0L
+    private var cw_receive_dot_length = 0L
+    private var cw_receive_dash_length = 0L
+
+    private var synchscope = 50
+
+    init {
+        val bw = cw_bandwidth.toDouble() / sampleRate
+        cw_FFT_filter = CwFftFilt(bw, CwFldigiConstants.CW_FFT_SIZE)
+        val bfv = (symbollen() / (2 * CwFldigiConstants.DEC_RATIO)).coerceAtLeast(1)
+        bitfilter = CwMovAvg(bfv)
+        trackingfilter = CwMovAvg(CwFldigiConstants.TRACKING_FILTER_SIZE)
+
+        two_dots = (2 * CwFldigiConstants.KWPM / cw_speed).toLong()
+        cw_noise_spike_threshold = two_dots / 4
+        cw_receive_dot_length = (CwFldigiConstants.KWPM / cw_receive_speed).toLong()
+        cw_receive_dash_length = 3 * cw_receive_dot_length
+    }
+
+    private fun symbollen(): Int =
+        (sampleRate * 1.2 / cw_speed).roundToInt()
+
+    private fun usecDiff(earlier: Int, later: Int): Int =
+        if (earlier >= later) 0 else later - earlier
+
+    /** Main entry: feed PCM samples. */
+    fun processBuffer(buffer: FloatArray) {
+        for (sample in buffer) {
+            feedTuner(sample.toDouble())
+            rxSample(sample.toDouble())
+        }
+    }
+
+    /**
+     * Spectral peak tracking (auto-tune). Collects raw samples, runs an FFT
+     * every TUNE_FFT_SIZE samples, finds the strongest peak in the CW range
+     * and smoothly steers tuneFreq toward it — mirroring the old
+     * channelTracker behaviour so off-tune signals still decode.
+     */
+    private fun feedTuner(sample: Double) {
+        tuneBuffer[tuneIdx++] = sample
+        if (tuneIdx < TUNE_FFT_SIZE) return
+        tuneIdx = 0
+
+        // Hann window
+        for (i in 0 until TUNE_FFT_SIZE) {
+            val w = 0.5 - 0.5 * kotlin.math.cos(2.0 * Math.PI * i / (TUNE_FFT_SIZE - 1))
+            tuneWindow[i] = tuneBuffer[i] * w
+        }
+        val data = Array(TUNE_FFT_SIZE) { CwComplex(tuneWindow[it], 0.0) }
+        tuneFft.forward(data)
+
+        // Find the strongest bin in the CW range (300..1500 Hz)
+        val binMin = (TUNE_MIN_FREQ * TUNE_FFT_SIZE / sampleRate).toInt()
+        val binMax = (TUNE_MAX_FREQ * TUNE_FFT_SIZE / sampleRate).toInt()
+        var bestBin = -1
+        var bestMag = 0.0
+        var totalMag = 0.0
+        for (b in binMin..binMax) {
+            val mag = data[b].abs()
+            totalMag += mag
+            if (mag > bestMag) {
+                bestMag = mag
+                bestBin = b
+            }
+        }
+        if (bestBin < 0) return
+        val meanMag = totalMag / (binMax - binMin + 1)
+        if (bestMag < meanMag * 2.0) return // no clear tone
+        // Absolute floor: silence or weak noise must not steer the NCO.
+        // A 0.6-amplitude tone in a 512-pt Hann FFT yields peak ≈ 150;
+        // anything below ~30 is noise/DC leakage.
+        if (bestMag < 30.0) return
+
+        val peakFreq = bestBin * sampleRate.toDouble() / TUNE_FFT_SIZE
+        tunePeakFreq = peakFreq
+        tuneHasPeak = true
+        _estimatedPitch.value = peakFreq.toFloat()
+
+        // Lock fast: a strong peak on the very first frame is reliable enough
+        // (CW tones are narrow and dominate the band). Steer immediately so
+        // the first character still decodes. Do NOT reset the RX state on the
+        // first lock — the AGC adapts in a few frames and a reset would wipe
+        // the element that triggered the tune.
+        if (!tuneLocked) {
+            tuneFreq = peakFreq
+            tuneLocked = true
+            _estimatedPitch.value = peakFreq.toFloat()
+        } else {
+            // Smooth tracking; retune instantly on big jumps (signal switched freq)
+            val diff = peakFreq - tuneFreq
+            if (kotlin.math.abs(diff) > 120.0) {
+                tuneFreq = peakFreq
+                resetRxState()
+            } else {
+                tuneFreq += diff * 0.2
+            }
+        }
+    }
+
+    /** Reset only the fldigi RX state machine (keep decoded text). */
+    private fun resetRxState() {
+        cw_receive_state = CwRxState.IDLE
+        old_cw_receive_state = CwRxState.IDLE
+        smpl_ctr = 0
+        cw_ptr = 0
+        rx_rep_buf.clear()
+        last_element = 0
+        space_sent = true
+        FFTphase = 0.0
+        phaseacc = 0.0
+    }
+
+    private fun rxSample(value: Double) {
+        // NCO down-conversion (fldigi rx_FFTprocess). tuneFreq tracks the
+        // strongest spectral peak so off-tune signals still decode.
+        val z = CwComplex(
+            value * kotlin.math.cos(FFTphase),
+            value * kotlin.math.sin(FFTphase)
+        )
+        FFTphase += 2.0 * Math.PI * tuneFreq / sampleRate
+        if (FFTphase > 2.0 * Math.PI) FFTphase -= 2.0 * Math.PI
+
+        val out = cw_FFT_filter.run(z) ?: return
+        for (i in 0 until CwFldigiConstants.CW_FFT_SIZE / 2) {
+            ++smpl_ctr
+            if (smpl_ctr % CwFldigiConstants.DEC_RATIO != 0) continue
+            FFTvalue = out[i].abs()
+            FFTvalue = bitfilter.run(FFTvalue)
+            decodeStream(FFTvalue)
+        }
+    }
+
+    /**
+     * AGC + hysteresis detection (fldigi cw::decode_stream).
+     */
+    private fun decodeStream(value: Double) {
+        var v = value
+        val attack: Int
+        val decay: Int
+        when (CwFldigiConstants.CWRX_ATTACK_DEFAULT) {
+            0 -> attack = 400
+            2 -> attack = 100
+            else -> attack = 200
+        }
+        when (CwFldigiConstants.CWRX_DECAY_DEFAULT) {
+            0 -> decay = 2000
+            2 -> decay = 500
+            else -> decay = 1000
+        }
+
+        sig_avg = decayAvg(sig_avg, v, decay)
+
+        if (v < sig_avg) {
+            noise_floor = if (v < noise_floor) decayAvg(noise_floor, v, attack)
+            else decayAvg(noise_floor, v, decay)
+        }
+        if (v > sig_avg) {
+            agc_peak = if (v > agc_peak) decayAvg(agc_peak, v, attack)
+            else decayAvg(agc_peak, v, decay)
+        }
+
+        val normNoise = noise_floor / agc_peak
+        val normSig = sig_avg / agc_peak
+        siglevel = normSig
+
+        if (agc_peak != 0.0) v /= agc_peak else v = 0.0
+
+        metric = 0.8 * metric
+        if ((noise_floor > 1e-4) && (noise_floor < sig_avg)) {
+            val db = 20.0 * log10(sig_avg / noise_floor)
+            metric += 0.2 * clamp(2.5 * db, 0.0, 100.0)
+        }
+
+        val diff = normSig - normNoise
+        upper_threshold = normSig - 0.2 * diff
+        lower_threshold = normNoise + 0.7 * diff
+
+        // Squelch gate (fldigi: !progStatus.sqlonoff || metric > sldrSquelchValue).
+        // Default sqlonoff=true, sldrSquelchValue=5.0. Without this gate, noise
+        // spikes false-trigger KEYDOWN and lock the state machine in IN_TONE.
+        if (sqlonoff && metric <= squelchValue) return
+
+        // Power detection using hysteresis
+        if ((v > upper_threshold) && (cw_receive_state != CwRxState.IN_TONE)) {
+            handleEvent(CW_KEYDOWN)
+        }
+        if ((v < lower_threshold) && (cw_receive_state == CwRxState.IN_TONE)) {
+            handleEvent(CW_KEYUP)
+        }
+
+        if (handleEvent(CW_QUERY) == CW_SUCCESS) {
+            synchscope = 100
+            // emit decoded char(s)
+        } else if (--synchscope == 0) {
+            synchscope = 25
+        }
+    }
+
+    private var sqlonoff = true
+    private var squelchValue = 5.0
+
+    private fun decayAvg(avg: Double, value: Double, timeConst: Int): Double =
+        avg + (value - avg) / timeConst
+
+    private fun clamp(v: Double, lo: Double, hi: Double): Double =
+        if (v < lo) lo else if (v > hi) hi else v
+
+    private fun handleEvent(event: Int): Int {
+        val sc = StringBuilder()
+        var elementUsec: Int
+        when (event) {
+            CW_RESET -> {
+                syncParameters()
+                cw_receive_state = CwRxState.IDLE
+                cw_ptr = 0
+                smpl_ctr = 0
+                rx_rep_buf.clear()
+            }
+            CW_KEYDOWN -> {
+                if (cw_receive_state == CwRxState.IN_TONE) return CW_ERROR
+                if (cw_receive_state == CwRxState.IDLE) {
+                    smpl_ctr = 0
+                    rx_rep_buf.clear()
+                    cw_ptr = 0
+                }
+                cw_rr_start_timestamp = smpl_ctr
+                old_cw_receive_state = cw_receive_state
+                cw_receive_state = CwRxState.IN_TONE
+                return CW_ERROR
+            }
+            CW_KEYUP -> {
+                if (cw_receive_state != CwRxState.IN_TONE) return CW_ERROR
+                cw_rr_end_timestamp = smpl_ctr
+                elementUsec = usecDiff(cw_rr_start_timestamp, cw_rr_end_timestamp)
+                syncParameters()
+                if (cw_noise_spike_threshold > 0 && elementUsec < cw_noise_spike_threshold) {
+                    cw_receive_state = CwRxState.IDLE
+                    return CW_ERROR
+                }
+
+                // adaptive speed tracking on dot-dash / dash-dot pairs
+                if (last_element > 0) {
+                    if ((elementUsec > 2 * last_element) && (elementUsec < 4 * last_element)) {
+                        updateTracking(last_element, elementUsec)
+                    }
+                    if ((last_element > 2 * elementUsec) && (last_element < 4 * elementUsec)) {
+                        updateTracking(elementUsec, last_element)
+                    }
+                }
+                last_element = elementUsec
+
+                if (elementUsec <= two_dots) {
+                    rx_rep_buf.append(CW_DOT)
+                    cw_buffer[cw_ptr++] = last_element.toFloat()
+                } else {
+                    rx_rep_buf.append(CW_DASH)
+                    cw_buffer[cw_ptr++] = last_element.toFloat()
+                }
+
+                if (rx_rep_buf.length > CwFldigiConstants.MAX_MORSE_ELEMENTS) {
+                    cw_receive_state = CwRxState.IDLE
+                    cw_ptr = 0
+                    smpl_ctr = 0
+                    return CW_ERROR
+                } else {
+                    if (cw_ptr < cw_buffer.size) cw_buffer[cw_ptr] = 0.0f
+                }
+                cw_receive_state = CwRxState.AFTER_TONE
+                return CW_ERROR
+            }
+            CW_QUERY -> {
+                if (cw_receive_state == CwRxState.IN_TONE) return CW_ERROR
+                syncParameters()
+                elementUsec = usecDiff(cw_rr_end_timestamp, smpl_ctr)
+                if (elementUsec < (2 * cw_receive_dot_length)) return CW_ERROR
+
+                if (elementUsec >= (2 * cw_receive_dot_length) &&
+                    elementUsec <= (4 * cw_receive_dot_length) &&
+                    cw_receive_state == CwRxState.AFTER_TONE
+                ) {
+                    val pattern = rx_rep_buf.toString()
+                    val decoded = if (useSom) {
+                        findWinner(cw_buffer, two_dots)
+                    } else {
+                        MorseTable.rxLookup(pattern)
+                    }
+                    if (decoded.isNotEmpty()) {
+                        appendDecoded(decoded)
+                    }
+                    rx_rep_buf.clear()
+                    cw_receive_state = CwRxState.IDLE
+                    space_sent = false
+                    cw_ptr = 0
+                    return CW_SUCCESS
+                }
+
+                if ((elementUsec > (4 * cw_receive_dot_length)) && !space_sent) {
+                    appendDecoded(" ")
+                    space_sent = true
+                    return CW_SUCCESS
+                }
+                return CW_ERROR
+            }
+        }
+        return CW_ERROR
+    }
+
+    private fun appendDecoded(text: String) {
+        val current = _decodedTextFlow.value
+        _decodedTextFlow.value = if (current.length > 2000) {
+            current.drop(current.length - 1500) + text
+        } else {
+            current + text
+        }
+        _signalStrength.value = metric.toFloat() / 100f
+        _estimatedSpeed.value = (CwFldigiConstants.KWPM.toDouble() / (two_dots / 2.0)).toFloat()
+    }
+
+    private fun syncParameters() {
+        if (cwTrack) {
+            cw_receive_speed = (CwFldigiConstants.KWPM / (two_dots / 2)).toInt()
+        } else {
+            cw_receive_speed = cw_send_speed
+            two_dots = 2 * (CwFldigiConstants.KWPM / cw_send_speed).toLong()
+        }
+
+        if (cw_receive_speed > 0) {
+            cw_receive_dot_length = (CwFldigiConstants.KWPM / cw_receive_speed).toLong()
+        } else {
+            cw_receive_dot_length = (CwFldigiConstants.KWPM / 5).toLong()
+        }
+        cw_receive_dash_length = 3 * cw_receive_dot_length
+        cw_noise_spike_threshold = cw_receive_dot_length / 2
+    }
+
+    private fun updateTracking(dur1: Int, dur2: Int) {
+        val minDot = CwFldigiConstants.KWPM / 200
+        val maxDash = 3 * CwFldigiConstants.KWPM / 5
+        if ((dur1 > dur2) && (dur1 > 4 * dur2)) return
+        if ((dur2 > dur1) && (dur2 > 4 * dur1)) return
+        if (dur1 < minDot || dur2 < minDot) return
+        if (dur2 > maxDash || dur2 > maxDash) return
+
+        two_dots = trackingfilter.run(((dur1 + dur2) / 2).toDouble()).toLong()
+        syncParameters()
+    }
+
+    /**
+     * SOM codebook matching (fldigi cw::find_winner + normalize).
+     */
+    private fun findWinner(inbuf: FloatArray, twodots: Long): String {
+        if (normalize(inbuf, twodots) == 0) return " "
+
+        var winner = -1
+        var bestDiff = Double.MAX_VALUE
+        for ((idx, entry) in SomTable.table.withIndex()) {
+            var difference = 0.0
+            for (i in 0 until CwFldigiConstants.WGT_SIZE) {
+                val diff = inbuf[i] - entry.weights[i]
+                difference += diff * diff
+                if (difference > bestDiff) break
+            }
+            if (difference < bestDiff) {
+                winner = idx
+                bestDiff = difference
+            }
+        }
+
+        if (winner >= 0 && SomTable.table[winner].pattern.isNotEmpty()) {
+            val sc = MorseTable.rxLookup(SomTable.table[winner].pattern)
+            return if (sc.isNotEmpty()) sc else CwFldigiConstants.DEFAULT_NOISE_CHAR.toString()
+        }
+        return CwFldigiConstants.DEFAULT_NOISE_CHAR.toString()
+    }
+
+    private fun normalize(v: FloatArray, twodots: Long): Int {
+        var max = v[0]
+        var min = v[0]
+        for (j in 1 until CwFldigiConstants.WGT_SIZE) {
+            if (v[j] > max) max = v[j]
+            else if (v[j] < min) min = v[j]
+        }
+        if (max == 0.0f) return 0
+
+        val ratio = if (max > twodots) 1.0f else 0.33f
+        val scale = ratio / max
+        for (j in 0 until CwFldigiConstants.WGT_SIZE) v[j] *= scale
+        return 1
+    }
+
+    /** Reset the decoder state (fldigi cw::rx_init + reset). */
+    fun resetDecoder() {
+        cw_receive_state = CwRxState.IDLE
+        smpl_ctr = 0
+        cw_ptr = 0
+        rx_rep_buf.clear()
+        last_element = 0
+        space_sent = true
+        _decodedTextFlow.value = ""
+        _signalStrength.value = 0f
+        _estimatedSpeed.value = null
+        FFTphase = 0.0
+        phaseacc = 0.0
+        // reset auto-tune
+        tuneIdx = 0
+        tunePeakFreq = frequency
+        tuneHasPeak = false
+        tuneLocked = false
+        tuneFreq = frequency
+    }
+}
@@ -0,0 +1,183 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Constants and primitives ported from fldigi (w1hkj/fldigi),
+ * GPL v3, cw.h / cw.cxx / filters.cxx / fftfilt.cxx.
+ *
+ * Faithful port: identifiers and formulas mirror the C++ original so
+ * behaviour matches the desktop decoder bit-for-bit.
+ */
+internal object CwFldigiConstants {
+    const val CW_SAMPLERATE = 8000
+    const val DEC_RATIO = 16
+    const val CW_FFT_SIZE = 2048 // must be power of 2
+    const val MAX_MORSE_ELEMENTS = 6
+    const val WGT_SIZE = 7
+    const val TRACKING_FILTER_SIZE = 16
+    const val MAX_PIPE_SIZE = (22 * CW_SAMPLERATE * 12 / 800)
+    const val CLRCOUNT = 16
+    const val CW_MAX_SPEED = 50
+    const val INITIAL_SEND_SPEED = 18
+    const val INITIAL_RECEIVE_SPEED = 18
+
+    /** # samples in a dot: KWPM / WPM. fldigi: KWPM = 12 * samplerate / 10 */
+    const val KWPM = 12 * CW_SAMPLERATE / 10
+
+    const val CW_SUCCESS = 0
+    const val CW_ERROR = -1
+
+    // Defaults mirroring fldigi progdefaults
+    const val DEFAULT_SPEED = 18 // WPM
+    const val DEFAULT_BANDWIDTH = 150 // Hz
+    const val DEFAULT_RANGE = 10 // WPM tracking range
+    const val LOWER_LIMIT = 5 // WPM
+    const val UPPER_LIMIT = 50 // WPM
+    const val DEFAULT_NOISE_CHAR = '*'
+    const val CWRX_ATTACK_DEFAULT = 1 // medium
+    const val CWRX_DECAY_DEFAULT = 1 // medium
+    const val CW_LOWER_THRESHOLD = 0.4
+    const val CW_UPPER_THRESHOLD = 0.6
+}
+
+/**
+ * Moving average filter, ported from fldigi Cmovavg (filters.cxx).
+ */
+internal class CwMovAvg(private var len: Int) {
+    private val buf = DoubleArray(MAX_MOVAVG)
+    private var out = 0.0
+    private var pint = 0
+    private var empty = true
+
+    fun run(a: Double): Double {
+        if (empty) {
+            empty = false
+            out = 0.0
+            for (i in 0 until len) {
+                buf[i] = a
+                out += a
+            }
+            pint = 0
+            return a
+        }
+        out = out - buf[pint] + a
+        buf[pint] = a
+        if (++pint >= len) pint = 0
+        return out / len
+    }
+
+    fun setLength(newLen: Int) {
+        len = newLen.coerceAtMost(MAX_MOVAVG).coerceAtLeast(1)
+        empty = true
+    }
+
+    fun reset() {
+        empty = true
+    }
+
+    fun value(): Double = if (len > 0) out / len else 0.0
+
+    private companion object {
+        const val MAX_MOVAVG = 2048
+    }
+}
+
+/**
+ * Complex sample used by the FFT filter chain.
+ */
+internal data class CwComplex(var re: Double = 0.0, var im: Double = 0.0) {
+    operator fun timesAssign(other: CwComplex) {
+        val r = re * other.re - im * other.im
+        val i = re * other.im + im * other.re
+        re = r; im = i
+    }
+
+    fun abs(): Double = kotlin.math.sqrt(re * re + im * im)
+}
+
+/**
+ * In-place radix-2 complex FFT, ported from fldigi gfft.h semantics
+ * (ComplexFFT / InverseComplexFFT, forward = -1).
+ */
+internal class CwGfft(private val n: Int) {
+    init {
+        require(n > 0 && n and (n - 1) == 0) { "FFT size must be power of 2, got $n" }
+    }
+
+    private val rev = IntArray(n)
+
+    init {
+        val log2n = Integer.numberOfTrailingZeros(n)
+        for (i in 0 until n) {
+            var r = 0
+            var x = i
+            for (bit in 0 until log2n) {
+                r = (r shl 1) or (x and 1)
+                x = x shr 1
+            }
+            rev[i] = r
+        }
+    }
+
+    /**
+     * In-place complex FFT.
+     * @param data array of CwComplex, size n
+     * @param inverse if true, performs inverse transform (no 1/n scaling; caller divides)
+     */
+    fun transform(data: Array<CwComplex>, inverse: Boolean) {
+        val sign = if (inverse) 1 else -1
+
+        // bit reversal permutation
+        for (i in 0 until n) {
+            val j = rev[i]
+            if (j > i) {
+                val t = data[i]; data[i] = data[j]; data[j] = t
+            }
+        }
+
+        var len = 2
+        while (len <= n) {
+            val ang = sign * 2.0 * Math.PI / len
+            val wRe = Math.cos(ang)
+            val wIm = Math.sin(ang)
+            var i = 0
+            while (i < n) {
+                var curRe = 1.0
+                var curIm = 0.0
+                for (j in 0 until len / 2) {
+                    val u = data[i + j]
+                    val v = data[i + j + len / 2]
+                    val tRe = curRe * v.re - curIm * v.im
+                    val tIm = curRe * v.im + curIm * v.re
+                    data[i + j] = CwComplex(u.re + tRe, u.im + tIm)
+                    data[i + j + len / 2] = CwComplex(u.re - tRe, u.im - tIm)
+                    val nRe = curRe * wRe - curIm * wIm
+                    val nIm = curRe * wIm + curIm * wRe
+                    curRe = nRe; curIm = nIm
+                }
+                i += len
+            }
+            len = len shl 1
+        }
+    }
+
+    fun forward(data: Array<CwComplex>) = transform(data, false)
+
+    fun inverse(data: Array<CwComplex>) = transform(data, true)
+}
@@ -0,0 +1,54 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlin.math.cos
+import kotlin.math.sqrt
+
+/**
+ * Running Goertzel filter for CW tone detection.
+ * Tracks a specific frequency over time with a sliding window.
+ * Ported from ggmorse/src/goertzel.h
+ */
+internal class CwGoertzel {
+    private var s1 = 0.0
+    private var s2 = 0.0
+    private var coeff = 0.0
+
+    fun init(sampleRate: Float, targetFreq: Float) {
+        val omega = 2.0 * kotlin.math.PI * targetFreq / sampleRate
+        coeff = 2.0 * cos(omega)
+        s1 = 0.0
+        s2 = 0.0
+    }
+
+    fun process(sample: Float) {
+        val s0 = sample.toDouble() + coeff * s1 - s2
+        s2 = s1
+        s1 = s0
+    }
+
+    fun getPower(): Float {
+        return sqrt(s2 * s2 + s1 * s1 - coeff * s1 * s2).toFloat()
+    }
+
+    fun reset() {
+        s1 = 0.0
+        s2 = 0.0
+    }
+}
@@ -0,0 +1,53 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Simple linear resampler.
+ * Downsamples from input sample rate to output sample rate.
+ * Ported from ggmorse/src/resampler.h
+ */
+internal class CwResampler(private val inputRate: Float, private val outputRate: Float) {
+    private val ratio = inputRate / outputRate
+    private var lastSample = 0f
+
+    fun process(input: FloatArray): FloatArray {
+        if (ratio <= 0f || input.isEmpty()) return input
+        val outputLen = (input.size / ratio).toInt() + 1
+        val output = FloatArray(outputLen)
+        var idx = 0f
+        for (i in output.indices) {
+            val intIdx = idx.toInt()
+            val frac = idx - intIdx
+            if (intIdx + 1 < input.size) {
+                output[i] = input[intIdx] * (1 - frac) + input[intIdx + 1] * frac
+            } else if (intIdx < input.size) {
+                output[i] = input[intIdx] * (1 - frac) + lastSample * frac
+            } else {
+                output[i] = lastSample
+            }
+            idx += ratio
+        }
+        lastSample = input.lastOrNull() ?: lastSample
+        return output
+    }
+
+    fun reset() {
+        lastSample = 0f
+    }
+}
@@ -0,0 +1,61 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import kotlin.math.cos
+import kotlin.math.sin
+import kotlin.math.sqrt
+
+/**
+ * Lightweight pitch detector using DFT at specific frequency bins.
+ * Only scans [200, 1200] Hz in configurable steps — much faster than full FFT.
+ * Ported from ggmorse/src/stfft.h (simplified for CW use case).
+ */
+internal class CwPitchDetector(
+    private val sampleRate: Float,
+    private val minFreq: Float = 200f,
+    private val maxFreq: Float = 1200f,
+    private val stepHz: Float = 10f
+) {
+    /**
+     * Find the dominant pitch frequency in the buffer.
+     * Returns null if no significant pitch found.
+     */
+    fun findPitch(buffer: FloatArray): Float? {
+        if (buffer.isEmpty()) return null
+        var bestFreq = 0f
+        var bestPower = 0f
+        var freq = minFreq
+        while (freq <= maxFreq) {
+            var real = 0.0
+            var imag = 0.0
+            val omega = 2.0 * kotlin.math.PI * freq / sampleRate
+            for (i in buffer.indices) {
+                real += buffer[i] * cos(omega * i)
+                imag += buffer[i] * -sin(omega * i)
+            }
+            val power = (real * real + imag * imag).toFloat()
+            if (power > bestPower) {
+                bestPower = power
+                bestFreq = freq
+            }
+            freq += stepHz
+        }
+        return if (bestPower > 0.001f) bestFreq else null
+    }
+}
@@ -0,0 +1,170 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Sliding-window spectrogram for CW decoding.
+ * Maintains a time-frequency matrix updated with each audio frame.
+ *
+ * FFT size: 256, hop size: 64, sample rate: 4000 (or native)
+ * Frequency bins: 6..38 (187-1187 Hz, covers typical CW range)
+ * History: 40 columns (320 ms window)
+ * Time resolution: 64/4000 = 16 ms, Frequency resolution: 4000/256 = 15.625 Hz
+ */
+internal class CwSpectrogram(
+    private val fftSize: Int = 256,
+    private val hopSize: Int = 64,
+    private val sampleRate: Int = 4000,
+    private val minBin: Int = 6,
+    private val maxBin: Int = 38,
+    val historyCols: Int = 40
+) {
+    private val fft = CwFFT(fftSize)
+    val numBins: Int get() = maxBin - minBin + 1
+
+    // Hanning window
+    private val hanning = FloatArray(fftSize) {
+        (0.5 - 0.5 * kotlin.math.cos(2.0 * kotlin.math.PI * it / (fftSize - 1))).toFloat()
+    }
+
+    // Spectrogram data: [timeCol][freqBin]
+    private val spectrogram = Array(historyCols) { FloatArray(numBins) }
+    private var currentCol = 0
+    private var samplesBuffered = 0
+    private val buffer = FloatArray(fftSize)
+
+    // Per-bin running energy for normalization
+    private val binEnergy = FloatArray(numBins) { 1f }
+    private val alpha = 0.95f
+
+    // Counter for new columns generated since last check
+    private var newColumnCount = 0
+
+    /** Add audio samples, compute FFTs for each complete hop. */
+    fun addSamples(samples: FloatArray) {
+        var offset = 0
+        while (offset < samples.size) {
+            val needed = fftSize - samplesBuffered
+            val copyLen = minOf(needed, samples.size - offset)
+            System.arraycopy(samples, offset, buffer, samplesBuffered, copyLen)
+            samplesBuffered += copyLen
+            offset += copyLen
+
+            if (samplesBuffered >= fftSize) {
+                processFrame()
+                newColumnCount++
+                // Shift buffer: keep last (fftSize - hopSize) samples
+                System.arraycopy(buffer, hopSize, buffer, 0, fftSize - hopSize)
+                samplesBuffered = fftSize - hopSize
+            }
+        }
+    }
+
+    /** Get number of new columns generated since the last call to this method. */
+    fun getNewColumns(): Int {
+        val count = newColumnCount
+        newColumnCount = 0
+        return count
+    }
+
+    private fun processFrame() {
+        // Apply Hanning window
+        val windowed = FloatArray(fftSize) { buffer[it] * hanning[it] }
+
+        // Compute FFT magnitude spectrum
+        val mag = fft.magnitudeSpectrum(windowed)
+
+        // Update spectrogram column
+        val col = spectrogram[currentCol]
+        for (b in 0 until numBins) {
+            val binIdx = minBin + b
+            val rawMag = mag[binIdx]
+            // Running energy normalization
+            binEnergy[b] = alpha * binEnergy[b] + (1 - alpha) * rawMag
+            col[b] = if (binEnergy[b] > 1e-6f) rawMag / binEnergy[b] else 0f
+        }
+
+        currentCol = (currentCol + 1) % historyCols
+    }
+
+    /** Get the current spectrogram as a 2D array in chronological order. */
+    fun getSpectrogram(): Array<FloatArray> {
+        val result = Array(historyCols) { i ->
+            val srcIdx = (currentCol + i) % historyCols
+            spectrogram[srcIdx].copyOf()
+        }
+        return result
+    }
+
+    /** Get the most recent column (current energy across all frequencies). */
+    fun getCurrentColumn(): FloatArray {
+        val prevCol = (currentCol - 1 + historyCols) % historyCols
+        return spectrogram[prevCol].copyOf()
+    }
+
+    /** Get a column by index from the history (0 = oldest, historyCols-1 = newest). */
+    fun getColumn(index: Int): FloatArray {
+        val clamped = index.coerceIn(0, historyCols - 1)
+        val srcIdx = (currentCol - historyCols + clamped + historyCols) % historyCols
+        return spectrogram[srcIdx].copyOf()
+    }
+
+    /** Find the frequency bin with peak energy. Returns -1 if no significant signal. */
+    fun findPeakBin(): Int {
+        val col = getCurrentColumn()
+        var maxBin = -1
+        var maxVal = 0f
+        for (i in col.indices) {
+            if (col[i] > maxVal) {
+                maxVal = col[i]
+                maxBin = i
+            }
+        }
+        return if (maxVal > 0.3f) maxBin else -1
+    }
+
+    /** Get energy at a specific bin over the last N columns in chronological order. */
+    fun getBinEnergy(bin: Int, numCols: Int): FloatArray {
+        val clamped = minOf(numCols, historyCols)
+        val result = FloatArray(clamped)
+        for (i in 0 until clamped) {
+            val colIdx = (currentCol - clamped + i + historyCols) % historyCols
+            result[i] = spectrogram[colIdx][bin]
+        }
+        return result
+    }
+
+    /** Get the bin index for a frequency in Hz. */
+    fun freqToBin(freqHz: Float): Int {
+        val bin = (freqHz * fftSize / sampleRate).toInt()
+        return (bin - minBin).coerceIn(0, numBins - 1)
+    }
+
+    /** Get the center frequency for a bin. */
+    fun binToFreq(bin: Int): Float {
+        return (minBin + bin).toFloat() * sampleRate / fftSize
+    }
+
+    fun reset() {
+        for (col in spectrogram) col.fill(0f)
+        currentCol = 0
+        samplesBuffered = 0
+        buffer.fill(0f)
+        binEnergy.fill(1f)
+    }
+}
@@ -1,66 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import kotlinx.coroutines.flow.StateFlow
-
-/**
- * A CW (Morse code) decoder fed with microphone PCM.
- *
- * Implementations live outside `core:domain` when they need platform APIs;
- * this contract stays pure Kotlin so the UI can depend on it directly.
- */
-interface ICwDecoder {
-
-    /**
-     * Decoded text for the *current* window.
-     *
-     * Note this is **replace** semantics, not append: a whole-segment model
-     * revises earlier characters as more audio arrives, so consumers must show
-     * the current value rather than accumulating emissions.
-     */
-    val decodedText: StateFlow<String>
-
-    /**
-     * Permanent transcript of everything that has scrolled out of the live
-     * window. Unlike [decodedText] this only ever grows (until [reset]); it is
-     * what the user reads back after a signal has passed.
-     */
-    val historyText: StateFlow<String>
-
-    /** Detected tone frequency in Hz, or null before a tone is found. */
-    val estimatedPitch: StateFlow<Float?>
-
-    /** Relative signal strength in 0..1 for level meters. */
-    val signalStrength: StateFlow<Float>
-
-    /** Most recent inference duration in milliseconds, for diagnostics. */
-    val lastInferenceMs: StateFlow<Int>
-
-    /** Non-null when the decoder cannot run, for example the model failed to load. */
-    val errorMessage: StateFlow<String?>
-
-    /** Feed captured mono PCM in -1..1. Safe to call from a capture thread. */
-    suspend fun processBuffer(samples: FloatArray, sampleRate: Int)
-
-    /** Clear decoded text and buffered audio. */
-    fun reset()
-
-    /** Release native resources. Must be called when the decoder goes away. */
-    fun close()
-}
@@ -0,0 +1,140 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Morse code lookup table, ported from fldigi morse.cxx (cMorse::cw_table).
+ * Each entry: [enabled, displayChar, prosignDisplay, dotDashPattern].
+ */
+internal object MorseTable {
+
+    private data class Entry(
+        val enabled: Boolean,
+        val chr: String,
+        val prt: String,
+        val rpr: String
+    )
+
+    private val table = listOf(
+        // Prosigns
+        Entry(true, "=", "<BT>", "-...-"),
+        Entry(false, "~", "<AA>", ".-.-"),
+        Entry(true, "<", "<AS>", ".-..."),
+        Entry(true, ">", "<AR>", ".-.-."),
+        Entry(true, "%", "<SK>", "...-.-"),
+        Entry(true, "+", "<KN>", "-.--."),
+        Entry(true, "&", "<INT>", "..-.-"),
+        Entry(true, "{", "<HM>", "....--"),
+        Entry(true, "}", "<VE>", "...-."),
+        // ASCII 7-bit letters
+        Entry(true, "A", "A", ".-"),
+        Entry(true, "B", "B", "-..."),
+        Entry(true, "C", "C", "-.-."),
+        Entry(true, "D", "D", "-.."),
+        Entry(true, "E", "E", "."),
+        Entry(true, "F", "F", "..-."),
+        Entry(true, "G", "G", "--."),
+        Entry(true, "H", "H", "...."),
+        Entry(true, "I", "I", ".."),
+        Entry(true, "J", "J", ".---"),
+        Entry(true, "K", "K", "-.-"),
+        Entry(true, "L", "L", ".-.."),
+        Entry(true, "M", "M", "--"),
+        Entry(true, "N", "N", "-."),
+        Entry(true, "O", "O", "---"),
+        Entry(true, "P", "P", ".--."),
+        Entry(true, "Q", "Q", "--.-"),
+        Entry(true, "R", "R", ".-."),
+        Entry(true, "S", "S", "..."),
+        Entry(true, "T", "T", "-"),
+        Entry(true, "U", "U", "..-"),
+        Entry(true, "V", "V", "...-"),
+        Entry(true, "W", "W", ".--"),
+        Entry(true, "X", "X", "-..-"),
+        Entry(true, "Y", "Y", "-.--"),
+        Entry(true, "Z", "Z", "--.."),
+        // lowercase map to uppercase
+        Entry(true, "a", "A", ".-"), Entry(true, "b", "B", "-..."),
+        Entry(true, "c", "C", "-.-."), Entry(true, "d", "D", "-.."),
+        Entry(true, "e", "E", "."), Entry(true, "f", "F", "..-."),
+        Entry(true, "g", "G", "--."), Entry(true, "h", "H", "...."),
+        Entry(true, "i", "I", ".."), Entry(true, "j", "J", ".---"),
+        Entry(true, "k", "K", "-.-"), Entry(true, "l", "L", ".-.."),
+        Entry(true, "m", "M", "--"), Entry(true, "n", "N", "-."),
+        Entry(true, "o", "O", "---"), Entry(true, "p", "P", ".--."),
+        Entry(true, "q", "Q", "--.-"), Entry(true, "r", "R", ".-."),
+        Entry(true, "s", "S", "..."), Entry(true, "t", "T", "-"),
+        Entry(true, "u", "U", "..-"), Entry(true, "v", "V", "...-"),
+        Entry(true, "w", "W", ".--"), Entry(true, "x", "X", "-..-"),
+        Entry(true, "y", "Y", "-.--"), Entry(true, "z", "Z", "--.."),
+        // Numerals
+        Entry(true, "0", "0", "-----"),
+        Entry(true, "1", "1", ".----"),
+        Entry(true, "2", "2", "..---"),
+        Entry(true, "3", "3", "...--"),
+        Entry(true, "4", "4", "....-"),
+        Entry(true, "5", "5", "....."),
+        Entry(true, "6", "6", "-...."),
+        Entry(true, "7", "7", "--..."),
+        Entry(true, "8", "8", "---.."),
+        Entry(true, "9", "9", "----."),
+        // Punctuation
+        Entry(true, "\\", "\\", ".-..-."),
+        Entry(true, "'", "'", ".----."),
+        Entry(true, "$", "$", "...-..-"),
+        Entry(true, "(", "(", "-.--."),
+        Entry(true, ")", ")", "-.--.-"),
+        Entry(true, ",", ",", "--..--"),
+        Entry(true, "-", "-", "-....-"),
+        Entry(true, ".", ".", ".-.-.-"),
+        Entry(true, "/", "/", "-..-."),
+        Entry(true, ":", ":", "---..."),
+        Entry(true, ";", ";", "-.-.-."),
+        Entry(true, "?", "?", "..--.."),
+        Entry(true, "_", "_", "..--.-"),
+        Entry(true, "@", "@", ".--.-."),
+        Entry(true, "!", "!", "-.-.--"),
+        // Accented (disabled by default in fldigi)
+        Entry(false, "Ä", "Ä", ".-.-"), Entry(false, "ä", "Ä", ".-.-"),
+        Entry(false, "Æ", "Æ", ".-.-"), Entry(false, "æ", "Æ", ".-.-"),
+        Entry(false, "Å", "Å", ".--.-"), Entry(false, "å", "Å", ".--.-"),
+        Entry(false, "Ç", "Ç", "-.-.."), Entry(false, "ç", "Ç", "-.-.."),
+        Entry(false, "È", "È", ".-..-"), Entry(false, "è", "È", ".-..-"),
+        Entry(false, "É", "É", "..-.."), Entry(false, "é", "É", "..-.."),
+        Entry(false, "Ó", "Ó", "---."), Entry(false, "ó", "Ó", "---."),
+        Entry(false, "Ö", "Ö", "---."), Entry(false, "ö", "Ö", "---."),
+        Entry(false, "Ø", "Ø", "---."), Entry(false, "ø", "Ø", "---."),
+        Entry(false, "Ñ", "Ñ", "--.--"), Entry(false, "ñ", "Ñ", "--.--"),
+        Entry(false, "Ü", "Ü", "..--"), Entry(false, "ü", "Ü", "..--"),
+        Entry(false, "Û", "Û", "..--"), Entry(false, "û", "Û", "..--")
+    )
+
+    /**
+     * Look up the display representation of a dot-dash pattern.
+     * Returns "" when the pattern is not in the table or is disabled.
+     * Mirror of cMorse::rx_lookup.
+     */
+    fun rxLookup(pattern: String): String {
+        for (e in table) {
+            if (pattern == e.rpr) {
+                if (e.enabled) return e.prt
+            }
+        }
+        return ""
+    }
+}
@@ -0,0 +1,104 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+/**
+ * Self-Organizing Map codebook for CW character matching, ported from
+ * fldigi cw.cxx (cw::som_table). Each row is a dot/dash weight vector
+ * (0 = element absent, 0.33 = dot, 1.0 = dash).
+ */
+internal object SomTable {
+
+    data class SomEntry(val pattern: String, val weights: FloatArray)
+
+    val table: List<SomEntry> = listOf(
+        // Prosigns
+        SomEntry("-...-", floatArrayOf(1.0f, 0.33f, 0.33f, 0.33f, 1.0f, 0f, 0f)),
+        SomEntry(".-.-", floatArrayOf(0.33f, 1.0f, 0.33f, 1.0f, 0f, 0f, 0f)),
+        SomEntry(".-...", floatArrayOf(0.33f, 1.0f, 0.33f, 0.33f, 0.33f, 0f, 0f)),
+        SomEntry(".-.-.", floatArrayOf(0.33f, 1.0f, 0.33f, 1.0f, 0.33f, 0f, 0f)),
+        SomEntry("...-.-", floatArrayOf(0.33f, 0.33f, 0.33f, 1.0f, 0.33f, 1.0f, 0f)),
+        SomEntry("-.--.", floatArrayOf(1.0f, 0.33f, 1.0f, 1.0f, 0.33f, 0f, 0f)),
+        SomEntry("..-.-", floatArrayOf(0.33f, 0.33f, 1.0f, 0.33f, 1.0f, 0f, 0f)),
+        SomEntry("....--", floatArrayOf(0.33f, 0.33f, 0.33f, 0.33f, 1.0f, 1.0f, 0f)),
+        SomEntry("...-.", floatArrayOf(0.33f, 0.33f, 0.33f, 1.0f, 0.33f, 0f, 0f)),
+        // ASCII 7-bit letters
+        SomEntry(".-", floatArrayOf(0.33f, 1.0f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry("-...", floatArrayOf(1.0f, 0.33f, 0.33f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("-.-.", floatArrayOf(1.0f, 0.33f, 1.0f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("-..", floatArrayOf(1.0f, 0.33f, 0.33f, 0f, 0f, 0f, 0f)),
+        SomEntry(".", floatArrayOf(0.33f, 0f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry("..-.", floatArrayOf(0.33f, 0.33f, 1.0f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("--.", floatArrayOf(1.0f, 1.0f, 0.33f, 0f, 0f, 0f, 0f)),
+        SomEntry("....", floatArrayOf(0.33f, 0.33f, 0.33f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("..", floatArrayOf(0.33f, 0.33f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry(".---", floatArrayOf(0.33f, 1.0f, 1.0f, 1.0f, 0f, 0f, 0f)),
+        SomEntry("-.-", floatArrayOf(1.0f, 0.33f, 1.0f, 0f, 0f, 0f, 0f)),
+        SomEntry(".-..", floatArrayOf(0.33f, 1.0f, 0.33f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("--", floatArrayOf(1.0f, 1.0f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry("-.", floatArrayOf(1.0f, 0.33f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry("---", floatArrayOf(1.0f, 1.0f, 1.0f, 0f, 0f, 0f, 0f)),
+        SomEntry(".--.", floatArrayOf(0.33f, 1.0f, 1.0f, 0.33f, 0f, 0f, 0f)),
+        SomEntry("--.-", floatArrayOf(1.0f, 1.0f, 0.33f, 1.0f, 0f, 0f, 0f)),
+        SomEntry(".-.", floatArrayOf(0.33f, 1.0f, 0.33f, 0f, 0f, 0f, 0f)),
+        SomEntry("...", floatArrayOf(0.33f, 0.33f, 0.33f, 0f, 0f, 0f, 0f)),
+        SomEntry("-", floatArrayOf(1.0f, 0f, 0f, 0f, 0f, 0f, 0f)),
+        SomEntry("..-", floatArrayOf(0.33f, 0.33f, 1.0f, 0f, 0f, 0f, 0f)),
+        SomEntry("...-", floatArrayOf(0.33f, 0.33f, 0.33f, 1.0f, 0f, 0f, 0f)),
+        SomEntry(".--", floatArrayOf(0.33f, 1.0f, 1.0f, 0f, 0f, 0f, 0f)),
+        SomEntry("-..-", floatArrayOf(1.0f, 0.33f, 0.33f, 1.0f, 0f, 0f, 0f)),
+        SomEntry("-.--", floatArrayOf(1.0f, 0.33f, 1.0f, 1.0f, 0f, 0f, 0f)),
+        SomEntry("--..", floatArrayOf(1.0f, 1.0f, 0.33f, 0.33f, 0f, 0f, 0f)),
+        // Numerals
+        SomEntry("-----", floatArrayOf(1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0f, 0f)),
+        SomEntry(".----", floatArrayOf(0.33f, 1.0f, 1.0f, 1.0f, 1.0f, 0f, 0f)),
+        SomEntry("..---", floatArrayOf(0.33f, 0.33f, 1.0f, 1.0f, 1.0f, 0f, 0f)),
+        SomEntry("...--", floatArrayOf(0.33f, 0.33f, 0.33f, 1.0f, 1.0f, 0f, 0f)),
+        SomEntry("....-", floatArrayOf(0.33f, 0.33f, 0.33f, 0.33f, 1.0f, 0f, 0f)),
+        SomEntry(".....", floatArrayOf(0.33f, 0.33f, 0.33f, 0.33f, 0.33f, 0f, 0f)),
+        SomEntry("-....", floatArrayOf(1.0f, 0.33f, 0.33f, 0.33f, 0.33f, 0f, 0f)),
+        SomEntry("--...", floatArrayOf(1.0f, 1.0f, 0.33f, 0.33f, 0.33f, 0f, 0f)),
+        SomEntry("---..", floatArrayOf(1.0f, 1.0f, 1.0f, 0.33f, 0.33f, 0f, 0f)),
+        SomEntry("----.", floatArrayOf(1.0f, 1.0f, 1.0f, 1.0f, 0.33f, 0f, 0f)),
+        // Punctuation
+        SomEntry(".-..-.", floatArrayOf(0.33f, 1.0f, 0.33f, 0.33f, 1.0f, 0.33f, 0f)),
+        SomEntry(".----.", floatArrayOf(0.33f, 1.0f, 1.0f, 1.0f, 1.0f, 0.33f, 0f)),
+        SomEntry("...-..-", floatArrayOf(0.33f, 0.33f, 0.33f, 1.0f, 0.33f, 0.33f, 1.0f)),
+        SomEntry("-.---.", floatArrayOf(1.0f, 0.33f, 1.0f, 1.0f, 0.33f, 0f, 0f)),
+        SomEntry("-.--.-", floatArrayOf(1.0f, 0.33f, 1.0f, 1.0f, 0.33f, 1.0f, 0f)),
+        SomEntry("--..--", floatArrayOf(1.0f, 1.0f, 0.33f, 0.33f, 1.0f, 1.0f, 0f)),
+        SomEntry("-....-", floatArrayOf(1.0f, 0.33f, 0.33f, 0.33f, 0.33f, 1.0f, 0f)),
+        SomEntry(".-.-.-", floatArrayOf(0.33f, 1.0f, 0.33f, 1.0f, 0.33f, 1.0f, 0f)),
+        SomEntry("-..-.", floatArrayOf(1.0f, 0.33f, 0.33f, 1.0f, 0.33f, 0f, 0f)),
+        SomEntry("---...", floatArrayOf(1.0f, 1.0f, 1.0f, 0.33f, 0.33f, 0.33f, 0f)),
+        SomEntry("-.-.-.", floatArrayOf(1.0f, 0.33f, 1.0f, 0.33f, 1.0f, 0.33f, 0f)),
+        SomEntry("..--..", floatArrayOf(0.33f, 0.33f, 1.0f, 1.0f, 0.33f, 0.33f, 0f)),
+        SomEntry("..--.-", floatArrayOf(0.33f, 0.33f, 1.0f, 1.0f, 0.33f, 1.0f, 0f)),
+        SomEntry(".--.-.", floatArrayOf(0.33f, 1.0f, 1.0f, 0.33f, 1.0f, 0.33f, 0f)),
+        SomEntry("-.-.--", floatArrayOf(1.0f, 0.33f, 1.0f, 0.33f, 1.0f, 1.0f, 0f)),
+        // Accented
+        SomEntry(".-.-", floatArrayOf(0.33f, 1.0f, 0.33f, 1.0f, 0f, 0f, 0f)), // A umlaut, A aelig
+        SomEntry(".--.-", floatArrayOf(0.33f, 1.0f, 1.0f, 0.33f, 1.0f, 0f, 0f)), // A ring
+        SomEntry("-.-..", floatArrayOf(1.0f, 0.33f, 1.0f, 0.33f, 0.33f, 0f, 0f)), // C cedilla
+        SomEntry(".-..-", floatArrayOf(0.33f, 1.0f, 0.33f, 0.33f, 1.0f, 0f, 0f)), // E grave
+        SomEntry("..-..", floatArrayOf(0.33f, 0.33f, 1.0f, 0.33f, 0.33f, 0f, 0f)), // E acute
+        SomEntry("---.", floatArrayOf(1.0f, 1.0f, 1.0f, 0.33f, 0f, 0f, 0f)), // O acute, O umlaut, O slash
+        SomEntry("--.--", floatArrayOf(1.0f, 1.0f, 0.33f, 1.0f, 1.0f, 0f, 0f)), // N tilde
+        SomEntry("..--", floatArrayOf(0.33f, 0.33f, 1.0f, 1.0f, 0f, 0f, 0f)) // U umlaut, U circ
+    )
+}
@@ -42,7 +42,6 @@ interface IMainContainer {
    fun provideTxRadioController(): IRadioController
    fun provideRxRadioController(): IRadioController
    fun provideAudioCapture(): IAudioCapture
-    fun provideCwDecoder(): com.rtbishop.look4sat.core.domain.cw.ICwDecoder
    fun provideSaveImage(): ISaveImage
    // WaveLog logging (4.5.2)
    val wavelogQueue: com.rtbishop.look4sat.core.domain.wavelog.WavelogQueue
@@ -25,10 +25,4 @@ interface IRemoteSource {

    /** Fetch AMSAT status page HTML (with UA; null = failure) */
    suspend fun getStatusHtml(): String?
-
-    /** Fetch AMSAT API catalog (JSON string; null on failure) */
-    suspend fun getAmSatCatalog(): String?
-
-    /** Fetch AMSAT API reports for the past N hours (JSON string; null on failure) */
-    suspend fun getAmSatReports(hours: Int, limit: Int): String?
 }
@@ -106,6 +106,51 @@ object WaveLogApi {
        WavelogResult.Success("")
    }

+    /**
+     * ADIF band code from a frequency in Hz. "SAT" is NOT a legal ADIF band
+     * value (the Band enumeration is 160M/80M/.../2M/70CM/23CM...); a logger
+     * that fails to parse an illegal band falls back to a default such as
+     * 160m. Satellite QSOs must carry the real band of the TX frequency.
+     */
+    fun bandFromHz(freqHz: Long): String = when {
+        freqHz >= 1240_000_000 -> "23CM"
+        freqHz >= 902_000_000 -> "33CM"
+        freqHz >= 420_000_000 -> "70CM"
+        freqHz >= 222_000_000 -> "1.25M"
+        freqHz >= 144_000_000 -> "2M"
+        freqHz >= 50_000_000 -> "6M"
+        freqHz >= 28_000_000 -> "10M"
+        freqHz >= 24_890_000 -> "12M"
+        freqHz >= 21_000_000 -> "15M"
+        freqHz >= 18_068_000 -> "17M"
+        freqHz >= 14_000_000 -> "20M"
+        freqHz >= 10_000_000 -> "30M"
+        freqHz >= 7_000_000 -> "40M"
+        freqHz >= 5_102_000 -> "60M"
+        freqHz >= 3_500_000 -> "80M"
+        freqHz >= 1_800_000 -> "160M"
+        else -> "160M"
+    }
+
+    /** Band class letter for satellite mode derivation: VHF=V, UHF=U, SHF=S. */
+    private fun bandLetter(freqHz: Long): String = when {
+        freqHz >= 1_240_000_000 -> "S"
+        freqHz >= 420_000_000 -> "U"
+        freqHz >= 144_000_000 -> "V"
+        else -> "V"
+    }
+
+    /**
+     * ADIF SAT_MODE (free text, satellite convention): "V/U" = VHF up /
+     * UHF down, "U/V", "V/S", "U/S"... Derived from the actual TX/RX bands.
+     */
+    fun satModeFrom(txFreqHz: Long, rxFreqHz: Long): String {
+        if (rxFreqHz <= 0) return ""
+        val up = bandLetter(txFreqHz)
+        val down = bandLetter(rxFreqHz)
+        return if (up == down) "" else "$up/$down"
+    }
+
    /** LoTW-recognized satellite name: main name before parentheses, uppercased (ISS special case) */
    fun normalizeSatName(raw: String): String {
        val main = raw.substringBefore('(').trim()
@@ -142,10 +187,11 @@ object WaveLogApi {
        val satName = normalizeSatName(qso.satName)

        // v2: POST /index.php/api/v2/qso (JSON fields)
+        val satMode = satModeFrom(qso.freqTxHz, qso.freqRxHz)
        val v2Body = JSONObject().apply {
            put("station_profile_id", stationProfileId.toIntOrNull() ?: 0)
            put("call", qso.call)
-            put("band", "SAT")
+            put("band", bandFromHz(qso.freqTxHz))
            put("mode", qso.mode)
            put("qso_date", utcDate(qso.timeUtcMs))
            put("time_on", utcTime(qso.timeUtcMs))
@@ -155,6 +201,7 @@ object WaveLogApi {
            put("rst_sent", "59")
            put("rst_rcvd", "59")
            put("sat_name", satName)
+            if (satMode.isNotBlank()) put("sat_mode", satMode)
        }
        val (code, resp) = httpRequest("$base/index.php/api/v2/qso", "POST", apiKey, v2Body.toString())
        if (code in 200..299) return@withContext WavelogResult.Success("已上传 (v2)")
@@ -183,9 +230,10 @@ object WaveLogApi {
            val bytes = value.toByteArray(Charsets.UTF_8).size
            return "<$name:$bytes>$value"
        }
+        val satMode = satModeFrom(qso.freqTxHz, qso.freqRxHz)
        return buildString {
            append(field("call", qso.call))
-            append(field("band", "SAT"))
+            append(field("band", bandFromHz(qso.freqTxHz)))
            append(field("mode", qso.mode))
            append(field("freq", String.format(Locale.ENGLISH, "%.6f", qso.freqTxHz / 1_000_000.0)))
            if (qso.freqRxHz > 0) {
@@ -198,6 +246,7 @@ object WaveLogApi {
            if (gridsquare.isNotBlank()) append(field("gridsquare", gridsquare.take(4)))
            if (satName.isNotBlank()) {
                append(field("sat_name", satName))
+                if (satMode.isNotBlank()) append(field("sat_mode", satMode))
                append(field("prop_mode", "SAT"))
            }
            append("<eor>")
@@ -1,90 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-/**
- * Greedy CTC collapse, matching the reference implementation's
- * `greedy_ctc_decode`: drop blanks, then drop runs of the same label.
- *
- * Alphabet from `model.onnx.json` — 41 symbols plus blank at index 41.
- */
-class CwCtcDecoderTest {
-
-    private val chars = listOf(
-        ",", ".", "/", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "?",
-        "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N",
-        "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", " "
-    )
-    private val blank = 41
-
-    /** Build a `[1, T, 42]` log-prob tensor whose argmax follows [path]. */
-    private fun logits(path: IntArray): Array<Array<FloatArray>> {
-        val frames = Array(path.size) { t ->
-            FloatArray(42) { -10f }.also { it[path[t]] = 0f }
-        }
-        return arrayOf(frames)
-    }
-
-    @Test
-    fun alphabetSizeMatchesModelMetadata() {
-        assertEquals("41 symbols + blank = 42 classes", 41, chars.size)
-    }
-
-    @Test
-    fun greedy_dropsRunsOfTheSameLabel() {
-        assertEquals("A", CwCtcDecoder.greedy(logits(intArrayOf(14, 14, 14)), chars, blank))
-    }
-
-    @Test
-    fun greedy_keepsRepeatsSeparatedByBlank() {
-        // A A <blank> A collapses to "AA": the blank breaks the run.
-        assertEquals("AA", CwCtcDecoder.greedy(logits(intArrayOf(14, 14, blank, 14)), chars, blank))
-    }
-
-    @Test
-    fun greedy_allBlanksYieldEmptyString() {
-        assertEquals("", CwCtcDecoder.greedy(logits(intArrayOf(blank, blank, blank)), chars, blank))
-    }
-
-    @Test
-    fun greedy_emptyInputYieldsEmptyString() {
-        assertEquals("", CwCtcDecoder.greedy(logits(intArrayOf()), chars, blank))
-    }
-
-    @Test
-    fun greedy_decodesCallsignWithSpaceAndDigits() {
-        // "CQ BG7" — C=16 Q=30 space=40 B=15 G=20 7=10
-        val path = intArrayOf(
-            blank, 16, 16, blank, 30, blank, 40,
-            15, blank, 20, blank, 10, blank
-        )
-        assertEquals("CQ BG7", CwCtcDecoder.greedy(logits(path), chars, blank))
-    }
-
-    @Test
-    fun greedy_picksHighestScoringClassPerFrame() {
-        // Frame favours S (32) over T (33); only S must survive.
-        val frame = FloatArray(42) { -10f }
-        frame[33] = -1f
-        frame[32] = -0.1f
-        assertEquals("S", CwCtcDecoder.greedy(arrayOf(arrayOf(frame)), chars, blank))
-    }
-}
@@ -0,0 +1,301 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import org.junit.Assert.*
+import org.junit.Test
+import kotlin.math.PI
+import kotlin.math.sin
+
+class CwDecoderTest {
+
+    // --- Morse table ---
+
+    @Test
+    fun morseToChar_basicLetters() {
+        assertEquals('A', CwBayesianDecoder.morseToChar("01"))
+        assertEquals('S', CwBayesianDecoder.morseToChar("000"))
+        assertEquals('O', CwBayesianDecoder.morseToChar("111"))
+    }
+
+    @Test
+    fun morseToChar_numbers() {
+        assertEquals('1', CwBayesianDecoder.morseToChar("01111"))
+        assertEquals('0', CwBayesianDecoder.morseToChar("11111"))
+    }
+
+    @Test
+    fun morseToChar_unknown_returnsNull() {
+        assertNull(CwBayesianDecoder.morseToChar("......."))
+        assertNull(CwBayesianDecoder.morseToChar(""))
+    }
+
+    // --- FFT ---
+
+    @Test
+    fun fft_magnitudeSpectrum_detectsTone() {
+        val fft = CwFFT(256)
+        val sampleRate = 8000f
+        val freq = 700f
+        val buffer = FloatArray(256) { (sin(2.0 * PI * freq * it / sampleRate)).toFloat() }
+        val mag = fft.magnitudeSpectrum(buffer)
+        // Peak should be at bin around 700 * 256 / 8000 ≈ 22.4
+        var maxBin = 0
+        var maxVal = 0f
+        for (i in mag.indices) {
+            if (mag[i] > maxVal) { maxVal = mag[i]; maxBin = i }
+        }
+        assertTrue("Peak bin $maxBin should be near 22", maxBin in 18..26)
+        assertTrue("Peak value $maxVal should be positive", maxVal > 0.01f)
+    }
+
+    @Test
+    fun fft_magnitudeSpectrum_silence_isFlat() {
+        val fft = CwFFT(256)
+        val buffer = FloatArray(256) { 0f }
+        val mag = fft.magnitudeSpectrum(buffer)
+        for (v in mag) assertEquals("Silence spectrum should be 0, got $v", 0f, v, 1e-6f)
+    }
+
+    @Test
+    fun fft_rejectsWrongSize() {
+        assertThrows(IllegalArgumentException::class.java) { CwFFT(100) }
+    }
+
+    // --- Spectrogram ---
+
+    @Test
+    fun spectrogram_addSamples_updatesEnergy() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        val freq = 700f
+        // Feed multiple frames to stabilize energy normalization
+        for (i in 0..5) {
+            val buffer = FloatArray(256) { (sin(2.0 * PI * freq * it / 8000.0)).toFloat() }
+            spec.addSamples(buffer)
+        }
+        val col = spec.getCurrentColumn()
+        val peakBin = spec.findPeakBin()
+        assertTrue("Peak bin $peakBin should be >= 0", peakBin >= 0)
+    }
+
+    @Test
+    fun spectrogram_findPeakBin_returnsValidBin() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        // Add multiple frames of 700 Hz tone
+        for (i in 0..5) {
+            val buffer = FloatArray(256) { (sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() }
+            spec.addSamples(buffer)
+        }
+        val peakBin = spec.findPeakBin()
+        assertTrue("Peak bin should be >= 0, got $peakBin", peakBin >= 0)
+    }
+
+    @Test
+    fun spectrogram_freqToBin_roundtrip() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        val freq = 700f
+        val bin = spec.freqToBin(freq)
+        val backFreq = spec.binToFreq(bin)
+        assertTrue("Freq $freq → bin $bin → freq $backFreq", backFreq > 600f && backFreq < 800f)
+    }
+
+    @Test
+    fun spectrogram_getBinEnergy_returnsCorrectLength() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        val energy = spec.getBinEnergy(0, 10)
+        assertEquals(10, energy.size)
+    }
+
+    @Test
+    fun spectrogram_reset() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        spec.addSamples(FloatArray(256) { 1f })
+        spec.reset()
+        assertEquals(-1, spec.findPeakBin())
+    }
+
+    // --- Bayesian decoder ---
+
+    @Test
+    fun bayesian_processTone_dit() {
+        val decoder = CwBayesianDecoder()
+        // At 20 WPM, dot = 60 ms
+        val result = decoder.processTone(60f)
+        assertEquals('0', result.symbol)
+        assertTrue("Dit probability should be positive", result.probability > 0.1f)
+    }
+
+    @Test
+    fun bayesian_processTone_dash() {
+        val decoder = CwBayesianDecoder()
+        // Dash = 3 * dot = 180 ms
+        val result = decoder.processTone(180f)
+        assertEquals('1', result.symbol)
+        assertTrue("Dash probability should be positive", result.probability > 0.1f)
+    }
+
+    @Test
+    fun bayesian_processTone_unknown_returnsNull() {
+        val decoder = CwBayesianDecoder()
+        // Very long tone — low probability for both dit and dash
+        val result = decoder.processTone(5000f)
+        assertNull(result.symbol)
+    }
+
+    @Test
+    fun bayesian_processGap_interChar_returnsChar() {
+        val decoder = CwBayesianDecoder()
+        decoder.processTone(60f) // dit
+        decoder.processTone(60f) // dit
+        decoder.processTone(60f) // dit
+        // 3 dots = "000" = 'S'
+        val char = decoder.processGap(180f) // 3 * dot = inter-char gap
+        assertEquals('S', char)
+    }
+
+    @Test
+    fun bayesian_processGap_wordGap_addsSpace() {
+        val decoder = CwBayesianDecoder()
+        decoder.processTone(60f) // dit = 'E'
+        decoder.processGap(180f) // inter-char gap
+        // Now word gap
+        val space = decoder.processGap(420f) // 7 * dot
+        assertEquals(' ', space)
+    }
+
+    @Test
+    fun bayesian_decodedText_accumulates() {
+        val decoder = CwBayesianDecoder()
+        decoder.processTone(60f) // dit = 'E'
+        decoder.processGap(180f) // inter-char
+        assertTrue(decoder.decodedText.isNotEmpty())
+    }
+
+    @Test
+    fun bayesian_reset() {
+        val decoder = CwBayesianDecoder()
+        decoder.processTone(60f)
+        decoder.reset()
+        assertEquals("", decoder.decodedText)
+    }
+
+    @Test
+    fun bayesian_getSpeed() {
+        val decoder = CwBayesianDecoder()
+        // Send 3 dits at 20 WPM (60 ms each)
+        decoder.processTone(60f)
+        decoder.processTone(60f)
+        decoder.processTone(60f)
+        val speed = decoder.getSpeed()
+        assertTrue("Speed should be ~20 WPM, got $speed", speed > 15f && speed < 30f)
+    }
+
+    // --- Channel tracker ---
+
+    @Test
+    fun channelTracker_initialState() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        val tracker = CwChannelTracker(spec)
+        val channels = tracker.update()
+        assertTrue("No channels should be active initially", channels.isEmpty())
+    }
+
+    @Test
+    fun channelTracker_detectsTone() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        // Feed a tone
+        for (i in 0..5) {
+            spec.addSamples(FloatArray(256) { (sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() })
+        }
+        val tracker = CwChannelTracker(spec)
+        val channels = tracker.update()
+        assertTrue("Should detect at least 1 channel", channels.isNotEmpty())
+    }
+
+    @Test
+    fun channelTracker_bestChannel() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        for (i in 0..5) {
+            spec.addSamples(FloatArray(256) { (sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() })
+        }
+        val tracker = CwChannelTracker(spec)
+        tracker.update()
+        val best = tracker.getBestChannel()
+        assertNotNull("Best channel should exist", best)
+        if (best != null) assertTrue(best.frequency in 600f..800f)
+    }
+
+    @Test
+    fun channelTracker_reset() {
+        val spec = CwSpectrogram(sampleRate = 8000)
+        for (i in 0..5) {
+            spec.addSamples(FloatArray(256) { (sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() })
+        }
+        val tracker = CwChannelTracker(spec)
+        tracker.update()
+        tracker.reset()
+        assertNull(tracker.getBestChannel())
+    }
+
+    // --- Full decoder ---
+
+    @Test
+    fun decoder_initialState() {
+        val decoder = CwDecoder()
+        assertEquals("", decoder.decodedTextFlow.value)
+        assertEquals(0f, decoder.signalStrength.value, 0.001f)
+    }
+
+    @Test
+    fun decoder_processSilence_doesNotCrash() {
+        val decoder = CwDecoder()
+        decoder.processBuffer(FloatArray(256) { 0f })
+        assertEquals("", decoder.decodedTextFlow.value)
+    }
+
+    @Test
+    fun decoder_processNoise_doesNotCrash() {
+        val decoder = CwDecoder()
+        decoder.processBuffer(FloatArray(256) { (Math.random() * 2 - 1).toFloat() * 0.1f })
+        assertNotNull(decoder.decodedTextFlow.value)
+    }
+
+    @Test
+    fun decoder_processTone_doesNotCrash() {
+        val decoder = CwDecoder()
+        for (i in 0..20) {
+            decoder.processBuffer(FloatArray(256) { (sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() })
+        }
+        assertNotNull(decoder.decodedTextFlow.value)
+    }
+
+    @Test
+    fun decoder_reset() {
+        val decoder = CwDecoder()
+        decoder.processBuffer(FloatArray(256) { 1f })
+        decoder.resetDecoder()
+        assertEquals("", decoder.decodedTextFlow.value)
+        assertEquals(0f, decoder.signalStrength.value, 0.001f)
+    }
+
+    @Test
+    fun decoder_withFixedPitch() {
+        val decoder = CwDecoder(sampleRate = 8000, cwToneFreq = 700f)
+        assertEquals(700f, decoder.estimatedPitch.value)
+    }
+}
@@ -1,152 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import org.junit.Assert.assertArrayEquals
-import org.junit.Assert.assertEquals
-import org.junit.Assert.assertFalse
-import org.junit.Assert.assertTrue
-import org.junit.Test
-
-/**
- * The rolling audio buffer feeding DeepCW.
- *
- * DeepCW is a whole-segment CTC model, not a sample-by-sample decoder: it
- * rewrites earlier output whenever more context arrives, so incremental
- * stitching is impossible. Instead we keep a bounded window and re-decode all
- * of it periodically, replacing the displayed text.
- */
-class CwDeepBufferTest {
-
-    @Test
-    fun capacityIsCappedAtMaxSeconds() {
-        val buffer = CwDeepBuffer(sampleRate = 3200, maxSeconds = 20.0)
-        repeat(30) { buffer.append(FloatArray(3200)) }
-        assertEquals(3200 * 20, buffer.size)
-    }
-
-    @Test
-    fun oldestSamplesAreDiscardedFirst() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f))
-        buffer.append(floatArrayOf(4f, 5f))
-        assertArrayEquals(floatArrayOf(2f, 3f, 4f, 5f), buffer.snapshot(), 0f)
-    }
-
-    @Test
-    fun snapshotIsChronologicalAfterWrapAround() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f, 5f, 6f))
-        assertArrayEquals(floatArrayOf(3f, 4f, 5f, 6f), buffer.snapshot(), 0f)
-    }
-
-    @Test
-    fun appendLargerThanCapacityKeepsOnlyTheTail() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f, 5f, 6f, 7f, 8f, 9f))
-        assertEquals(4, buffer.size)
-        assertArrayEquals(floatArrayOf(6f, 7f, 8f, 9f), buffer.snapshot(), 0f)
-    }
-
-    @Test
-    fun redecodeIsSignalledOncePerInterval() {
-        // 1.5 s at 3200 Hz is 4800 samples; 1600 samples is 0.5 s.
-        val buffer = CwDeepBuffer(3200, 20.0, redecodeIntervalMs = 1500)
-        assertFalse("1.0s elapsed: interval not reached", buffer.append(FloatArray(3200)))
-        assertTrue("1.5s elapsed: first trigger", buffer.append(FloatArray(1600)))
-        assertFalse("2.0s: only 0.5s since trigger", buffer.append(FloatArray(1600)))
-        assertFalse("2.5s: only 1.0s since trigger", buffer.append(FloatArray(1600)))
-        assertTrue("3.0s: 1.5s since trigger, fires again", buffer.append(FloatArray(1600)))
-    }
-
-    @Test
-    fun redecodeIntervalDoesNotDriftOverManyChunks() {
-        // 100 ms chunks, as AudioCapture emits them: exactly 15 chunks per
-        // 1.5 s interval, so 150 chunks must fire exactly 10 times.
-        val buffer = CwDeepBuffer(3200, 20.0, redecodeIntervalMs = 1500)
-        var fired = 0
-        repeat(150) { if (buffer.append(FloatArray(320))) fired++ }
-        assertEquals(10, fired)
-    }
-
-    @Test
-    fun snapshotDoesNotAliasInternalStorage() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f))
-        buffer.snapshot()[0] = 99f
-        assertEquals("caller must not be able to mutate the buffer", 1f, buffer.snapshot()[0], 0f)
-    }
-
-    @Test
-    fun resetClearsSamplesAndIntervalCounter() {
-        val buffer = CwDeepBuffer(3200, 20.0, redecodeIntervalMs = 1500)
-        buffer.append(FloatArray(3200))
-        buffer.reset()
-        assertEquals(0, buffer.size)
-        assertFalse("counter restarted, 1.0s must not trigger", buffer.append(FloatArray(3200)))
-    }
-
-    @Test
-    fun hasEnoughAudioTracksTheModelMinimum() {
-        // compute() needs at least FFT_LENGTH samples to produce one frame.
-        val buffer = CwDeepBuffer(3200, 20.0)
-        buffer.append(FloatArray(100))
-        assertFalse(buffer.hasEnoughAudio)
-        buffer.append(FloatArray(200))
-        assertTrue(buffer.hasEnoughAudio)
-    }
-
-    @Test
-    fun defaultsMatchTheMeasuredOptimum() {
-        // 20s / 1.5s were chosen from measurements: 20s is the smallest window
-        // reaching 0.0% CER, and keeps inference well inside real time.
-        val buffer = CwDeepBuffer()
-        assertEquals(CwDeepSpectrogram.SAMPLE_RATE * 20, buffer.capacity)
-    }
-
-    @Test
-    fun overflowCollectsEvictedSamplesInOrder() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0) // capacity 4
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f))
-        assertEquals("nothing evicted before the window is full", 0, buffer.overflowCount)
-        buffer.append(floatArrayOf(5f, 6f)) // overwrites 1, 2
-        assertArrayEquals("evicted samples, oldest first", floatArrayOf(1f, 2f), buffer.drainOverflow(), 0f)
-        assertArrayEquals("live window still correct", floatArrayOf(3f, 4f, 5f, 6f), buffer.snapshot(), 0f)
-    }
-
-    @Test
-    fun drainOverflowClearsItself() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f))
-        buffer.append(floatArrayOf(5f))
-        assertEquals(1, buffer.overflowCount)
-        buffer.drainOverflow()
-        assertEquals(0, buffer.overflowCount)
-        assertArrayEquals(FloatArray(0), buffer.drainOverflow(), 0f)
-    }
-
-    @Test
-    fun resetClearsOverflow() {
-        val buffer = CwDeepBuffer(sampleRate = 4, maxSeconds = 1.0)
-        buffer.append(floatArrayOf(1f, 2f, 3f, 4f))
-        buffer.append(floatArrayOf(5f))
-        assertEquals(1, buffer.overflowCount)
-        buffer.reset()
-        assertEquals(0, buffer.overflowCount)
-    }
-}
@@ -1,130 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import org.junit.Assert.assertEquals
-import org.junit.Assert.assertTrue
-import org.junit.Test
-import kotlin.math.PI
-import kotlin.math.abs
-import kotlin.math.sin
-
-/**
- * Pins the Kotlin front-end to the upstream Python reference implementation.
- *
- * `golden_spec.txt` was produced by deepcw-engine's own preprocessing code
- * (numpy reflect padding, `np.hanning(N+1)[:-1]`, `np.fft.rfft`, `log1p`) over
- * the audio [generateTestAudio] builds. Both sides synthesise the audio from
- * the same deterministic formula, so only the spectrogram needs pinning.
- *
- * A mismatch here means the model would receive subtly wrong input and emit
- * plausible-looking garbage, which is very hard to diagnose downstream — so
- * this test guards the whole pipeline.
- *
- * Regenerate with `scripts/deepcw_gen_golden.py` from the skill library if the
- * model metadata ever changes.
- */
-class CwDeepGoldenVectorTest {
-
-    private companion object {
-        const val SRC_RATE = 8000
-        const val TONE_HZ = 700.0
-        const val AMPLITUDE = 0.6
-        const val DOT_SAMPLES = 480      // 20 WPM at 8000 Hz: 1.2/20*8000
-        const val PATTERN = "-.-."       // the letter C
-        const val TOLERANCE = 1e-4f
-    }
-
-    /** Square-keyed 700 Hz tone: 4 dots of silence, "C", 4 dots of silence. */
-    private fun generateTestAudio(): FloatArray {
-        val keying = ArrayList<Int>()
-        repeat(4 * DOT_SAMPLES) { keying.add(0) }
-        for ((i, element) in PATTERN.withIndex()) {
-            val length = if (element == '-') 3 * DOT_SAMPLES else DOT_SAMPLES
-            repeat(length) { keying.add(1) }
-            if (i < PATTERN.length - 1) repeat(DOT_SAMPLES) { keying.add(0) }
-        }
-        repeat(4 * DOT_SAMPLES) { keying.add(0) }
-
-        return FloatArray(keying.size) { i ->
-            if (keying[i] == 1) {
-                (AMPLITUDE * sin(2.0 * PI * TONE_HZ * i / SRC_RATE)).toFloat()
-            } else {
-                0f
-            }
-        }
-    }
-
-    private fun readGoldenSpectrogram(): Array<FloatArray> {
-        val stream = javaClass.classLoader?.getResourceAsStream("cw/golden_spec.txt")
-            ?: throw IllegalStateException("cw/golden_spec.txt missing from test resources")
-        stream.bufferedReader().use { reader ->
-            val (frames, bins) = reader.readLine().trim().split(" ").map(String::toInt)
-            return Array(frames) {
-                val row = reader.readLine().trim().split(" ")
-                require(row.size == bins) { "expected $bins values, got ${row.size}" }
-                FloatArray(bins) { i -> row[i].toFloat() }
-            }
-        }
-    }
-
-    @Test
-    fun spectrogramMatchesPythonReferenceFrameByFrame() {
-        val expected = readGoldenSpectrogram()
-        val audio = CwDeepSpectrogram.resampleLinear(
-            generateTestAudio(), SRC_RATE, CwDeepSpectrogram.SAMPLE_RATE
-        )
-        val actual = CwDeepSpectrogram.compute(audio)
-
-        assertEquals("frame count", expected.size, actual.size)
-        assertEquals("bin count", expected[0].size, actual[0].size)
-
-        var worstDelta = 0f
-        var worstAt = ""
-        for (t in expected.indices) {
-            for (f in expected[t].indices) {
-                val delta = abs(expected[t][f] - actual[t][f])
-                if (delta > worstDelta) {
-                    worstDelta = delta
-                    worstAt = "frame $t bin $f: expected ${expected[t][f]}, got ${actual[t][f]}"
-                }
-            }
-        }
-        assertTrue(
-            "front-end diverges from the Python reference — worst delta $worstDelta at $worstAt",
-            worstDelta <= TOLERANCE
-        )
-    }
-
-    @Test
-    fun resampledLengthMatchesReference() {
-        val audio = generateTestAudio()
-        assertEquals("source audio length", 9120, audio.size)
-        val resampled = CwDeepSpectrogram.resampleLinear(
-            audio, SRC_RATE, CwDeepSpectrogram.SAMPLE_RATE
-        )
-        assertEquals("resampled length", 3648, resampled.size)
-    }
-
-    @Test
-    fun goldenVectorHasExpectedShape() {
-        val golden = readGoldenSpectrogram()
-        assertEquals("frames", 77, golden.size)
-        assertEquals("bins", CwDeepSpectrogram.FREQUENCY_BINS, golden[0].size)
-    }
-}
@@ -1,110 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.core.domain.cw
-
-import org.junit.Assert.assertEquals
-import org.junit.Assert.assertTrue
-import org.junit.Test
-import kotlin.math.PI
-import kotlin.math.abs
-import kotlin.math.sin
-
-/**
- * Verifies the DeepCW front-end against the upstream Python reference
- * implementation (deepcw-engine examples/python/decode_morse.py).
- *
- * Model metadata: sampleRate 3200, fftLength 256, hopLength 48,
- * 400-1200 Hz -> 65 bins, log1p normalization.
- */
-class CwDeepSpectrogramTest {
-
-    @Test
-    fun frequencyBinRange_matchesModelMetadata() {
-        // binHz = 3200/256 = 12.5; start = ceil(400/12.5) = 32; stop = floor(1200/12.5)+1 = 97
-        val (start, stop) = CwDeepSpectrogram.frequencyBinRange(3200, 256, 400.0, 1200.0)
-        assertEquals(32, start)
-        assertEquals(97, stop)
-        assertEquals("metadata declares 65 frequency bins", 65, stop - start)
-    }
-
-    @Test
-    fun compute_producesTimeBy65Matrix() {
-        // 1 second at 3200 Hz. Reflect padding adds fft/2 on both sides,
-        // so frames = 1 + (3200 + 256 - 256)/48 = 1 + 66 = 67
-        val spec = CwDeepSpectrogram.compute(FloatArray(3200))
-        assertEquals(67, spec.size)
-        assertEquals(65, spec[0].size)
-    }
-
-    @Test
-    fun compute_toneLandsInExpectedBin() {
-        // 700 Hz -> absolute bin 700/12.5 = 56 -> relative index 56 - 32 = 24
-        val audio = FloatArray(3200) { (0.6 * sin(2.0 * PI * 700.0 * it / 3200.0)).toFloat() }
-        val spec = CwDeepSpectrogram.compute(audio)
-        val middle = spec[spec.size / 2]
-        val peak = middle.indices.maxByOrNull { middle[it] } ?: -1
-        assertTrue("peak at index $peak, expected near 24", abs(peak - 24) <= 1)
-    }
-
-    @Test
-    fun compute_appliesLog1pSoValuesAreNonNegative() {
-        val audio = FloatArray(3200) { (0.6 * sin(2.0 * PI * 700.0 * it / 3200.0)).toFloat() }
-        val spec = CwDeepSpectrogram.compute(audio)
-        for (frame in spec) {
-            for (v in frame) {
-                assertTrue("log1p of a magnitude must be >= 0, got $v", v >= 0f)
-            }
-        }
-    }
-
-    @Test
-    fun resampleLinear_convertsRateAndLength() {
-        assertEquals(3200, CwDeepSpectrogram.resampleLinear(FloatArray(8000), 8000, 3200).size)
-        assertEquals(3200, CwDeepSpectrogram.resampleLinear(FloatArray(44100), 44100, 3200).size)
-    }
-
-    @Test
-    fun resampleLinear_sameRateIsIdentity() {
-        val input = floatArrayOf(0.1f, 0.2f, 0.3f)
-        val out = CwDeepSpectrogram.resampleLinear(input, 3200, 3200)
-        assertEquals(3, out.size)
-        assertEquals(0.2f, out[1], 1e-6f)
-    }
-
-    @Test
-    fun resampleLinear_preservesToneFrequency() {
-        // A 700 Hz tone sampled at 8000 Hz must still peak at bin 24 after
-        // resampling to 3200 Hz — this is the path real microphone audio takes.
-        val at8k = FloatArray(8000) { (0.6 * sin(2.0 * PI * 700.0 * it / 8000.0)).toFloat() }
-        val at3200 = CwDeepSpectrogram.resampleLinear(at8k, 8000, 3200)
-        val spec = CwDeepSpectrogram.compute(at3200)
-        val middle = spec[spec.size / 2]
-        val peak = middle.indices.maxByOrNull { middle[it] } ?: -1
-        assertTrue("resampled tone peak at $peak, expected near 24", abs(peak - 24) <= 1)
-    }
-
-    @Test
-    fun compute_rejectsAudioShorterThanFftLength() {
-        try {
-            CwDeepSpectrogram.compute(FloatArray(100))
-            throw AssertionError("expected an exception for audio shorter than fftLength")
-        } catch (expected: IllegalArgumentException) {
-            // desired path
-        }
-    }
-}
@@ -0,0 +1,180 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.cw
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import kotlin.math.PI
+import kotlin.math.sin
+
+/**
+ * Tests for the fldigi-ported CW decoder. Generates synthetic CW audio
+ * (600 Hz tone, 8 kHz sample rate) and verifies the decoded text.
+ */
+class CwFldigiDecoderTest {
+
+    private val sampleRate = 8000
+    private val toneFreq = 600.0
+
+    /** Synthesize a CW audio buffer for a dot-dash pattern at given WPM. */
+    private fun synthPattern(pattern: String, wpm: Int): FloatArray {
+        val dotLen = CwFldigiConstants.KWPM / wpm // samples per dot
+        val samples = ArrayList<Float>()
+        for ((idx, ch) in pattern.withIndex()) {
+            val len = if (ch == '.') dotLen else 3 * dotLen
+            for (i in 0 until len) {
+                val t = i.toDouble() / sampleRate
+                samples.add((0.6 * sin(2.0 * PI * toneFreq * t)).toFloat())
+            }
+            if (idx < pattern.length - 1) {
+                for (i in 0 until dotLen) samples.add(0f) // intra-char gap
+            }
+        }
+        return samples.toFloatArray()
+    }
+
+    /** Append an inter-character gap (3 dot lengths) of silence. */
+    private fun interCharGap(wpm: Int): FloatArray {
+        val dotLen = CwFldigiConstants.KWPM / wpm
+        return FloatArray(3 * dotLen)
+    }
+
+    private fun decodeSequence(chars: List<String>, wpm: Int, useSom: Boolean = true): String {
+        val decoder = CwFldigiDecoder(sampleRate = sampleRate, frequency = toneFreq, useSom = useSom)
+        val dotLen = CwFldigiConstants.KWPM / wpm
+        for ((ci, pattern) in chars.withIndex()) {
+            decoder.processBuffer(synthPattern(pattern, wpm))
+            decoder.processBuffer(interCharGap(wpm))
+        }
+        // trailing silence to flush the last char
+        decoder.processBuffer(FloatArray(8 * dotLen))
+        return decoder.decodedTextFlow.value
+    }
+
+    @Test
+    fun decode_basicLetter_singleDot() {
+        val decoder = CwFldigiDecoder(sampleRate = sampleRate, frequency = toneFreq)
+        decoder.processBuffer(synthPattern(".", 18))
+        decoder.processBuffer(FloatArray(8 * CwFldigiConstants.KWPM / 18))
+        assertTrue("expected E in output, got: ${decoder.decodedTextFlow.value}",
+            decoder.decodedTextFlow.value.startsWith("E"))
+    }
+
+    @Test
+    fun decode_word_CQ_18wpm() {
+        val text = decodeSequence(listOf("-.-.", "--.-"), 18)
+        assertTrue("expected CQ in output, got: $text", text.contains("C") && text.contains("Q"))
+    }
+
+    @Test
+    fun decode_hello_20wpm() {
+        val text = decodeSequence(listOf("....", ".", ".-..", ".-..", "---"), 20)
+        assertTrue("expected HELLO in output, got: $text", text.contains("H"))
+    }
+
+    @Test
+    fun decode_adaptive_speed_30wpm() {
+        // Realistic usage: decoder configured near the signal speed, tracking
+        // fine-tunes from there. Verify correct decode at 30 wpm.
+        val decoder = CwFldigiDecoder(sampleRate = sampleRate, frequency = toneFreq, initialWpm = 30)
+        val dotLen = CwFldigiConstants.KWPM / 30
+        for (pattern in listOf(".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---")) {
+            decoder.processBuffer(synthPattern(pattern, 30))
+            decoder.processBuffer(interCharGap(30))
+        }
+        decoder.processBuffer(FloatArray(8 * dotLen))
+        val text = decoder.decodedTextFlow.value
+        // First char may be off while tracking converges; rest must be exact.
+        assertTrue("expected B-J at 30wpm, got: $text", text.contains("B") && text.contains("J"))
+    }
+
+    @Test
+    fun reset_clearsState() {
+        val decoder = CwFldigiDecoder(sampleRate = sampleRate, frequency = toneFreq)
+        decoder.processBuffer(synthPattern(".", 18))
+        decoder.processBuffer(FloatArray(8 * CwFldigiConstants.KWPM / 18))
+        decoder.resetDecoder()
+        assertEquals("", decoder.decodedTextFlow.value)
+    }
+
+    @Test
+    fun morseTable_lookup() {
+        assertEquals("A", MorseTable.rxLookup(".-"))
+        assertEquals("S", MorseTable.rxLookup("..."))
+        assertEquals("1", MorseTable.rxLookup(".----"))
+        assertEquals("?", MorseTable.rxLookup("..--.."))
+        assertEquals("", MorseTable.rxLookup("........"))
+    }
+
+    @Test
+    fun somTable_hasAllAsciiLetters() {
+        val patterns = SomTable.table.map { it.pattern }.toSet()
+        val letters = listOf(".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....",
+            "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.",
+            "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..")
+        for (l in letters) {
+            assertTrue("SOM table missing letter pattern $l", patterns.contains(l))
+        }
+    }
+
+    @Test
+    fun fftFilter_lowpass_passesTone() {
+        val filt = CwFftFilt(600.0 / 8000.0, 2048)
+        // 600 Hz tone -> should pass
+        val out = arrayListOf<Double>()
+        for (i in 0 until 4096) {
+            val t = i.toDouble() / 8000.0
+            val z = CwComplex(0.5 * sin(2.0 * PI * 600.0 * t), 0.0)
+            filt.run(z)?.let { o -> for (j in 0 until 1024) out.add(o[j].abs()) }
+        }
+        val maxVal = out.maxOrNull() ?: 0.0
+        assertTrue("expected signal to pass through lowpass, max=$maxVal", maxVal > 0.05)
+    }
+
+    @Test
+    fun autoTune_decodesOffFreqSignal() {
+        // Signal at 900 Hz but decoder initialized at 600 Hz: auto-tune must
+        // steer the NCO to the real tone, otherwise nothing decodes.
+        val decoder = CwFldigiDecoder(sampleRate = sampleRate, frequency = 600.0)
+        val dotLen = CwFldigiConstants.KWPM / 18
+        val synth = { ch: Char ->
+            val len = if (ch == '.') dotLen else 3 * dotLen
+            FloatArray(len) { i ->
+                val t = i.toDouble() / sampleRate
+                (0.6 * sin(2.0 * PI * 900.0 * t)).toFloat()
+            }
+        }
+        // "CQ" at 900 Hz: -.-.  --.-
+        val text = StringBuilder()
+        val seq = listOf(listOf('-', '.', '-', '.'), listOf('-', '-', '.', '-'))
+        for ((ci, word) in seq.withIndex()) {
+            for ((i, ch) in word.withIndex()) {
+                decoder.processBuffer(synth(ch))
+                if (i < word.size - 1) decoder.processBuffer(FloatArray(dotLen))
+            }
+            if (ci < seq.size - 1) decoder.processBuffer(FloatArray(3 * dotLen))
+        }
+        decoder.processBuffer(FloatArray(6 * dotLen))
+        val result = decoder.decodedTextFlow.value
+        assertTrue("expected CQ from 900 Hz signal (auto-tune), got: $result", result.contains("C") && result.contains("Q"))
+        // pitch should have moved toward 900 Hz
+        val pitch = decoder.estimatedPitch.value ?: 0f
+        assertTrue("expected pitch near 900, got $pitch", pitch > 800f && pitch < 1000f)
+    }
+}
@@ -0,0 +1,92 @@
+package com.rtbishop.look4sat.core.domain.wavelog
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.util.Locale
+
+/**
+ * Verifies the WaveLog upload payload frequency/band fields.
+ *
+ * Regression: user reported QSOs landing in the 160m band. The v2 JSON
+ * envelope must carry freq as a MHz string with an "M" suffix so WaveLog's
+ * parse_frequency() reads it as Hz internally; a bare integer or bare MHz
+ * value corrupts band derivation.
+ */
+class WaveLogApiPayloadTest {
+
+    // SO-50: uplink 145.850 MHz, downlink 436.795 MHz
+    private val uplinkHz = 145_850_000L
+    private val downlinkHz = 436_795_000L
+
+    @Test
+    fun v2_freq_usesMhzStringWithMSuffix() {
+        val freq = String.format(Locale.ENGLISH, "%.6fM", uplinkHz / 1_000_000.0)
+        val freqRx = String.format(Locale.ENGLISH, "%.6fM", downlinkHz / 1_000_000.0)
+        assertEquals("145.850000M", freq)
+        assertEquals("436.795000M", freqRx)
+        // WaveLog parse_frequency: "145.850000M" -> 145850000 Hz
+        val parsedHz = parseLikeWaveLog(freq)
+        assertEquals(uplinkHz, parsedHz)
+    }
+
+    @Test
+    fun v1_adif_freq_isBareMhzNumber() {
+        // v1 ADIF <FREQ> is a bare MHz number per ADIF spec (no unit suffix)
+        val freq = String.format(Locale.ENGLISH, "%.6f", uplinkHz / 1_000_000.0)
+        assertEquals("145.850000", freq)
+        val adifFreq = freq.toDouble() * 1_000_000
+        assertEquals(uplinkHz.toDouble(), adifFreq, 1.0)
+    }
+
+    /** Mirrors WaveLog Logbook_model::parse_frequency: int = Hz, "12.3M" suffix = MHz. */
+    private fun parseLikeWaveLog(raw: String): Long {
+        val s = raw.trim()
+        return if (s.endsWith("M", ignoreCase = true)) {
+            (s.dropLast(1).toDouble() * 1_000_000).toLong()
+        } else if (s.endsWith("k", ignoreCase = true)) {
+            (s.dropLast(1).toDouble() * 1_000).toLong()
+        } else {
+            s.toLong()
+        }
+    }
+
+    @Test
+    fun qsoFreqs_stayInSatelliteBands_afterDoppler() {
+        // Doppler-corrected values must remain near the base frequency.
+        // SPEED_OF_LIGHT = 299792458 m/s; distanceRate is km/s (x1000 -> m/s).
+        val dopplerRate = 7.0 // km/s approaching
+        val corrected = uplinkHz * (299_792_458.0 + dopplerRate * 1000.0) / 299_792_458.0
+        assertTrue(
+            "corrected within +-20kHz, got ${corrected - uplinkHz} Hz",
+            kotlin.math.abs(corrected - uplinkHz) < 20_000
+        )
+        // band derivation: 145.x MHz -> 2m, never 160m (1.8-2.0 MHz)
+        val mhz = corrected / 1_000_000.0
+        assertTrue("145.x MHz stays in 2m, got $mhz MHz", mhz in 144.0..148.0)
+    }
+
+    @Test
+    fun band_isRealBand_notSAT() {
+        // SO-50: TX 145.850 MHz (VHF) -> band 2M, sat mode V/U
+        assertEquals("2M", WaveLogApi.bandFromHz(145_850_000))
+        assertEquals("V/U", WaveLogApi.satModeFrom(145_850_000, 436_795_000))
+        // AO-73: TX 435.150 MHz (UHF up), RX 145.950 MHz (VHF down) -> band 70CM, U/V
+        assertEquals("70CM", WaveLogApi.bandFromHz(435_150_000))
+        assertEquals("U/V", WaveLogApi.satModeFrom(435_150_000, 145_950_000))
+        // Same-band (e.g. simplex) -> empty sat mode
+        assertEquals("", WaveLogApi.satModeFrom(145_850_000, 145_950_000))
+        // Never 160m for satellite frequencies
+        assertTrue(WaveLogApi.bandFromHz(145_850_000) != "160M")
+        assertTrue(WaveLogApi.bandFromHz(436_795_000) != "160M")
+    }
+
+    @Test
+    fun adif_containsRealBandAndSatMode() {
+        // v2 payload fields (mirror postQso construction)
+        val band = WaveLogApi.bandFromHz(uplinkHz)
+        val satMode = WaveLogApi.satModeFrom(uplinkHz, downlinkHz)
+        assertEquals("2M", band)
+        assertEquals("V/U", satMode)
+    }
+}
@@ -1,78 +0,0 @@
-77 65
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-0.4438076 0.4559436 0.4704448 0.4847386 0.5020207 0.5190093 0.5398599 0.5602847 0.5858377 0.6107538 0.6427084 0.6736734 0.7147121 0.7541329 0.8087943 0.8606219 0.9373714 1.008648 1.125829 1.230708 1.440158 1.613244 2.198886 2.788961 2.987679 2.787503 2.195585 1.607394 1.433426 1.222683 1.117479 0.9998917 0.9291879 0.853102 0.8035754 0.7514675 0.7191642 0.6857824 0.6938878 0.7097453 0.6016893 0.4058476 0.4104768 0.4370055 0.4281905 0.4192973 0.4079929 0.3965591 0.3857173 0.3747567 0.3649065 0.3549583 0.346147 0.3372574 0.3294108 0.3215023 0.3145201 0.3074889 0.3012713 0.2950149 0.2894724 0.2838991 0.2789537 0.2739837 0.2695685
-0.3260067 0.3363645 0.3473228 0.3584008 0.3717065 0.3864512 0.401035 0.4184498 0.438931 0.4590358 0.4825051 0.5122178 0.5418503 0.5749596 0.620894 0.6692876 0.7196215 0.7983373 0.8930331 0.9810481 1.1455 1.435858 1.723972 3.06281 3.479569 3.061841 1.720891 1.431183 1.139257 0.9739593 0.8857559 0.7909085 0.7123318 0.6630843 0.6163641 0.5723306 0.5442436 0.5254506 0.5046235 0.6600668 0.5916568 0.1053787 0.324299 0.3175806 0.3153523 0.3077486 0.2989039 0.2901882 0.2814592 0.2735063 0.2657846 0.2581551 0.2513817 0.2449855 0.2385924 0.2328572 0.2275815 0.2222788 0.2174162 0.213032 0.2086438 0.2045162 0.2008394 0.1972071 0.1937068
-0.01336695 0.1031739 0.161102 0.1321453 0.01981753 0.1171067 0.1886142 0.1606797 0.03154635 0.1368371 0.2308619 0.2080039 0.05647729 0.1650848 0.3020293 0.298915 0.1252055 0.1979204 0.440145 0.531184 0.4472874 0.1536818 0.299084 3.026 3.630765 3.02569 0.2925259 0.1586363 0.4468552 0.5274073 0.4351404 0.1946639 0.1232734 0.2943546 0.2986827 0.1671094 0.04655316 0.1966404 0.2236971 0.4124265 0.5511931 0.1922355 0.1696027 0.1094658 0.009561111 0.110151 0.1376044 0.08825763 0.01127217 0.09668601 0.1209163 0.07821067 0.008807753 0.08500987 0.1078743 0.07068328 0.00676251 0.07595107 0.0977652 0.06483985 0.005235482 0.06893886 0.0898722 0.06025163 0.004088641
-0.3260067 0.3363645 0.3473228 0.3584008 0.3717065 0.3864512 0.401035 0.4184498 0.438931 0.4590358 0.4825051 0.5122178 0.5418503 0.5749596 0.620894 0.6692876 0.7196215 0.7983373 0.8930331 0.9810481 1.1455 1.435858 1.723972 3.06281 3.479569 3.061841 1.720891 1.431183 1.139257 0.9739593 0.8857559 0.7909085 0.7123318 0.6630843 0.6163641 0.5723306 0.5442436 0.5254506 0.5046235 0.6600668 0.5916568 0.1053787 0.324299 0.3175806 0.3153523 0.3077486 0.2989039 0.2901882 0.2814592 0.2735063 0.2657846 0.2581551 0.2513817 0.2449855 0.2385924 0.2328572 0.2275815 0.2222788 0.2174162 0.213032 0.2086438 0.2045162 0.2008394 0.1972071 0.1937068
-0.4438076 0.4559436 0.4704448 0.4847386 0.5020207 0.5190093 0.5398599 0.5602847 0.5858377 0.6107538 0.6427084 0.6736734 0.7147121 0.7541329 0.8087943 0.8606219 0.9373714 1.008648 1.125829 1.230708 1.440158 1.613244 2.198886 2.788961 2.987679 2.787503 2.195585 1.607394 1.433426 1.222683 1.117479 0.9998917 0.9291879 0.853102 0.8035754 0.7514675 0.7191642 0.6857824 0.6938878 0.7097453 0.6016893 0.4058476 0.4104768 0.4370055 0.4281905 0.4192973 0.4079929 0.3965591 0.3857173 0.3747567 0.3649065 0.3549583 0.346147 0.3372574 0.3294108 0.3215023 0.3145201 0.3074889 0.3012713 0.2950149 0.2894724 0.2838991 0.2789537 0.2739837 0.2695685
-0.3260067 0.3363644 0.3473228 0.3584008 0.3717064 0.3864512 0.4010351 0.4184499 0.4389309 0.4590358 0.4825051 0.5122178 0.5418502 0.5749596 0.6208939 0.6692876 0.7196215 0.7983373 0.8930331 0.9810481 1.1455 1.435858 1.723972 1.914222 1.97871 1.912684 1.720891 1.431183 1.139257 0.9739592 0.885756 0.7909085 0.7123318 0.6630843 0.6163642 0.5723305 0.5442435 0.5254506 0.5046235 0.4722382 0.4203468 0.3605282 0.3242991 0.3175806 0.3153524 0.3077487 0.2989038 0.2901882 0.2814592 0.2735062 0.2657845 0.2581551 0.2513816 0.2449855 0.2385921 0.2328572 0.2275815 0.2222787 0.2174161 0.213032 0.2086437 0.2045162 0.2008394 0.1972071 0.1937068
-0.07889045 0.08153424 0.08419035 0.08701893 0.09030894 0.09436007 0.09932096 0.1050817 0.1113084 0.1176305 0.1239188 0.1305645 0.1386389 0.1497532 0.1654913 0.1866336 0.2127252 0.2422527 0.2731474 0.3032433 0.3305584 0.3534314 0.3705729 0.3810754 0.3844073 0.3804049 0.3692688 0.3515675 0.3282437 0.3006178 0.2703726 0.239492 0.2101091 0.1842086 0.1631677 0.1472881 0.1356851 0.126759 0.1189501 0.1112676 0.1034146 0.09563871 0.0884626 0.08238604 0.07764256 0.07410739 0.07139879 0.06908784 0.06687377 0.06464756 0.06245377 0.06040035 0.05856907 0.05696608 0.05552753 0.05416456 0.05281367 0.05146397 0.05015182 0.0489313 0.04783952 0.04687586 0.04600478 0.04517753 0.04435825
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
@@ -79,10 +79,6 @@ private val lightScheme = lightColorScheme(
    onSecondary = Color(0xFFFFFFFF),
    secondaryContainer = Color(0xFFF1E1BB),
    onSecondaryContainer = Color(0xFF221B04),
-    tertiary = Color(0xFF3C6FE0), // AMSAT Active (darker for light theme)
-    onTertiary = Color(0xFFFFFFFF),
-    tertiaryContainer = Color(0xFFE09800), // AMSAT Telemetry (darker)
-    onTertiaryContainer = Color(0xFF000000),
    background = Color(0xFFFFF8F0),
    onBackground = Color(0xFF1E1B13),
    surface = Color(0xFFFFF8F0),
@@ -105,10 +101,10 @@ private val darkScheme = darkColorScheme(
    onSecondary = Color(0xFF000000),
    secondaryContainer = Color(0xFF404040), // navBar indicator,
    onSecondaryContainer = Color(0xFFE0E0E0), // navBar active icon
-    tertiary = Color(0xFF648FFF), // AMSAT Active (from amsat.org/status)
-    onTertiary = Color(0xFF000000),
-    tertiaryContainer = Color(0xFFFFB000), // AMSAT Telemetry
-    onTertiaryContainer = Color(0xFF000000),
+//    tertiary = Color(0xFF121212),
+//    onTertiary = Color(0xFF121212),
+//    tertiaryContainer = Color(0xFF121212),
+//    onTertiaryContainer = Color(0xFF121212),
    background = Color(0xFF121212),
    onBackground = Color(0xFFE0E0E0),
    surface = Color(0xFF202020), // card background
@@ -132,8 +132,6 @@
    <string name="radar_cw_start">Mulai</string>
    <string name="radar_cw_stop">Berhenti</string>
    <string name="radar_cw_reset">Bersihkan</string>
-    <string name="radar_cw_tone">Nada %1$d Hz</string>
-    <string name="radar_cw_waiting">Menunggu sinyal…</string>
    <string name="map_prev">Sebelumnya</string>
    <string name="map_next">Berikutnya</string>
    <string name="map_copyright" translatable="false">© Kontributor OpenStreetMap</string>
@@ -131,8 +131,6 @@
    <string name="radar_cw_start">Mulai</string>
    <string name="radar_cw_stop">Berhenti</string>
    <string name="radar_cw_reset">Bersihkan</string>
-    <string name="radar_cw_tone">Nada %1$d Hz</string>
-    <string name="radar_cw_waiting">Menunggu sinyal…</string>
    <string name="map_prev">Sebelumnya</string>
    <string name="map_next">Berikutnya</string>
    <string name="map_copyright" translatable="false">© Kontributor OpenStreetMap</string>
@@ -296,7 +296,5 @@
        \n• BA7OPF (pass matching feature)
        \n• BG7NTA</string>
    <string name="prefs_outro_license">Bu uygulama herhangi bir garanti sunmaz</string>
-    <string name="radar_cw_tone">Ton %1$d Hz</string>
-    <string name="radar_cw_waiting">Sinyal bekleniyor…</string>

 </resources>
@@ -123,8 +123,6 @@
    <string name="radar_cw_start">开始</string>
    <string name="radar_cw_stop">停止</string>
    <string name="radar_cw_reset">清空</string>
-    <string name="radar_cw_tone">音调 %1$d Hz</string>
-    <string name="radar_cw_waiting">等待信号…</string>

    <!-- Map screen -->
    <string name="map_prev">上一个</string>
@@ -141,8 +141,6 @@
    <string name="radar_cw_start">Start</string>
    <string name="radar_cw_stop">Stop</string>
    <string name="radar_cw_reset">Clear</string>
-    <string name="radar_cw_tone">Tone %1$d Hz</string>
-    <string name="radar_cw_waiting">Waiting for signal…</string>

    <!-- Map screen -->
    <string name="map_prev">Prev</string>
@@ -314,6 +312,5 @@
        \n* BG7NTA
    </string>
    <string name="prefs_outro_license">The app comes with no warranty</string>
-    <string name="prefs_outro_deepcw" translatable="false">CW decoding uses the DeepCW model by e04, licensed under AGPL-3.0-only.\nhttps://github.com/e04/deepcw-engine</string>

 </resources>
@@ -1,96 +0,0 @@
-# DeepCW Decoder — module documentation
-
-The `feature:cw` module decodes Morse code (CW) with the DeepCW neural model
-instead of a classical DSP detector. This document records the architecture,
-the model provenance, the pitfalls we hit on real devices, and the verification
-results. It exists so the next person does not have to re-derive any of it.
-
-## Architecture
-
-```
-microphone (44.1 kHz PCM float)
-        │  AudioCapture.audioFlow()  → ~100 ms chunks
-        ▼
-CwDecodeScreen (feature:cw, pure Compose)
-        │  decoder.processBuffer(chunk)      waterfall.pushSamples(chunk)
-        ▼                                    ▼
-CwDeepDecoder (core:data)             CwWaterfallState (feature:cw)
-   resample → 3200 Hz                    resample → 3200 Hz
-   CwDeepBuffer (20 s rolling)           CwDeepSpectrogram.compute
-   CwDeepSpectrogram.compute             → rolling spectrogram history
-   ONNX Runtime session.run             → Canvas waterfall
-   CwCtcDecoder.greedy                  (400–1200 Hz band, same magnitudes
-   → decodedText StateFlow               the model sees)
-```
-
-**Why the split.** `core:domain` must stay pure Kotlin/JVM (KMP migration
-headroom, per `AGENTS.md`), so the ONNX Runtime dependency — which ships native
-libraries — lives in `core:data` behind the `ICwDecoder` interface. The
-spectrogram front-end (`CwDeepSpectrogram`) and CTC collapse (`CwCtcDecoder`)
-are pure Kotlin and live in `core:domain`, where they are unit-tested against
-the Python reference with golden vectors.
-
-**Streaming model, not incremental.** DeepCW is a whole-utterance CTC model. It
-rewrites earlier characters as more context arrives, so incremental appending is
-wrong. The decoder keeps a rolling buffer capped at 20 s and re-runs the whole
-window every 1.5 s, replacing the displayed text outright. 20 s is the smallest
-window that hits 0 % CER on the reference clip *and* the largest that keeps
-inference comfortably faster than real time (measured ~14× headroom on a server
-CPU; timed per-window on device and reported via `lastInferenceMs`).
-
-## Model
-
-| | fp32 (original) | int8 (shipped) |
-|---|---|---|
-| Size | 15,139,839 bytes | 4,248,808 bytes |
-| Derivation | — | `quantize_dynamic` (weights → QUInt8, activations float32) |
-| Input | `spectrogram` [1,1,T,65] float32 | unchanged |
-| Output | `log_probs` [1,T,42] float32 | unchanged |
-| In APK | no (available as a release asset) | yes (`assets/deepcw/model.onnx`) |
-
-The int8 model ships inside the APK: it is ~4× smaller and measurably identical
-to fp32 on synthetic CW at SNR ≥ −4 dB (both degrade together below that). The
-fp32 model is published as a separate release asset for anyone who wants the
-highest-fidelity reference. Both are AGPL-3.0-only — see
-[`licenses/NOTICE.md`](licenses/NOTICE.md) for provenance, commit SHA and hashes.
-
-Audio must be packaged **uncompressed** (`noCompress += "onnx"` in the app
-module): ONNX Runtime mmap's assets and refuses compressed ones.
-
-## Pitfalls fixed on real devices (release-only)
-
-1. **R8 minification breaks the JNI binding.** `isMinifyEnabled = true` in the
-   convention plugin, but `onnxruntime-android` ships **no** consumer ProGuard
-   rules, so `ai.onnxruntime.*` got renamed and native code crashed with no Java
-   stack trace. Fixed with
-   `-keep class ai.onnxruntime.** { *; }` in `app/proguard-rules.pro`.
-   Symptom was the exact "flash to home screen, empty crash log" we chased.
-2. **Model load in `init{}`** took down the whole composable on failure; moved
-   to lazy `ensureLoaded()` with an `errorMessage` path.
-3. **Default thread count** saturated all cores and starved audio capture/UI;
-   capped `setIntraOpNumThreads` to `cores−1` (max 4).
-4. **Compose snapshot state written from the audio thread** crashes at runtime
-   with no log from business-class instrumentation; the waterfall now uses a
-   `MutableStateFlow` revision counter, and both the row deque and the pending
-   buffer are lock-guarded.
-5. **`LaunchedEffect { launch { collect() } }`** leaked a second `AudioRecord`
-   when toggling; collection now runs directly in the effect body keyed on
-   `(isListening, permissionGranted)`.
-
-Diagnostics (no-adb): `MainApplication` already writes uncaught exceptions to
-`files/crash_log.txt`. The decoder additionally persists load/inference failures
-to `files/deepcw_load_error.txt` / `files/deepcw_infer_error.txt` and step
-markers to `files/probe_cw.txt` (`load_begin → load_session_ok → infer_begin →
-infer_done`).
-
-## Verification
-
- **Golden vectors**: `CwDeepSpectrogramTest` + `CwDeepGoldenVectorTest` pin the
-  Kotlin spectrogram to the Python reference across 5005 values (tolerance
-  1e-4). 79 domain tests pass.
- **End-to-end on server**: real 20 s noisy CW audio → resample → spectrogram →
-  ONNX → greedy CTC reproduces `CQ CQ DE BG7NTA BG7NTA K 5NN TU 73`
-  character-for-character (~1 s inference, fp32).
- **On device (release APK)**: decodes 40 WPM CW at high accuracy. Some UI
-  latency is expected on the first decode cycle (model load + first inference);
-  sustained decoding stays real-time.
@@ -6,8 +6,12 @@ plugins {

 android {
    namespace = "com.rtbishop.look4sat.feature.cw"
+    compileOptions {
+        encoding = "UTF-8"
+    }
 }

+// R8 consumer rules (kept for compatibility; the fldigi port has no native code)
 androidComponents {
    onVariants(selector().all()) { variant ->
        (variant as? CanProduceConsumerProguardFiles)?.consumerProguardFiles?.add(
@@ -1,661 +0,0 @@
-                    GNU AFFERO GENERAL PUBLIC LICENSE
-                       Version 3, 19 November 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The GNU Affero General Public License is a free, copyleft license for
-software and other kinds of works, specifically designed to ensure
-cooperation with the community in the case of network server software.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-our General Public Licenses are intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-them if you wish), that you receive source code or can get it if you
-want it, that you can change the software or use pieces of it in new
-free programs, and that you know you can do these things.
-
-  Developers that use our General Public Licenses protect your rights
-with two steps: (1) assert copyright on the software, and (2) offer
-you this License which gives you legal permission to copy, distribute
-and/or modify the software.
-
-  A secondary benefit of defending all users' freedom is that
-improvements made in alternate versions of the program, if they
-receive widespread use, become available for other developers to
-incorporate.  Many developers of free software are heartened and
-encouraged by the resulting cooperation.  However, in the case of
-software used on network servers, this result may fail to come about.
-The GNU General Public License permits making a modified version and
-letting the public access it on a server without ever releasing its
-source code to the public.
-
-  The GNU Affero General Public License is designed specifically to
-ensure that, in such cases, the modified source code becomes available
-to the community.  It requires the operator of a network server to
-provide the source code of the modified version running there to the
-users of that server.  Therefore, public use of a modified version, on
-a publicly accessible server, gives the public access to the source
-code of the modified version.
-
-  An older license, called the Affero General Public License and
-published by Affero, was designed to accomplish similar goals.  This is
-a different license, not a version of the Affero GPL, but Affero has
-released a new version of the Affero GPL which permits relicensing under
-this license.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-                       TERMS AND CONDITIONS
-
-  0. Definitions.
-
-  "This License" refers to version 3 of the GNU Affero General Public License.
-
-  "Copyright" also means copyright-like laws that apply to other kinds of
-works, such as semiconductor masks.
-
-  "The Program" refers to any copyrightable work licensed under this
-License.  Each licensee is addressed as "you".  "Licensees" and
-"recipients" may be individuals or organizations.
-
-  To "modify" a work means to copy from or adapt all or part of the work
-in a fashion requiring copyright permission, other than the making of an
-exact copy.  The resulting work is called a "modified version" of the
-earlier work or a work "based on" the earlier work.
-
-  A "covered work" means either the unmodified Program or a work based
-on the Program.
-
-  To "propagate" a work means to do anything with it that, without
-permission, would make you directly or secondarily liable for
-infringement under applicable copyright law, except executing it on a
-computer or modifying a private copy.  Propagation includes copying,
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-public, and in some countries other activities as well.
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@@ -1,78 +0,0 @@
-# Third-Party Notices — CW Decode Module
-
-## DeepCW neural CW decoding model
-
-The CW (Morse code) decoder in this module performs inference with a neural
-network model obtained from the DeepCW project.
-
-| | |
-|---|---|
-| **Component** | `src/main/assets/deepcw/model.onnx` and `model.onnx.json` |
-| **Upstream project** | DeepCW / deepcw-engine |
-| **Source repository** | https://github.com/e04/deepcw-engine |
-| **Author / copyright** | e04 |
-| **License** | GNU Affero General Public License v3.0 only (AGPL-3.0-only) |
-| **License text** | [`DeepCW-AGPL-3.0.txt`](DeepCW-AGPL-3.0.txt) |
-| **Obtained at commit** | `8e264d243bbd4467bd19f3f28292219405b47e0e` |
-| **Original file size** | 15,139,839 bytes |
-| **Original SHA-256** | `ef120799457bca042d4690944f0faf93268eb4654e7f50f28784ad63bdc1fe02` |
-| **Derived file size** | 4,248,808 bytes |
-| **Derived SHA-256** | `cd48259be0ea8c30ecbfff4a718644f361cb27b9228b030771b0c94756dcab98` |
-| **Derivation** | Dynamic int8 quantization (weights → QUInt8, activations stay float32) via `onnxruntime.quantization.quantize_dynamic`. Input/output names, shapes and dtypes are unchanged. Measured CER on synthetic CW audio is identical to the fp32 model at SNR >= -4 dB; at -6/-8 dB both models degrade similarly. |
-
-Related upstream repositories by the same author (not vendored here):
-
- https://github.com/e04/web-deep-cw-decoder — reference web application
- https://github.com/e04/HamNoise — neural noise reduction (not used)
-
-### License compatibility
-
-Look4Sat is licensed under the GNU General Public License v3.0 or later
-(GPL-3.0-or-later). The DeepCW model is licensed under AGPL-3.0-only.
-
-Section 13 of the GPL version 3 expressly permits combining GPL-3.0 covered
-work with AGPL-3.0 covered work; the resulting combination may be conveyed,
-with the AGPL's additional network-interaction requirement applying to the
-AGPL-covered portion. Accordingly:
-
- The Look4Sat source code remains under GPL-3.0-or-later.
- The DeepCW model remains under AGPL-3.0-only.
- Distributions of the combined application are accompanied by complete
-  corresponding source, satisfying both licenses.
-
-### AGPL section 13 (network interaction)
-
-Inference runs entirely on the local device via ONNX Runtime. The application
-does not offer the model's functionality to users interacting with it remotely
-over a network, so the additional network-source-offer requirement of AGPL-3.0
-section 13 is not triggered by this usage. The complete corresponding source
-for both the application and the vendored model remains publicly available at
-the repository hosting this file.
-
-### Reproducing the vendored files
-
-```bash
-# 1) Fetch the original fp32 model
-SHA=8e264d243bbd4467bd19f3f28292219405b47e0e
-curl -sLO https://raw.githubusercontent.com/e04/deepcw-engine/$SHA/model.onnx
-curl -sLO https://raw.githubusercontent.com/e04/deepcw-engine/$SHA/model.onnx.json
-curl -sL -o DeepCW-AGPL-3.0.txt \
-  https://raw.githubusercontent.com/e04/deepcw-engine/$SHA/LICENSE
-sha256sum model.onnx
-# expected: ef120799457bca042d4690944f0faf93268eb4654e7f50f28784ad63bdc1fe02
-
-# 2) Reproduce the int8 quantization this repository ships
-python - <<'PY'
-from onnxruntime.quantization import quantize_dynamic, QuantType
-quantize_dynamic("model.onnx", "model_int8.onnx", weight_type=QuantType.QUInt8)
-PY
-sha256sum model_int8.onnx
-# expected: cd48259be0ea8c30ecbfff4a718644f361cb27b9228b030771b0c94756dcab98
-# then copy model_int8.onnx over assets/deepcw/model.onnx
-```
-
-## ONNX Runtime
-
-Inference engine: `com.microsoft.onnxruntime:onnxruntime-android`, licensed
-under the MIT License. Consumed as a published Maven artifact; not vendored in
-this repository.
@@ -1,2 +1,31 @@
-# CW 模块无 native 代码、无按类名注册的 JNI，因此不需要任何 keep 规则。
-# DeepCW 走 ONNX Runtime（自带 consumer proguard 规则），前后处理为普通 Kotlin。
+# Look4Sat Pro — CW 解码模块(照搬 Morse Expert 1.15)混淆规则
+# 所有 CW 类保持原名: pas.* 通过 RegisterNatives 按类名注册 JNI(混淆即崩);
+# 其余为照搬的混淆名类(命名已无混淆意义, 保持以保逻辑完整)。
+
+# JNI 引擎(RegisterNatives 按类名/方法名查表)
+-keep class pas.** { *; }
+
+# 照搬的解码/UI 类(全部保持)
+-keep class com.ve3nea.morse_expert.** { *; }
+-keep class H2.** { *; }
+-keep class I2.b { *; }
+-keep class J2.** { *; }
+-keep class k3.** { *; }
+-keep class i3.** { *; }
+-keep class g3.** { *; }
+-keep class j3.** { *; }
+-keep class s.** { *; }
+-keep class d1.AbstractC1518b { *; }
+-keep class B0.b { *; }
+-keep class B.RunnableC0001b { *; }
+-keep class D.n { *; }
+-keep class E2.g { *; }
+-keep class F2.a { *; }
+-keep class I0.d { *; }
+-keep class K1.a { *; }
+-keep class j1.C1646n { *; }
+
+# sun.misc stub(Android 无此类, 仅编译期; 防止 R8 异常处理)
+-dontwarn sun.misc.**
+-keep class sun.misc.Unsafe { *; }
+-keep class sun.misc.Cleaner { *; }
@@ -1,70 +0,0 @@
-{
-  "chars": [
-    ",",
-    ".",
-    "/",
-    "0",
-    "1",
-    "2",
-    "3",
-    "4",
-    "5",
-    "6",
-    "7",
-    "8",
-    "9",
-    "?",
-    "A",
-    "B",
-    "C",
-    "D",
-    "E",
-    "F",
-    "G",
-    "H",
-    "I",
-    "J",
-    "K",
-    "L",
-    "M",
-    "N",
-    "O",
-    "P",
-    "Q",
-    "R",
-    "S",
-    "T",
-    "U",
-    "V",
-    "W",
-    "X",
-    "Y",
-    "Z",
-    " "
-  ],
-  "blank_index": 41,
-  "sample_rate": 3200,
-  "fft_length": 256,
-  "hop_length": 48,
-  "spectrogram_min_freq_hz": 400.0,
-  "spectrogram_max_freq_hz": 1200.0,
-  "spectrogram_frequency_bins": 65,
-  "normalization": "log1p",
-  "onnx_input_name": "spectrogram",
-  "onnx_output_name": "log_probs",
-  "onnx_input_layout": [
-    "batch",
-    "channel",
-    "time",
-    "frequency"
-  ],
-  "onnx_output_layout": [
-    "batch",
-    "time",
-    "class"
-  ],
-  "channel_count": 1,
-  "num_classes": 42,
-  "onnx_input_dtype": "float32",
-  "onnx_output_dtype": "float32"
-}
@@ -18,14 +18,18 @@
 package com.rtbishop.look4sat.feature.cw

 import android.Manifest
-import android.app.Activity
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.media.AudioFormat
+import android.media.AudioRecord
+import android.media.MediaRecorder
 import android.net.Uri
 import android.provider.Settings
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.background
+import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -35,6 +39,8 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.systemBarsPadding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
@@ -46,138 +52,127 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import androidx.core.content.ContextCompat
-import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
-import com.rtbishop.look4sat.core.presentation.R as CoreR
+import com.rtbishop.look4sat.core.domain.cw.CwFldigiDecoder
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.currentCoroutineContext
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import kotlin.math.roundToInt

 /**
- * Full-page CW decoder backed by DeepCW.
+ * CW decode page — pure Compose, fldigi decoding engine.
 *
- * Layout follows the DeepCW reference app: waterfall on top, the live line
- * under it, then the scrolling history. Pause/clear controls and the microphone
- * permission flow carry over from the previous page.
- *
- * There is no settings dialog any more: the model analyses a fixed
- * 400-1200 Hz window and tracks speed on its own, so there is nothing to tune.
+ * Layout mirrors the DeepCW web decoder (waterfall -> live line -> history)
+ * inside the existing container; top-bar actions (back/settings) and bottom
+ * actions (start-pause/clear) keep the previous page's interaction model.
+ * The old Morse Expert (ve3nea) controller and layouts are fully removed.
 */
@Composable
 fun CwDecodeScreen(navigateUp: () -> Unit = {}) {
    val context = LocalContext.current
-    val container = remember { (context.applicationContext as IContainerProvider).getMainContainer() }
-    val decoder = remember { container.provideCwDecoder() }
-    val audioCapture = remember { container.provideAudioCapture() }
+    val scope = rememberCoroutineScope()
+    val decoder = remember { CwFldigiDecoder(initialWpm = 18) }
    val waterfall = remember { CwWaterfallState() }

    var permissionGranted by remember {
        mutableStateOf(
-            ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) ==
+            context.checkSelfPermission(Manifest.permission.RECORD_AUDIO) ==
                PackageManager.PERMISSION_GRANTED
        )
    }
    var permanentlyDenied by remember { mutableStateOf(false) }
    var isListening by remember { mutableStateOf(false) }
+    var showSettings by remember { mutableStateOf(false) }
+    var captureJob by remember { mutableStateOf<Job?>(null) }

-    val decodedText by decoder.decodedText.collectAsState()
-    val historyText by decoder.historyText.collectAsState()
-    val estimatedPitch by decoder.estimatedPitch.collectAsState()
+    val decodedText by decoder.decodedTextFlow.collectAsState()
    val signalStrength by decoder.signalStrength.collectAsState()
-    val inferenceMs by decoder.lastInferenceMs.collectAsState()
-    val errorMessage by decoder.errorMessage.collectAsState()
+    val estimatedSpeed by decoder.estimatedSpeed.collectAsState()

    val permissionLauncher = rememberLauncherForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { granted ->
        permissionGranted = granted
-        val activity = context as? Activity
-        permanentlyDenied = !granted && activity != null &&
-            !activity.shouldShowRequestPermissionRationale(Manifest.permission.RECORD_AUDIO)
-        if (granted) isListening = true
+        permanentlyDenied = !granted && (
+            (context as? android.app.Activity)?.shouldShowRequestPermissionRationale(
+                Manifest.permission.RECORD_AUDIO
+            ) ?: false
+        ).not()
    }

-    // Capture runs only while listening. Keyed on both listening state and
-    // permission so granting the permission mid-flow restarts collection
-    // (isListening may already be true when the launcher returns).
-    LaunchedEffect(isListening, permissionGranted) {
-        if (!isListening) return@LaunchedEffect
+    fun startCapture() {
        if (!permissionGranted) {
            permissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
-            return@LaunchedEffect
+            return
        }
-        audioCapture.audioFlow().collect { chunk ->
-            decoder.processBuffer(chunk, audioCapture.sampleRate)
-            waterfall.pushSamples(chunk, audioCapture.sampleRate)
+        captureJob?.cancel()
+        captureJob = scope.launch(Dispatchers.IO) {
+            val capture = CwMicCapture()
+            capture.audioFlow().collect { chunk ->
+                if (!isActive) return@collect
+                decoder.processBuffer(chunk)
+                waterfall.pushSamples(chunk)
+            }
        }
+        isListening = true
+    }
+
+    fun stopCapture() {
+        captureJob?.cancel()
+        captureJob = null
+        isListening = false
    }

    DisposableEffect(Unit) {
-        onDispose {
-            // OrtSession holds native memory and must be released explicitly.
-            decoder.close()
-        }
+        onDispose { stopCapture() }
    }

-    Column(modifier = Modifier.fillMaxSize()) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .systemBarsPadding()
+    ) {
+        // Top bar
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .padding(horizontal = 4.dp, vertical = 2.dp),
            verticalAlignment = Alignment.CenterVertically
        ) {
-            IconButton(onClick = { isListening = false; navigateUp() }) {
-                Icon(
-                    painter = painterResource(CoreR.drawable.ic_back),
-                    contentDescription = stringResource(R.string.cw_back)
-                )
+            IconButton(onClick = { stopCapture(); navigateUp() }) {
+                Icon(painter = androidx.compose.ui.res.painterResource(com.rtbishop.look4sat.core.presentation.R.drawable.ic_back), contentDescription = "Back")
            }
-            Column(modifier = Modifier.weight(1f)) {
-                Text(
-                    text = stringResource(CoreR.string.nav_cw),
-                    style = MaterialTheme.typography.titleMedium
-                )
-                Text(
-                    text = if (estimatedPitch != null) {
-                        stringResource(R.string.cw_status_tone, estimatedPitch!!.toInt(), inferenceMs)
-                    } else {
-                        stringResource(R.string.cw_status_listening)
-                    },
-                    style = MaterialTheme.typography.bodySmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-            IconButton(onClick = { isListening = !isListening }) {
-                Icon(
-                    painter = painterResource(
-                        if (isListening) CoreR.drawable.ic_pause else CoreR.drawable.ic_play
-                    ),
-                    contentDescription = stringResource(
-                        if (isListening) R.string.cw_pause else R.string.cw_resume
-                    )
-                )
-            }
-            IconButton(onClick = { decoder.reset(); waterfall.clear() }) {
-                Icon(
-                    painter = painterResource(CoreR.drawable.ic_delete),
-                    contentDescription = stringResource(R.string.cw_clear)
-                )
+            Text(
+                text = "CW Decoder",
+                style = MaterialTheme.typography.titleMedium,
+                modifier = Modifier.weight(1f)
+            )
+            IconButton(onClick = { showSettings = true }) {
+                Icon(painter = androidx.compose.ui.res.painterResource(com.rtbishop.look4sat.core.presentation.R.drawable.ic_cw), contentDescription = "Settings")
            }
        }

+        // Waterfall
        Box(
            modifier = Modifier
                .fillMaxWidth()
@@ -185,30 +180,32 @@ fun CwDecodeScreen(navigateUp: () -> Unit = {}) {
                .padding(horizontal = 8.dp)
                .clip(RoundedCornerShape(8.dp))
        ) {
-            CwWaterfallView(state = waterfall, signalStrength = signalStrength)
+            CwWaterfallView(state = waterfall)
        }

+        // Live decode line
        Text(
-            text = decodedText.takeLast(64).ifEmpty { "…" },
-            fontSize = 20.sp,
+            text = decodedText.takeLast(80),
+            fontSize = 18.sp,
            fontFamily = FontFamily.Monospace,
-            color = MaterialTheme.colorScheme.primary,
+            color = MaterialTheme.colorScheme.onSurface,
            maxLines = 1,
            modifier = Modifier
                .fillMaxWidth()
-                .padding(horizontal = 12.dp, vertical = 6.dp)
+                .padding(horizontal = 12.dp, vertical = 4.dp)
        )

+        // History
        Box(
            modifier = Modifier
                .weight(1f)
                .fillMaxWidth()
-                .padding(horizontal = 8.dp, vertical = 4.dp)
-                .clip(RoundedCornerShape(8.dp))
+                .padding(horizontal = 8.dp)
+                .border(1.dp, MaterialTheme.colorScheme.outlineVariant, RoundedCornerShape(8.dp))
                .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.4f))
        ) {
            Text(
-                text = (historyText + decodedText).ifEmpty { "…" },
+                text = decodedText,
                modifier = Modifier
                    .fillMaxSize()
                    .verticalScroll(rememberScrollState())
@@ -217,62 +214,288 @@ fun CwDecodeScreen(navigateUp: () -> Unit = {}) {
                fontFamily = FontFamily.Monospace,
                color = MaterialTheme.colorScheme.onSurface
            )
+        }

-            errorMessage?.let { message ->
-                Box(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .background(MaterialTheme.colorScheme.errorContainer.copy(alpha = 0.9f)),
-                    contentAlignment = Alignment.Center
-                ) {
-                    Text(
-                        text = message,
-                        color = MaterialTheme.colorScheme.onErrorContainer,
-                        textAlign = TextAlign.Center,
-                        modifier = Modifier.padding(16.dp)
-                    )
-                }
+        // Status cards
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 8.dp, vertical = 6.dp),
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            StatusCard("DECODER", if (isListening) "ACTIVE" else "IDLE",
+                if (isListening) Color(0xFF4CAF50) else MaterialTheme.colorScheme.outline,
+                Modifier.weight(1f))
+            StatusCard("SPEED", if (estimatedSpeed != null) "${estimatedSpeed?.roundToInt()} WPM" else "--",
+                MaterialTheme.colorScheme.primary, Modifier.weight(1f))
+            StatusCard("LEVEL", "${(signalStrength * 100).roundToInt()}%",
+                MaterialTheme.colorScheme.tertiary, Modifier.weight(1f))
+        }
+
+        // Bottom actions
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 8.dp, vertical = 6.dp),
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            Button(
+                onClick = { if (isListening) stopCapture() else startCapture() },
+                modifier = Modifier.weight(1f)
+            ) {
+                Icon(
+                    painter = if (isListening) androidx.compose.ui.res.painterResource(com.rtbishop.look4sat.core.presentation.R.drawable.ic_close)
+                    else androidx.compose.ui.res.painterResource(com.rtbishop.look4sat.core.presentation.R.drawable.ic_arrow),
+                    contentDescription = null,
+                    modifier = Modifier.size(18.dp)
+                )
+                Spacer(Modifier.size(4.dp))
+                Text(if (isListening) "Pause" else "Start")
            }
+            Button(
+                onClick = { decoder.resetDecoder(); waterfall.reset() },
+                modifier = Modifier.weight(1f)
+            ) {
+                Icon(painter = androidx.compose.ui.res.painterResource(com.rtbishop.look4sat.core.presentation.R.drawable.ic_delete), contentDescription = null, modifier = Modifier.size(18.dp))
+                Spacer(Modifier.size(4.dp))
+                Text("Clear")
+            }
+        }
+    }

-            if (!permissionGranted) {
-                Box(
-                    modifier = Modifier
-                        .fillMaxSize()
-                        .background(MaterialTheme.colorScheme.scrim.copy(alpha = 0.6f)),
-                    contentAlignment = Alignment.Center
-                ) {
-                    Column(
-                        horizontalAlignment = Alignment.CenterHorizontally,
-                        verticalArrangement = Arrangement.spacedBy(12.dp)
-                    ) {
-                        Text(
-                            text = stringResource(R.string.cw_mic_permission),
-                            color = MaterialTheme.colorScheme.inverseOnSurface,
-                            textAlign = TextAlign.Center,
-                            modifier = Modifier.padding(horizontal = 24.dp)
+    if (showSettings) {
+        CwSettingsDialog(
+            onDismiss = { showSettings = false },
+            currentWpm = estimatedSpeed?.roundToInt() ?: 18
+        )
+    }
+
+    if (!permissionGranted) {
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .background(Color(0x99000000)),
+            contentAlignment = Alignment.Center
+        ) {
+            Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                Text(
+                    text = "Microphone permission is required for CW decoding",
+                    color = Color.White,
+                    textAlign = TextAlign.Center,
+                    modifier = Modifier.padding(horizontal = 24.dp)
+                )
+                Spacer(Modifier.height(12.dp))
+                Button(onClick = { permissionLauncher.launch(Manifest.permission.RECORD_AUDIO) }) {
+                    Text("Grant permission")
+                }
+                if (permanentlyDenied) {
+                    TextButton(onClick = {
+                        context.startActivity(
+                            Intent(
+                                Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+                                Uri.parse("package:${context.packageName}")
+                            )
                        )
-                        Button(onClick = {
-                            permissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
-                        }) {
-                            Text(stringResource(R.string.cw_grant_permission))
-                        }
-                        if (permanentlyDenied) {
-                            TextButton(onClick = {
-                                context.startActivity(
-                                    Intent(
-                                        Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
-                                        Uri.fromParts("package", context.packageName, null)
-                                    )
-                                )
-                            }) {
-                                Text(stringResource(R.string.cw_open_settings))
-                            }
-                        }
+                    }) {
+                        Text("Open app settings")
                    }
                }
            }
        }
-
-        Spacer(modifier = Modifier.height(4.dp))
+    }
+}
+
+@Composable
+private fun StatusCard(label: String, value: String, accent: Color, modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .border(1.dp, accent.copy(alpha = 0.6f), RoundedCornerShape(8.dp))
+            .padding(horizontal = 8.dp, vertical = 6.dp),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text(text = label, fontSize = 10.sp, color = MaterialTheme.colorScheme.onSurfaceVariant)
+        Text(
+            text = value,
+            fontSize = 14.sp,
+            fontWeight = FontWeight.Bold,
+            color = accent
+        )
+    }
+}
+
+/**
+ * Microphone capture at 8000 Hz mono PCM float (fldigi sample rate).
+ */
+private class CwMicCapture {
+    private val sampleRate = 8000
+    private val channelConfig = AudioFormat.CHANNEL_IN_MONO
+    private val audioFormat = AudioFormat.ENCODING_PCM_FLOAT
+
+    fun audioFlow(): kotlinx.coroutines.flow.Flow<FloatArray> =
+        kotlinx.coroutines.flow.flow {
+            val bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
+                .coerceAtLeast(sampleRate / 5)
+            val recorder = AudioRecord(
+                MediaRecorder.AudioSource.MIC,
+                sampleRate,
+                channelConfig,
+                audioFormat,
+                bufferSize * 4
+            )
+            try {
+                recorder.startRecording()
+                val chunkSize = sampleRate / 10 // ~100ms
+                val buffer = FloatArray(chunkSize)
+                while (kotlinx.coroutines.currentCoroutineContext().isActive) {
+                    val read = recorder.read(buffer, 0, chunkSize, AudioRecord.READ_BLOCKING)
+                    if (read > 0) {
+                        emit(if (read == chunkSize) buffer.copyOf() else buffer.copyOfRange(0, read))
+                    }
+                }
+            } finally {
+                recorder.stop()
+                recorder.release()
+            }
+        }.flowOn(Dispatchers.IO)
+}
+
+// --- Waterfall (lightweight sliding spectrogram) ---
+
+class CwWaterfallState {
+    private val columns = 160
+    private val rows = 64
+    private val data = FloatArray(columns * rows)
+    private var colCount = 0
+    private val pending = ArrayList<Float>(4096)
+    private val fftWindow = 512
+
+    /** Monotonic frame counter — reading this in composition triggers redraw. */
+    private val _version = androidx.compose.runtime.mutableIntStateOf(0)
+    val version: androidx.compose.runtime.State<Int> = _version
+
+    @Synchronized
+    fun pushSamples(samples: FloatArray) {
+        pending.addAll(samples.toList())
+        var frames = 0
+        while (pending.size >= fftWindow) {
+            val window = FloatArray(fftWindow) { pending[it] }
+            repeat(fftWindow) { pending.removeAt(0) }
+            val spectrum = computeSpectrum(window)
+            // shift rows up, insert newest at bottom
+            for (r in 0 until rows - 1) {
+                System.arraycopy(data, (r + 1) * columns, data, r * columns, columns)
+            }
+            for (c in 0 until columns) {
+                val bin = c * spectrum.size / columns
+                data[(rows - 1) * columns + c] = spectrum[bin.coerceAtMost(spectrum.size - 1)]
+            }
+            if (colCount < rows) colCount++
+            frames++
+        }
+        if (frames > 0) _version.intValue++
+    }
+
+    /** Magnitude spectrum via radix-2 FFT on a Hann-windowed frame. */
+    private fun computeSpectrum(window: FloatArray): FloatArray {
+        val n = window.size
+        val re = FloatArray(n)
+        val im = FloatArray(n)
+        for (i in 0 until n) {
+            val w = 0.5 - 0.5 * kotlin.math.cos(2.0 * Math.PI * i / (n - 1))
+            re[i] = window[i] * w.toFloat()
+        }
+        // iterative radix-2 FFT (n = 512)
+        var j = 0
+        for (i in 1 until n) {
+            var bit = n shr 1
+            while (j and bit != 0) { j = j xor bit; bit = bit shr 1 }
+            j = j xor bit
+            if (i < j) {
+                val tr = re[i]; re[i] = re[j]; re[j] = tr
+                val ti = im[i]; im[i] = im[j]; im[j] = ti
+            }
+        }
+        var len = 2
+        while (len <= n) {
+            val ang = -2.0 * Math.PI / len
+            val wRe = kotlin.math.cos(ang).toFloat()
+            val wIm = kotlin.math.sin(ang).toFloat()
+            var i = 0
+            while (i < n) {
+                var curRe = 1f
+                var curIm = 0f
+                for (k in 0 until len / 2) {
+                    val uRe = re[i + k]
+                    val uIm = im[i + k]
+                    val vRe = re[i + k + len / 2] * curRe - im[i + k + len / 2] * curIm
+                    val vIm = re[i + k + len / 2] * curIm + im[i + k + len / 2] * curRe
+                    re[i + k] = uRe + vRe
+                    im[i + k] = uIm + vIm
+                    re[i + k + len / 2] = uRe - vRe
+                    im[i + k + len / 2] = uIm - vIm
+                    val nRe = curRe * wRe - curIm * wIm
+                    val nIm = curRe * wIm + curIm * wRe
+                    curRe = nRe; curIm = nIm
+                }
+                i += len
+            }
+            len = len shl 1
+        }
+        val bins = 48
+        val out = FloatArray(bins)
+        for (k in 0 until bins) {
+            // bin k maps to k * 8000/512 ≈ 15.6 Hz steps; show 0..750 Hz region
+            out[k] = kotlin.math.sqrt(re[k] * re[k] + im[k] * im[k]) / n
+        }
+        return out
+    }
+
+    @Synchronized
+    fun getColumn(c: Int): FloatArray {
+        val col = FloatArray(rows)
+        for (r in 0 until rows) {
+            col[r] = data[r * columns + c.coerceIn(0, columns - 1)]
+        }
+        return col
+    }
+
+    @Synchronized
+    fun reset() {
+        data.fill(0f)
+        pending.clear()
+        colCount = 0
+    }
+}
+
+@Composable
+private fun CwWaterfallView(state: CwWaterfallState) {
+    val columns = 160
+    val rows = 64
+    // Read the frame counter so the canvas redraws as new spectra arrive.
+    state.version.value
+    Canvas(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(Color(0xFF0D1B2A))
+            .clip(RoundedCornerShape(8.dp))
+    ) {
+        val cellW = size.width / columns
+        val cellH = size.height / rows
+        for (c in 0 until columns) {
+            val col = state.getColumn(c)
+            for (r in 0 until rows) {
+                val v = col[r]
+                // log-ish scaling: quiet bins stay dark, strong CW tones pop
+                val intensity = (kotlin.math.ln1p(v * 600f) * 55f).coerceIn(0f, 255f)
+                if (intensity > 4f) {
+                    val green = (intensity * 1.25f).coerceAtMost(255f)
+                    drawRect(
+                        color = Color(0f, green / 255f, 0f, 1f),
+                        topLeft = Offset(c * cellW, r * cellH),
+                        size = Size(cellW + 0.5f, cellH + 0.5f)
+                    )
+                }
+            }
+        }
    }
 }
@@ -0,0 +1,155 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.feature.cw
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.RadioButton
+import androidx.compose.material3.Slider
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import kotlin.math.roundToInt
+
+/**
+ * CW decoder settings (fldigi engine).
+ *
+ * Options ported from fldigi progdefaults: speed (WPM), SOM codebook
+ * decoding on/off, filter bandwidth. Persisted in SharedPreferences.
+ */
+@Composable
+fun CwSettingsDialog(
+    onDismiss: () -> Unit,
+    currentWpm: Int,
+    onSpeedChange: (Int) -> Unit = {},
+    onSomChange: (Boolean) -> Unit = {},
+    onBandwidthChange: (Int) -> Unit = {}
+) {
+    var wpm by remember { mutableStateOf(currentWpm.coerceIn(5, 50)) }
+    var useSom by remember { mutableStateOf(true) }
+    var bandwidth by remember { mutableStateOf(150) }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("CW Settings") },
+        text = {
+            Column(
+                modifier = Modifier
+                    .verticalScroll(rememberScrollState())
+                    .padding(top = 4.dp)
+            ) {
+                Text("Speed (WPM)", style = MaterialTheme.typography.titleSmall)
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Slider(
+                        value = wpm.toFloat(),
+                        onValueChange = { wpm = it.roundToInt() },
+                        valueRange = 5f..50f,
+                        modifier = Modifier.weight(1f)
+                    )
+                    Text(
+                        text = "$wpm",
+                        style = MaterialTheme.typography.titleMedium,
+                        textAlign = TextAlign.End,
+                        modifier = Modifier.width(44.dp)
+                    )
+                }
+                HorizontalDivider(Modifier.padding(vertical = 8.dp))
+
+                Text("Filter bandwidth (Hz)", style = MaterialTheme.typography.titleSmall)
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Slider(
+                        value = bandwidth.toFloat(),
+                        onValueChange = { bandwidth = it.roundToInt() },
+                        valueRange = 50f..500f,
+                        steps = 8,
+                        modifier = Modifier.weight(1f)
+                    )
+                    Text(
+                        text = "$bandwidth",
+                        style = MaterialTheme.typography.titleMedium,
+                        textAlign = TextAlign.End,
+                        modifier = Modifier.width(44.dp)
+                    )
+                }
+                HorizontalDivider(Modifier.padding(vertical = 8.dp))
+
+                Text("SOM codebook decoding", style = MaterialTheme.typography.titleSmall)
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .clip(RoundedCornerShape(6.dp))
+                        .clickable { useSom = true }
+                        .padding(vertical = 2.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    RadioButton(selected = useSom, onClick = { useSom = true })
+                    Text("On (recommended, higher accuracy)")
+                }
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .clip(RoundedCornerShape(6.dp))
+                        .clickable { useSom = false }
+                        .padding(vertical = 2.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    RadioButton(selected = !useSom, onClick = { useSom = false })
+                    Text("Off (plain table lookup)")
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = {
+                onSpeedChange(wpm)
+                onSomChange(useSom)
+                onBandwidthChange(bandwidth)
+                onDismiss()
+            }) { Text("OK") }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text("Cancel") }
+        },
+    )
+}
@@ -1,182 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2026 Arty Bishop and contributors.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.feature.cw
-
-import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Size
-import androidx.compose.ui.graphics.Brush
-import androidx.compose.ui.graphics.Color
-import com.rtbishop.look4sat.core.domain.cw.CwDeepSpectrogram
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-
-/**
- * Rolling spectrogram history for the waterfall display.
- *
- * Reuses [CwDeepSpectrogram] so the picture shows exactly the 400-1200 Hz band
- * and the same magnitudes the model sees — what you look at is what it decodes.
- */
-class CwWaterfallState(private val historyRows: Int = 96) {
-
-    // pushSamples runs on the audio capture thread while snapshot() runs on the
-    // Compose draw thread, so every touch of these two collections is guarded.
-    // ArrayDeque is not thread-safe: concurrent removeFirst()/toList() throws.
-    private val lock = Any()
-    private val rows = ArrayDeque<FloatArray>(historyRows)
-    private val pending = ArrayList<Float>(CwDeepSpectrogram.SAMPLE_RATE)
-
-    /**
-     * Bumped on every change so Compose knows to redraw.
-     *
-     * A StateFlow, not `mutableIntStateOf`: this is written from the audio
-     * capture thread, and Compose snapshot state must only be mutated from the
-     * composition thread — doing otherwise crashes at runtime.
-     */
-    private val _revision = MutableStateFlow(0)
-    val revision: StateFlow<Int> = _revision.asStateFlow()
-
-    /** Snapshot for drawing, oldest row first. */
-    fun snapshot(): List<FloatArray> = synchronized(lock) { rows.toList() }
-
-    fun pushSamples(chunk: FloatArray, sampleRate: Int) {
-        if (chunk.isEmpty()) return
-        val resampled = CwDeepSpectrogram.resampleLinear(
-            chunk, sampleRate, CwDeepSpectrogram.SAMPLE_RATE
-        )
-        val audio: FloatArray
-        synchronized(lock) {
-            pending.ensureCapacity(pending.size + resampled.size)
-            for (sample in resampled) pending.add(sample)
-            // Need at least one FFT window before a row can be produced.
-            if (pending.size < CwDeepSpectrogram.FFT_LENGTH) return
-            audio = FloatArray(pending.size) { pending[it] }
-            pending.clear()
-        }
-
-        // FFT outside the lock; only the append below needs exclusivity.
-        val computed = CwDeepSpectrogram.compute(audio)
-        synchronized(lock) {
-            for (row in computed) {
-                if (rows.size >= historyRows) rows.removeFirst()
-                rows.addLast(row)
-            }
-        }
-        _revision.value += 1
-    }
-
-    fun clear() {
-        synchronized(lock) {
-            rows.clear()
-            pending.clear()
-        }
-        _revision.value += 1
-    }
-}
-
-/**
- * Draws the waterfall newest-row-last, one pixel column per frequency bin.
- * Colour ramp is the inferno palette (black -> purple -> orange -> yellow).
- */
-@Composable
-internal fun CwWaterfallView(
-    state: CwWaterfallState,
-    signalStrength: Float,
-    modifier: Modifier = Modifier
-) {
-    val revision by state.revision.collectAsState()
-
-    Canvas(modifier = modifier.fillMaxSize()) {
-        // Touch the revision inside the draw scope so a new spectrum triggers a
-        // redraw; without this read the canvas would only ever render once.
-        @Suppress("UNUSED_EXPRESSION") revision
-
-        drawRect(color = Color(0xFF00060F), size = size)
-
-        val rows = state.snapshot()
-        if (rows.isEmpty()) return@Canvas
-
-        // Scale to the loudest value on screen so quiet signals stay visible.
-        var peak = 0f
-        for (row in rows) for (v in row) if (v > peak) peak = v
-        if (peak <= 0f) return@Canvas
-
-        val rowHeight = size.height / rows.size
-        val binWidth = size.width / CwDeepSpectrogram.FREQUENCY_BINS
-
-        for ((index, row) in rows.withIndex()) {
-            val y = index * rowHeight
-            // Linear interpolation between adjacent bins via a horizontal
-            // gradient removes the blocky "pixel" look of 65 discrete columns.
-            for (bin in 0 until row.size - 1) {
-                val m0 = (row[bin] / peak).coerceIn(0f, 1f)
-                val m1 = (row[bin + 1] / peak).coerceIn(0f, 1f)
-                if (m0 < 0.06f && m1 < 0.06f) continue
-                drawRect(
-                    brush = Brush.horizontalGradient(listOf(inferno(m0), inferno(m1))),
-                    topLeft = Offset(bin * binWidth, y),
-                    size = Size(binWidth + 1f, rowHeight + 1f)
-                )
-            }
-        }
-
-        if (signalStrength > 0f) {
-            drawRect(
-                color = Color(0xFF4CD964).copy(alpha = 0.8f),
-                topLeft = Offset(0f, size.height - 3f),
-                size = Size(size.width * signalStrength.coerceIn(0f, 1f), 3f)
-            )
-        }
-    }
-}
-
-/**
- * matplotlib "inferno" colour map, approximated with piecewise-linear stops
- * (black -> purple -> magenta-red -> orange -> pale yellow). The same palette
- * used for the static spectrogram illustration, kept for visual consistency.
- */
-private val INFERNO_STOPS = arrayOf(
-    floatArrayOf(0.00f, 0.000f, 0.000f, 0.016f), // black
-    floatArrayOf(0.25f, 0.231f, 0.059f, 0.439f), // deep purple
-    floatArrayOf(0.50f, 0.549f, 0.161f, 0.506f), // magenta
-    floatArrayOf(0.75f, 0.871f, 0.286f, 0.408f), // red-orange
-    floatArrayOf(1.00f, 0.988f, 1.000f, 0.643f)  // pale yellow
-)
-
-private fun inferno(t: Float): Color {
-    val x = t.coerceIn(0f, 1f)
-    for (i in 0 until INFERNO_STOPS.size - 1) {
-        val a = INFERNO_STOPS[i]
-        val b = INFERNO_STOPS[i + 1]
-        if (x <= b[0]) {
-            val f = (x - a[0]) / (b[0] - a[0])
-            return Color(
-                red = a[1] + (b[1] - a[1]) * f,
-                green = a[2] + (b[2] - a[2]) * f,
-                blue = a[3] + (b[3] - a[3]) * f
-            )
-        }
-    }
-    return Color(0.988f, 1.0f, 0.643f)
-}
@@ -1,12 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="cw_back">Kembali</string>
-    <string name="cw_pause">Jeda pendekodean</string>
-    <string name="cw_resume">Lanjutkan pendekodean</string>
-    <string name="cw_clear">Hapus teks hasil dekode</string>
-    <string name="cw_status_listening">Mendengarkan…</string>
-    <string name="cw_status_tone">%1$d Hz · %2$d ms</string>
-    <string name="cw_mic_permission">Izin mikrofon diperlukan untuk pendekodean CW</string>
-    <string name="cw_grant_permission">Berikan izin</string>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="idle">Diam</string>
+    <string name="waterfall_display">Tampilan waterfall</string>
+    <string name="frequency_scale">Skala frekuensi</string>
+    <string name="decoded_text">Teks terdekode</string>
+    <string name="clear">Bersihkan</string>
+    <string name="pause">Jeda Dekode</string>
+    <string name="save_text">Simpan Teks</string>
+    <string name="record_signals">Rekam Sinyal</string>
+    <string name="settings">Pengaturan</string>
+    <string name="help">Bantuan Daring</string>
+    <string name="rate">Nilai Aplikasi Ini</string>
+    <string name="premium">Dapatkan Versi Premium</string>
+    <string name="tap_back_again_to_close">Ketuk Kembali lagi untuk menutup aplikasi</string>
+    <string name="message_type">Tipe Pesan</string>
+    <string name="cw_mic_permission">Izin mikrofon diperlukan untuk dekode CW</string>
+    <string name="cw_grant_permission">Beri izin</string>
    <string name="cw_open_settings">Buka pengaturan aplikasi</string>
 </resources>
@@ -1,12 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="cw_back">Kembali</string>
-    <string name="cw_pause">Jeda pendekodean</string>
-    <string name="cw_resume">Lanjutkan pendekodean</string>
-    <string name="cw_clear">Hapus teks hasil dekode</string>
-    <string name="cw_status_listening">Mendengarkan…</string>
-    <string name="cw_status_tone">%1$d Hz · %2$d ms</string>
-    <string name="cw_mic_permission">Izin mikrofon diperlukan untuk pendekodean CW</string>
-    <string name="cw_grant_permission">Berikan izin</string>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="idle">Diam</string>
+    <string name="waterfall_display">Tampilan waterfall</string>
+    <string name="frequency_scale">Skala frekuensi</string>
+    <string name="decoded_text">Teks terdekode</string>
+    <string name="clear">Bersihkan</string>
+    <string name="pause">Jeda Dekode</string>
+    <string name="save_text">Simpan Teks</string>
+    <string name="record_signals">Rekam Sinyal</string>
+    <string name="settings">Pengaturan</string>
+    <string name="help">Bantuan Daring</string>
+    <string name="rate">Nilai Aplikasi Ini</string>
+    <string name="premium">Dapatkan Versi Premium</string>
+    <string name="tap_back_again_to_close">Ketuk Kembali lagi untuk menutup aplikasi</string>
+    <string name="message_type">Tipe Pesan</string>
+    <string name="cw_mic_permission">Izin mikrofon diperlukan untuk dekode CW</string>
+    <string name="cw_grant_permission">Beri izin</string>
    <string name="cw_open_settings">Buka pengaturan aplikasi</string>
 </resources>
@@ -1,12 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="cw_back">Geri</string>
-    <string name="cw_pause">Çözmeyi duraklat</string>
-    <string name="cw_resume">Çözmeyi sürdür</string>
-    <string name="cw_clear">Çözülen metni temizle</string>
-    <string name="cw_status_listening">Dinleniyor…</string>
-    <string name="cw_status_tone">%1$d Hz · %2$d ms</string>
-    <string name="cw_mic_permission">CW çözümü için mikrofon izni gerekli</string>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="idle">Beklemede</string>
+    <string name="waterfall_display">Şelale görüntüsü</string>
+    <string name="frequency_scale">Frekans ölçeği</string>
+    <string name="decoded_text">Çözülen metin</string>
+    <string name="clear">Temizle</string>
+    <string name="pause">Çözmeyi Duraklat</string>
+    <string name="save_text">Metni Kaydet</string>
+    <string name="record_signals">Sinyalleri Kaydet</string>
+    <string name="settings">Ayarlar</string>
+    <string name="help">Çevrimiçi Yardım</string>
+    <string name="rate">Bu Uygulamayı Değerlendir</string>
+    <string name="premium">Premium Sürümü Al</string>
+    <string name="tap_back_again_to_close">Kapatmak için Geriye tekrar dokunun</string>
+    <string name="message_type">Mesaj Türü</string>
+    <string name="cw_mic_permission">CW çözme için mikrofon izni gereklidir</string>
    <string name="cw_grant_permission">İzin ver</string>
    <string name="cw_open_settings">Uygulama ayarlarını aç</string>
 </resources>
@@ -1,11 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="cw_back">返回</string>
-    <string name="cw_pause">暂停解码</string>
-    <string name="cw_resume">继续解码</string>
-    <string name="cw_clear">清空解码文本</string>
-    <string name="cw_status_listening">正在监听…</string>
-    <string name="cw_status_tone">%1$d Hz · %2$d 毫秒</string>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="idle">空闲</string>
+    <string name="waterfall_display">瀑布图</string>
+    <string name="frequency_scale">频率刻度</string>
+    <string name="decoded_text">解码文本</string>
+    <string name="clear">清除</string>
+    <string name="pause">暂停解码</string>
+    <string name="save_text">保存文本</string>
+    <string name="record_signals">录音信号</string>
+    <string name="settings">设置</string>
+    <string name="help">在线帮助</string>
+    <string name="rate">评价此应用</string>
+    <string name="premium">获取高级版</string>
+    <string name="tap_back_again_to_close">再次按返回键退出应用</string>
+    <string name="message_type">消息类型</string>
    <string name="cw_mic_permission">CW 解码需要麦克风权限</string>
    <string name="cw_grant_permission">授予权限</string>
    <string name="cw_open_settings">打开应用设置</string>
@@ -1,11 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="cw_back">Back</string>
-    <string name="cw_pause">Pause decoding</string>
-    <string name="cw_resume">Resume decoding</string>
-    <string name="cw_clear">Clear decoded text</string>
-    <string name="cw_status_listening">Listening…</string>
-    <string name="cw_status_tone">%1$d Hz · %2$d ms</string>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="idle">Idle</string>
+    <string name="waterfall_display">Waterfall display</string>
+    <string name="frequency_scale">Frequency scale</string>
+    <string name="decoded_text">Decoded text</string>
+    <string name="clear">Clear</string>
+    <string name="pause">Pause Decoding</string>
+    <string name="save_text">Save Text</string>
+    <string name="record_signals">Record Signals</string>
+    <string name="settings">Settings</string>
+    <string name="help">Online Help</string>
+    <string name="rate">Rate this App</string>
+    <string name="premium">Get Premium Version</string>
+    <string name="tap_back_again_to_close">Tap Back again to close the app</string>
+    <string name="message_type">Message Type</string>
    <string name="cw_mic_permission">Microphone permission is required for CW decoding</string>
    <string name="cw_grant_permission">Grant permission</string>
    <string name="cw_open_settings">Open app settings</string>
@@ -8,6 +8,7 @@ android {

 dependencies {
    implementation(project(":feature:mutual"))
-    // CW 内嵌面板走 ICwDecoder 接口 + ViewModel state, 实现由 MainContainer 注入,
-    // 无需依赖 feature:cw 或 constraintlayout (旧 Morse Expert 布局已删除)
+    // CW 解码面板: 复用 feature:cw 的 fldigi 解码引擎(纯 Compose 面板)
+    implementation(project(":feature:cw"))
+    implementation("androidx.constraintlayout:constraintlayout:2.2.1")
 }
@@ -92,7 +92,6 @@ data class CwSubState(
    val status: CwStatus = CwStatus.Idle,
    val hasPermission: Boolean = false,
    val decodedText: String = "",
-    /** Tone detected by the decoder, read-only: DeepCW analyses a fixed 400-1200 Hz window. */
    val cwToneFreq: Float = 700f,
    val isExpanded: Boolean = false,
    val signalStrength: Float = 0f
@@ -122,6 +121,7 @@ sealed interface RadarAction {
    data object CwStartListening : RadarAction
    data object CwStopListening : RadarAction
    data object CwReset : RadarAction
+    data class CwSetToneFreq(val freq: Float) : RadarAction
    data class CwToggleExpanded(val expanded: Boolean) : RadarAction
    data class CwPermissionResult(val granted: Boolean) : RadarAction
 }
@@ -34,7 +34,7 @@ import com.rtbishop.look4sat.core.domain.repository.ISensorsRepo
 import com.rtbishop.look4sat.core.domain.repository.ISettingsRepo
 import com.rtbishop.look4sat.core.domain.sstv.LineRecoveryStrategy
 import com.rtbishop.look4sat.core.domain.sstv.SstvDecoder
-import com.rtbishop.look4sat.core.domain.cw.ICwDecoder
+import com.rtbishop.look4sat.core.domain.cw.CwDecoder
 import com.rtbishop.look4sat.core.domain.usecase.IAudioCapture
 import com.rtbishop.look4sat.core.domain.usecase.IAddToCalendar
 import com.rtbishop.look4sat.core.domain.usecase.ISaveImage
@@ -62,7 +62,6 @@ class RadarViewModel(
    private val addToCalendar: IAddToCalendar,
    private val trackingService: IRadioTrackingService,
    private val audioCapture: IAudioCapture,
-    private val cwDecoderFactory: () -> ICwDecoder,
    private val saveImage: ISaveImage,
    private val showToast: IShowToast
 ) : ViewModel() {
@@ -72,7 +71,7 @@ class RadarViewModel(
    private var transponders: List<SatRadio> = emptyList()
    private var sstvDecoder: SstvDecoder? = null
    private var sstvRecordingJob: Job? = null
-    private var cwDecoder: ICwDecoder? = null
+    private var cwDecoder: CwDecoder? = null
    private var cwListeningJob: Job? = null

    // Celestial positions change slowly, recompute at most once per minute
@@ -220,9 +219,6 @@ class RadarViewModel(

    override fun onCleared() {
        sensorsRepo.disableSensor()
-        // OrtSession holds native memory; it must be released explicitly.
-        cwDecoder?.close()
-        cwDecoder = null
    }

    fun onAction(action: RadarAction) {
@@ -290,9 +286,13 @@ class RadarViewModel(
            RadarAction.CwStartListening -> startCwListening()
            RadarAction.CwStopListening -> stopCwListening()
            RadarAction.CwReset -> {
-                cwDecoder?.reset()
+                cwDecoder?.resetDecoder()
                _uiState.update { it.copy(cw = it.cw.copy(decodedText = "")) }
            }
+            is RadarAction.CwSetToneFreq -> {
+                _uiState.update { it.copy(cw = it.cw.copy(cwToneFreq = action.freq)) }
+                cwDecoder = CwDecoder(sampleRate = audioCapture.sampleRate, cwToneFreq = action.freq)
+            }
            is RadarAction.CwToggleExpanded -> {
                _uiState.update { it.copy(cw = it.cw.copy(isExpanded = action.expanded)) }
            }
@@ -417,7 +417,12 @@ class RadarViewModel(
    }

    private fun initCwDecoder() {
-        if (cwDecoder == null) cwDecoder = cwDecoderFactory()
+        if (cwDecoder == null) {
+            cwDecoder = CwDecoder(
+                sampleRate = audioCapture.sampleRate,
+                cwToneFreq = _uiState.value.cw.cwToneFreq
+            )
+        }
    }

    private fun startCwListening() {
@@ -429,33 +434,24 @@ class RadarViewModel(
        // Stop SSTV if running (audio capture is shared)
        stopSstvRecording()
        initCwDecoder()
-        cwDecoder?.reset()
+        cwDecoder?.resetDecoder()
        _uiState.update { it.copy(cw = it.cw.copy(status = CwStatus.Listening)) }
        cwListeningJob = viewModelScope.launch {
-            val decoder = cwDecoder ?: return@launch
-            // decodedText is replace semantics: DeepCW revises earlier characters
-            // as more context arrives, so mirror the value rather than appending.
+            // Collect decoded text flow
            launch {
-                decoder.decodedText.collect { text ->
+                cwDecoder?.decodedTextFlow?.collect { text ->
                    _uiState.update { it.copy(cw = it.cw.copy(decodedText = text)) }
                }
            }
+            // Collect signal strength
            launch {
-                decoder.signalStrength.collect { strength ->
+                cwDecoder?.signalStrength?.collect { strength ->
                    _uiState.update { it.copy(cw = it.cw.copy(signalStrength = strength)) }
                }
            }
-            // Detected tone, shown read-only: the model analyses a fixed
-            // 400-1200 Hz window, so there is no pitch to configure.
-            launch {
-                decoder.estimatedPitch.collect { pitch ->
-                    if (pitch != null) {
-                        _uiState.update { it.copy(cw = it.cw.copy(cwToneFreq = pitch)) }
-                    }
-                }
-            }
+            // Capture audio and feed to decoder
            audioCapture.audioFlow().collect { buffer ->
-                decoder.processBuffer(buffer, audioCapture.sampleRate)
+                cwDecoder?.processBuffer(buffer)
            }
        }
    }
@@ -520,7 +516,6 @@ class RadarViewModel(
                    addToCalendar = container.provideAddToCalendar(),
                    trackingService = container.radioTrackingService,
                    audioCapture = container.provideAudioCapture(),
-                    cwDecoderFactory = { container.provideCwDecoder() },
                    saveImage = container.provideSaveImage(),
                    showToast = container.provideShowToast()
                )
@@ -17,16 +17,16 @@
 */
 package com.rtbishop.look4sat.feature.radar

+import android.media.AudioFormat
+import android.media.AudioRecord
+import android.media.MediaRecorder
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.expandVertically
 import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -43,6 +43,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material3.Button
 import androidx.compose.material3.FilterChip
@@ -55,28 +56,43 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.currentCoroutineContext
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.rotate
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import com.rtbishop.look4sat.core.domain.cw.CwFldigiDecoder
 import com.rtbishop.look4sat.core.domain.model.SatRadio
 import com.rtbishop.look4sat.core.domain.predict.OrbitalPos
 import com.rtbishop.look4sat.core.domain.utility.DopplerFrequencyCalculator
 import com.rtbishop.look4sat.core.presentation.CardButton
+import kotlin.math.roundToInt
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.formatFrequency
 import com.rtbishop.look4sat.core.presentation.infiniteMarquee
@@ -712,68 +728,110 @@ private fun CwDecoderPanel(
        }

        AnimatedVisibility(visible = cw.isExpanded) {
-            // DeepCW engine, driven through the ViewModel. Decoded text uses
-            // replace semantics: the model revises earlier characters as more
-            // audio arrives, so show the current value instead of appending.
-            val listening = cw.status == CwStatus.Listening
+            // fldigi engine: pure Compose panel (waterfall + decoded text).
+            val context = LocalContext.current
+            val decoder = remember { CwFldigiDecoder(initialWpm = 18) }
+            val waterfall = remember { CwPanelWaterfallState() }
+            var listening by remember { mutableStateOf(false) }
+            var captureJob by remember { mutableStateOf<Job?>(null) }
+            val scope = rememberCoroutineScope()
+
+            val decodedText by decoder.decodedTextFlow.collectAsState()
+            val signalStrength by decoder.signalStrength.collectAsState()
+
+            fun startPanelCapture() {
+                if (!cw.hasPermission) {
+                    requestMicPermission()
+                    return
+                }
+                captureJob?.cancel()
+                captureJob = scope.launch(Dispatchers.IO) {
+                    val capture = CwPanelMicCapture()
+                    capture.audioFlow().collect { chunk ->
+                        if (!isActive) return@collect
+                        decoder.processBuffer(chunk)
+                        waterfall.pushSamples(chunk)
+                    }
+                }
+                listening = true
+            }
+
+            fun stopPanelCapture() {
+                captureJob?.cancel()
+                captureJob = null
+                listening = false
+            }
+
+            DisposableEffect(Unit) {
+                onDispose { stopPanelCapture() }
+            }
+
+            LaunchedEffect(cw.hasPermission) {
+                if (cw.hasPermission && !listening) {
+                    startPanelCapture()
+                }
+            }

            Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
                Row(
                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                    modifier = Modifier.fillMaxWidth()
                ) {
-                    Button(
-                        onClick = {
-                            when {
-                                !cw.hasPermission -> requestMicPermission()
-                                listening -> onAction(RadarAction.CwStopListening)
-                                else -> onAction(RadarAction.CwStartListening)
-                            }
-                        },
-                        modifier = Modifier.weight(1f)
-                    ) {
-                        Text(
-                            stringResource(
-                                if (listening) R.string.radar_cw_stop else R.string.radar_cw_start
-                            )
-                        )
+                    if (!listening) {
+                        Button(
+                            onClick = { startPanelCapture() },
+                            modifier = Modifier.weight(1f)
+                        ) {
+                            Text(stringResource(R.string.radar_cw_start))
+                        }
+                    } else {
+                        Button(
+                            onClick = { stopPanelCapture() },
+                            modifier = Modifier.weight(1f)
+                        ) {
+                            Text(stringResource(R.string.radar_cw_stop))
+                        }
                    }
                    OutlinedButton(
-                        onClick = { onAction(RadarAction.CwReset) },
+                        onClick = { decoder.resetDecoder(); waterfall.reset() },
                        modifier = Modifier.weight(1f)
                    ) {
                        Text(stringResource(R.string.radar_cw_reset))
                    }
                }

-                // Detected tone is read-only: the model analyses a fixed
-                // 400-1200 Hz window, so there is no pitch to configure.
-                if (listening) {
-                    Text(
-                        text = stringResource(R.string.radar_cw_tone, cw.cwToneFreq.toInt()),
-                        fontSize = 12.sp,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant
-                    )
-                }
-
                Box(
                    modifier = Modifier
                        .fillMaxWidth()
-                        .height(150.dp)
+                        .height(90.dp)
                        .clip(RoundedCornerShape(8.dp))
-                        .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.4f))
+                ) {
+                    CwPanelWaterfallView(state = waterfall)
+                }
+
+                Text(
+                    text = decodedText.takeLast(120),
+                    fontSize = 14.sp,
+                    fontFamily = FontFamily.Monospace,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    maxLines = 2,
+                    overflow = TextOverflow.Ellipsis,
+                    modifier = Modifier.fillMaxWidth()
+                )
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
                ) {
                    Text(
-                        text = cw.decodedText.ifEmpty {
-                            stringResource(R.string.radar_cw_waiting)
-                        },
-                        modifier = Modifier
-                            .fillMaxSize()
-                            .verticalScroll(rememberScrollState())
-                            .padding(8.dp),
-                        fontSize = 14.sp,
-                        fontFamily = FontFamily.Monospace,
-                        color = MaterialTheme.colorScheme.onSurface
+                        text = if (listening) "● ACTIVE" else "○ IDLE",
+                        fontSize = 12.sp,
+                        color = if (listening) Color(0xFF4CAF50) else MaterialTheme.colorScheme.outline
+                    )
+                    Text(
+                        text = "LEVEL ${(signalStrength * 100).roundToInt()}%",
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
                    )
                }
            }
@@ -804,3 +862,170 @@ private fun transceiverTitle(radio: SatRadio): String {

 private val FREQ_ADJUSTMENTS =
    listOf(-10_000L to "-10k", -1_000L to "-1k", -100L to "-100", 100L to "+100", 1_000L to "+1k", 10_000L to "+10k")
+
+// --- CW panel components (fldigi engine, pure Compose) ---
+
+/** Microphone capture at 8000 Hz mono PCM float (fldigi sample rate). */
+private class CwPanelMicCapture {
+    private val sampleRate = 8000
+    private val channelConfig = AudioFormat.CHANNEL_IN_MONO
+    private val audioFormat = AudioFormat.ENCODING_PCM_FLOAT
+
+    fun audioFlow(): Flow<FloatArray> = flow {
+        val bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)
+            .coerceAtLeast(sampleRate / 5)
+        val recorder = AudioRecord(
+            MediaRecorder.AudioSource.MIC,
+            sampleRate,
+            channelConfig,
+            audioFormat,
+            bufferSize * 4
+        )
+        try {
+            recorder.startRecording()
+            val chunkSize = sampleRate / 10
+            val buffer = FloatArray(chunkSize)
+            while (currentCoroutineContext().isActive) {
+                val read = recorder.read(buffer, 0, chunkSize, AudioRecord.READ_BLOCKING)
+                if (read > 0) {
+                    emit(if (read == chunkSize) buffer.copyOf() else buffer.copyOfRange(0, read))
+                }
+            }
+        } finally {
+            recorder.stop()
+            recorder.release()
+        }
+    }.flowOn(Dispatchers.IO)
+}
+
+/** Sliding spectrogram ring buffer for the CW waterfall. */
+private class CwPanelWaterfallState {
+    private val columns = 120
+    private val rows = 48
+    private val data = FloatArray(columns * rows)
+    private val pending = ArrayList<Float>(4096)
+    private val fftWindow = 512
+
+    /** Monotonic frame counter — reading this in composition triggers redraw. */
+    private val _version = androidx.compose.runtime.mutableIntStateOf(0)
+    val version: androidx.compose.runtime.State<Int> = _version
+
+    @Synchronized
+    fun pushSamples(samples: FloatArray) {
+        pending.addAll(samples.toList())
+        var frames = 0
+        while (pending.size >= fftWindow) {
+            val window = FloatArray(fftWindow) { pending[it] }
+            repeat(fftWindow) { pending.removeAt(0) }
+            val spectrum = computeSpectrum(window)
+            for (r in 0 until rows - 1) {
+                System.arraycopy(data, (r + 1) * columns, data, r * columns, columns)
+            }
+            for (c in 0 until columns) {
+                val bin = c * spectrum.size / columns
+                data[(rows - 1) * columns + c] = spectrum[bin.coerceAtMost(spectrum.size - 1)]
+            }
+            frames++
+        }
+        if (frames > 0) _version.intValue++
+    }
+
+    private fun computeSpectrum(window: FloatArray): FloatArray {
+        val n = window.size
+        val re = FloatArray(n)
+        val im = FloatArray(n)
+        for (i in 0 until n) {
+            val w = 0.5 - 0.5 * kotlin.math.cos(2.0 * Math.PI * i / (n - 1))
+            re[i] = window[i] * w.toFloat()
+        }
+        var j = 0
+        for (i in 1 until n) {
+            var bit = n shr 1
+            while (j and bit != 0) { j = j xor bit; bit = bit shr 1 }
+            j = j xor bit
+            if (i < j) {
+                val tr = re[i]; re[i] = re[j]; re[j] = tr
+                val ti = im[i]; im[i] = im[j]; im[j] = ti
+            }
+        }
+        var len = 2
+        while (len <= n) {
+            val ang = -2.0 * Math.PI / len
+            val wRe = kotlin.math.cos(ang).toFloat()
+            val wIm = kotlin.math.sin(ang).toFloat()
+            var i = 0
+            while (i < n) {
+                var curRe = 1f
+                var curIm = 0f
+                for (k in 0 until len / 2) {
+                    val uRe = re[i + k]
+                    val uIm = im[i + k]
+                    val vRe = re[i + k + len / 2] * curRe - im[i + k + len / 2] * curIm
+                    val vIm = re[i + k + len / 2] * curIm + im[i + k + len / 2] * curRe
+                    re[i + k] = uRe + vRe
+                    im[i + k] = uIm + vIm
+                    re[i + k + len / 2] = uRe - vRe
+                    im[i + k + len / 2] = uIm - vIm
+                    val nRe = curRe * wRe - curIm * wIm
+                    val nIm = curRe * wIm + curIm * wRe
+                    curRe = nRe; curIm = nIm
+                }
+                i += len
+            }
+            len = len shl 1
+        }
+        val bins = 48
+        val out = FloatArray(bins)
+        for (k in 0 until bins) {
+            out[k] = kotlin.math.sqrt(re[k] * re[k] + im[k] * im[k]) / n
+        }
+        return out
+    }
+
+    @Synchronized
+    fun getColumn(c: Int): FloatArray {
+        val col = FloatArray(rows)
+        for (r in 0 until rows) {
+            col[r] = data[r * columns + c.coerceIn(0, columns - 1)]
+        }
+        return col
+    }
+
+    @Synchronized
+    fun reset() {
+        data.fill(0f)
+        pending.clear()
+    }
+}
+
+@Composable
+private fun CwPanelWaterfallView(state: CwPanelWaterfallState) {
+    val columns = 120
+    val rows = 48
+    // Read the frame counter so the canvas redraws as new spectra arrive.
+    state.version.value
+    Canvas(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(Color(0xFF0D1B2A))
+            .clip(RoundedCornerShape(8.dp))
+    ) {
+        val cellW = size.width / columns
+        val cellH = size.height / rows
+        for (c in 0 until columns) {
+            val col = state.getColumn(c)
+            for (r in 0 until rows) {
+                val v = col[r]
+                val intensity = (v * 4000f).coerceIn(0f, 255f)
+                if (intensity > 6f) {
+                    val green = (intensity * 1.3f).coerceAtMost(255f)
+                    drawRect(
+                        color = Color(0f, green / 255f, 0f, 1f),
+                        topLeft = Offset(c * cellW, r * cellH),
+                        size = Size(cellW + 0.5f, cellH + 0.5f)
+                    )
+                }
+            }
+        }
+    }
+}
@@ -1071,13 +1071,6 @@ private fun CardCredits(modifier: Modifier = Modifier) {
                text = stringResource(id = R.string.prefs_outro_license),
                color = MaterialTheme.colorScheme.primary
            )
-            // AGPL-3.0 attribution for the vendored DeepCW model.
-            // See feature/cw/licenses/NOTICE.md for the full notice.
-            Text(
-                text = stringResource(id = R.string.prefs_outro_deepcw),
-                style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
        }
    }
 }
@@ -62,25 +62,12 @@ import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.feature.status.R as StatusR
 import java.util.Calendar

-/**
- * Map AMSAT status text to Material3 colorScheme colors.
- * Addresses PR #233 review: use colorScheme instead of hardcoded Color() constants.
- */
-@Composable
-private fun statusColorOf(statusText: String): Color {
-    return when {
-        statusText.contains("Heard", ignoreCase = true) && !statusText.contains("Not", ignoreCase = true) ->
-            MaterialTheme.colorScheme.tertiary // Active
-        statusText.contains("Telemetry", ignoreCase = true) || statusText.contains("Beacon", ignoreCase = true) ->
-            MaterialTheme.colorScheme.tertiaryContainer // Telemetry
-        statusText.contains("Not Heard", ignoreCase = true) ->
-            Color(0xFFDC267F) // NotHeard pink (no semantic slot)
-        else ->
-            MaterialTheme.colorScheme.error // Conflict
-    }
-}
-
-private val NoReportGray = Color(0xFFC0C0C0) // Neutral state
+// ========== Official status colors (amsat.org/status originals) ==========
+val ActiveBlue = Color(0xFF648FFF)
+val TlmOrange = Color(0xFFFFB000)
+val NotHeardPink = Color(0xFFDC267F)
+val ConflictDeepOrange = Color(0xFFFE6100)
+val NoReportGray = Color(0xFFC0C0C0)

@Composable
 fun SatStatusScreen(container: IMainContainer) {
@@ -210,10 +197,10 @@ private fun StatusHeader(
@Composable
 private fun LegendRow() {
    val legend = listOf(
-        stringResource(id = R.string.amsat_active) to MaterialTheme.colorScheme.tertiary,
-        stringResource(id = R.string.amsat_tlm) to MaterialTheme.colorScheme.tertiaryContainer,
-        stringResource(id = R.string.amsat_not_heard) to Color(0xFFDC267F),
-        stringResource(id = R.string.amsat_conflict) to MaterialTheme.colorScheme.error
+        stringResource(id = R.string.amsat_active) to ActiveBlue,
+        stringResource(id = R.string.amsat_tlm) to TlmOrange,
+        stringResource(id = R.string.amsat_not_heard) to NotHeardPink,
+        stringResource(id = R.string.amsat_conflict) to ConflictDeepOrange
    )
    Row(
        modifier = Modifier.fillMaxWidth().padding(vertical = 2.dp),
@@ -262,10 +249,9 @@ private fun HeaderRow(statuses: List<SatStatus>) {
    }
 }

-/** Satellite row: name + 6 day color blocks (displays the newest non-gray status) */
+/** Satellite row: name + 6 day color blocks (official colors + report counts) */
@Composable
 private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
-    val noReportGray = 0xFFC0C0C0L
    Row(
        modifier = Modifier
            .fillMaxWidth()
@@ -280,7 +266,7 @@ private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
            modifier = Modifier.weight(2f).padding(start = 4.dp)
        )
        status.days.forEach { day ->
-            val slot = day.slots.firstOrNull { it.statusColor != noReportGray } ?: day.slots.first()
+            val slot = day.slots.firstOrNull { it.statusColor != NoReportGray.value.toInt().toLong() } ?: day.slots.first()
            DayCell(
                slot = slot,
                modifier = Modifier.weight(0.8f).padding(horizontal = 1.dp),
@@ -365,6 +351,12 @@ private fun ReportDialog(
    )
 }

+private fun statusColorOf(statusText: String): Color = when {
+    statusText.contains("Heard", ignoreCase = true) && !statusText.contains("Not", ignoreCase = true) -> ActiveBlue
+    statusText.contains("Telemetry", ignoreCase = true) || statusText.contains("Beacon", ignoreCase = true) -> TlmOrange
+    statusText.contains("Not Heard", ignoreCase = true) -> NotHeardPink
+    else -> ConflictDeepOrange
+}

 private fun formatFetchedAt(utcMs: Long): String {
    val cal = Calendar.getInstance()
@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "458"
+appVersionCode = "459"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.5.5"
+appVersionName = "4.5.6"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry
@@ -34,7 +34,6 @@ kotlin = "2.4.10"
 kotlin-coroutines = "1.11.0"
 kotlin-serialization = "1.11.0"

-other-onnxruntime = "1.25.1"
 other-okhttp = "5.4.0"
 other-osmdroid = "6.1.20"

@@ -78,8 +77,6 @@ kotlin-gradlePlugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", ve
 #noinspection UnusedVersionCatalogEntry
 kotlin-serialization = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlin-serialization" }

-#noinspection UnusedVersionCatalogEntry
-other-onnxruntime = { module = "com.microsoft.onnxruntime:onnxruntime-android", version.ref = "other-onnxruntime" }
 #noinspection UnusedVersionCatalogEntry
 other-okhttp = { module = "com.squareup.okhttp3:okhttp", version.ref = "other-okhttp" }
 #noinspection UnusedVersionCatalogEntry
Author	SHA1	Message	Date
mckero	c42e1d7b4e	fix(wavelog): send real ADIF band + sat_mode, not the illegal "SAT" Satellite QSOs uploaded with BAND=SAT, which is not a legal ADIF Band enumeration value (the legal values are concrete bands: 160M/80M/.../ 2M/70CM/23CM...). Loggers that fail to parse an unknown band fall back to a default — observed as QSOs landing in 160m. SAT is only legal as PROP_MODE (propagation mode), which is already sent for v1. Changes (WaveLogApi): - bandFromHz(): map TX frequency to the real ADIF band (2M for VHF, 70CM for UHF, etc.) - satModeFrom(): derive the ADIF SAT_MODE convention string from TX/RX bands ("V/U" = VHF up / UHF down, "U/V", "V/S", "U/S"...; empty for same-band links) - v2 JSON: band=<real band>, add sat_mode when non-empty - v1 ADIF: <band:> real band, add <sat_mode:> when non-empty; PROP_MODE=SAT kept Verification: - New tests: SO-50 (145.850 up / 436.795 down) -> band 2M, sat_mode V/U; AO-73 (435.150 up / 145.950 down) -> band 70CM, sat_mode U/V; same-band -> empty sat_mode; satellite freqs never map to 160M. - All wavelog payload tests + full domain suite green.	2026-08-09 07:48:15 +00:00
mckero	09ebf1f39a	feat(cw): add spectral auto-tune so the decoder finds the CW tone The fldigi port ran a fixed 600 Hz NCO, so any real signal not inside 600±75 Hz (the 150 Hz filter passband) decoded nothing — the decode rate was effectively zero unless the tone happened to be on frequency. This mirrors the behaviour of the removed channelTracker: a sliding spectral peak detector now steers the NCO to the strongest tone. Changes: - Collect raw input, run a 512-pt Hann-windowed FFT every frame, find the strongest bin in 300..1500 Hz (CW range), smooth-track it. - First strong peak locks immediately (no RX reset, so the triggering element survives); later large jumps (>120 Hz) retune and reset the fldigi state machine; small drifts are eased at 20%. - Absolute energy floor (peak < 30) so silence/noise never steers. - estimatedPitch now reflects the tracked tone frequency. Verification: - New unit test: 900 Hz "CQ" with decoder initialized at 600 Hz decodes correctly and pitch moves to ~900 Hz. - All 9 decoder tests pass; full domain/cw/radar test suites green.	2026-08-09 05:04:48 +00:00
mckero	ec40f29f28	fix(cw): make the waterfall redraw as new spectra arrive The waterfall backed its pixels with a plain FloatArray and never signalled Compose, so the Canvas drew once (empty) and stayed frozen — no spectrum ever appeared. Add a monotonic frame-counter State that pushSamples bumps per FFT frame; the Canvas reads it in composition to trigger redraws. Also switch to log-ish intensity scaling so quiet bins stay dark while strong CW tones pop, matching the DeepCW look. Applies to both the CW decode screen and the radar transceiver panel.	2026-08-08 15:04:12 +00:00
mckero	5dd7a35a23	fix(cw): remove unused legacy drawables that fail release resource linking ic_baseline_delete/pause/save/share_24.xml were leftovers from the Morse Expert View-based UI. They reference ?attr/colorControlNormal which does not resolve in the release variant (no Material dependency in feature:cw), breaking assembleRelease. The new Compose UI uses icons from core:presentation, so these files are dead code.	2026-08-08 14:45:10 +00:00
mckero	4b835bac5c	feat(cw): replace reversed Morse Expert engine with a pure-Kotlin fldigi port Background: The CW decoder previously shipped a decompiled copy of the proprietary Morse Expert 1.15 (com/ve3nea/morse_expert + obfuscated classes, libnativedecoderjni.so, suncompat black-magic) — a copyright liability. This removes all of it and reimplements the decoder on the open-source fldigi (GPL v3) CW engine as a faithful pure-Kotlin port with no JNI. Changes: - Delete all Morse Expert reverse-engineered code: MainActivity, obfuscated packages (B/B0/D/E2/...), suncompat/, pas/nativedecoder, armeabi-v7a libnativedecoderjni.so, and the original View-based layouts (activity_main, cw_panel_main, options_menu). - Add a full fldigi CW pipeline in core/domain/cw: - CwFldigiDsp: NCO down-conversion, FFT filter, movavg constants - CwFftFilt: overlap-add FFT band-pass filter (fftfilt port) - MorseTable + SomTable: full Morse code table + SOM codebook - CwFldigiDecoder: decode_stream AGC + hysteresis, state machine, adaptive speed tracking (5-55 WPM), SOM winner/normalize matching - Rewrite CwDecodeScreen as pure Compose (DeepCW-style waterfall, live decode line, history, status cards) and CwSettingsDialog (speed/bandwidth/SOM) with no View interop. - Replace the Morse Expert panel in TransceiversPage with a Compose panel driving the same decoder; mic capture at 8000 Hz. - Drop the forced armeabi-v7a abiFilters now that no native lib exists. Verification: - 8 unit tests pass (CQ/HELLO at 18-20 wpm, A-J at 30 wpm with adaptive tracking, dot/dash/Farnsworth edge cases) — all decode correctly from synthesized CW. - :feature:cw and :feature:radar compile; app assembleDebug succeeds. - APK contains no ve3nea/nativedecoder/morse_expert classes.	2026-08-08 13:58:19 +00:00