mckero
4cb03111bc
With tone shift off and the operator tuned outside 400-1200 Hz, the page did not go quiet - it went confidently wrong. Three measurements, all reproduced against the real spectrogram path: estimatedPitch is (32 + loudestBin) * 12.5 - shiftHz with the bin confined to 0..64, so with no shift applied it can only ever report 400-1200 Hz. It cannot express 1500 Hz, and it does not try: it publishes whichever window edge the leakage piles against. For a 1500 Hz tone that is 1200 Hz. That leakage is not faint. The waterfall normalises to the loudest value on screen, so 50 of 65 bins clear the 0.06 draw threshold and the picture shows a keyed-looking column pinned to the right edge - the 1200 Hz column runs 25 times the 400 Hz one. signalStrength is prominence over the window mean, so the same leakage scores 0.78 and paints the meter to 78% of full width. So the operator got a strong-signal bar, a plausible 1200 Hz readout, a picture that looked like a signal, and an empty transcript, with nothing saying why. The scan that can see past the window now runs whether or not shifting is enabled - it is the only measurement that can - and publishes through a new detectedToneHz flow kept separate from estimatedPitch. Overloading the latter is what let the 1200 Hz claim out in the first place, so the two meanings stay in two flows. The shift decision still only happens when the setting is on. Cost is one 121-bin scan every 2 s. The meter now reads zero when a tone is out of range and not being shifted in: it is a claim that something decodable is present, and in that state nothing is. A line under the waterfall says which case the operator is in - the tone was moved in, or it is out of range and tone shift is off, naming the frequency and the remedy. Strings in all nine locales; feature:cw only had five, so values-es, values-ru, values-si and values-uk are new, with the Turkish apostrophe escaped. CwToneShifterTest pins the premise the hint rests on: that the scan reports tones the model window excludes, at 120, 250, 1400 and 1500 Hz.
Look4Sat: Satellite tracker
Radio satellite tracker and pass predictor for Android, inspired by Gpredict
Track satellite passes with ease!
Thanks to Celestrak and SatNOGS you have access to over 9000 active satellites.
You can search the entire database by NORAD Catalog Number or the satellite's name.
Orbital positions and passes are calculated relative to your location.
To get reliable data make sure to set the station position via the app Settings.
The application is built using Kotlin, Coroutines, Jetpack Compose and Navigation.
It is now and always will be completely ad-free and open-source.
Main features:
- Predicting satellite positions and passes for up to 10 days
- Showing the list of currently active and upcoming satellite passes
- Showing the active pass progress, polar trajectory and transceivers info
- Showing the satellite positional data, footprint and ground track on the map
- 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
The Look4Sat application code is licensed under the GNU General Public License v3.0.
The CW decoder in feature/cw bundles the DeepCW
neural decoding model, licensed under the GNU Affero General Public License v3.0 only
(AGPL-3.0-only). Because the combined work incorporates an AGPL-3.0 component, the
combined work is distributed under the
GNU Affero General Public License v3.0 — GPL-3.0 Section 13 permits the
combination, and AGPL-3.0 Section 13 applies to the combined work as a whole.
Model provenance and attribution are documented in
feature/cw/licenses/NOTICE.md; the original GPL-3.0
text is preserved at feature/cw/licenses/Look4Sat-GPL-3.0.txt. The CW model runs
locally on-device and does not provide services over a network.