mckero
b95a86c97f
The FT-817 CAT frequency field is 4 BCD bytes at 10 Hz resolution, so the largest representable value is 999,999,990 Hz. encodeFrequencyBcd is exact below that, but for anything above it the %08d formatting silently drops the leading digit: 1,267.6 MHz encodes as 126.76 MHz. Verified against the release bytecode - 1,000,000,000 Hz -> [10 00 00 00] -> 100,000,000 Hz, ten times lower - and the SatNOGS catalogue has 17 transmitters with uplinks over 1 GHz (QO-100 at 2400.05 MHz, several 23 cm links), so the wrong value is reachable via RadioTrackingService when an FT-817 is mis-configured as the TX radio. The tracking loop's read-back then locks onto the wrong band with no warning. Reject out-of-range frequencies at setFrequency with a log and return false instead of sending a corrupted command. In-range values are unaffected (probe: 7.074/145.5/435.1 MHz and both 999,999,98x/99x MHz round-trip exactly; every value above the limit is refused before the encoder runs).
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.