Adds a phosphor-persistence waveform scope showing audio RMS/peak
levels during ISS SSTV and General SSTV decoding, matching the
existing pager scope pattern with a purple color scheme.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
SSTV was not claiming/releasing SDR devices through the centralized
registry, so the device state panel always showed the device as idle
during SSTV use. Added claim_sdr_device/release_sdr_device on the
backend and reserveDevice/releaseDevice on the frontend, matching the
pattern used by all other modes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Users can now manage decoded SSTV images with download and delete actions
accessible from hover overlays on gallery cards, the full-size image modal
toolbar, and a "Clear All" button in the gallery header. Both ISS and
General SSTV modes are supported.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
slowrx is a GTK GUI app that doesn't support CLI usage, so the SSTV
decoder was silently failing. This replaces it with a pure Python
implementation using numpy and Pillow that supports Robot36/72,
Martin1/2, Scottie1/2, and PD120/180 modes via VIS header auto-detection.
Key implementation details:
- Generalized Goertzel (DTFT) for exact-frequency tone detection
- Vectorized batch Goertzel for real-time pixel decoding performance
- Overlapping analysis windows for short-window frequency estimation
- VIS header detection state machine with parity validation
- Per-line sync re-synchronization for drift tolerance
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Open Notify API (api.open-notify.org) is frequently unreliable,
causing 5-second timeout delays on every ISS position request.
Promote wheretheiss.at as the primary API in both satellite.py
and sstv.py, demoting Open Notify to fallback.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add DopplerTracker class using skyfield for satellite tracking
- Calculate and apply Doppler shift correction (up to ±3.5 kHz at 145.800 MHz)
- Background thread monitors shift and retunes rtl_fm when >500 Hz drift
- New /sstv/doppler endpoint for real-time Doppler info
- Start endpoint accepts latitude/longitude for automatic tracking
Also:
- Add slowrx installation to setup.sh (source build for macOS, apt for Debian)
- Sync observer location to dashboard-specific localStorage keys
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Fetch live ISS position from Open Notify API (primary)
- Fallback to "Where The ISS At" API if primary fails
- Remove dependency on potentially outdated local TLE data
- Calculate observer elevation/azimuth using spherical geometry
- Both APIs are free and don't require authentication
This fixes the issue where the ISS position was incorrect due to
the local TLE data being almost a year out of date.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add /sstv/iss-position endpoint that calculates ISS position directly
- Update JS to use new endpoint instead of /satellite/position
- Returns lat, lon, altitude, and optionally elevation/azimuth from observer
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
The test_client approach was failing silently. Now calculates ISS
passes directly using skyfield within the sstv route.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add slow-scan television decoder for receiving images from ISS.
Includes new Space dropdown in navigation grouping Satellite and SSTV modes.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
