Thank you to Zoltán Dóczi (HA7DCD) from Z2Labs for writing in and sharing 'SatHunterSDR', a new satellite-hunting SDR receiver app for Android. You pick a satellite, the app tunes to it and follows its Doppler shift, and a sky radar turns with your phone to help point the antenna. Nearby satellites are also labeled on the waterfall at their Doppler-shifted frequencies.

The app works with RTL-SDRs (tested with our RTL-SDR Blog V3) and ESP32-S3 ESP-SDR devices over USB OTG, and includes CW, APRS, 9600 bd G3RUH telemetry and SSTV decoders. It's aimed at classrooms, so it can run with a simulated pass and no hardware, and students can write their own decoder plugins.

The code is open-source under GPLv3, with APKs available on GitHub. The plan is to create a STEM kit with the Spacewalker LNA 434 MHz, which has a Crowd Supply campaign coming soon.