Direct RTL-SDR control
Connect a compatible receiver over Android USB Host / OTG. SPECTRA configures and reads the receiver locally without a network SDR or companion radio app.
01 / RADIO · ANDROID
AVAILABLE ON GOOGLE PLAYSPECTRA:
SDR / ADS-B
Radio, brought into focus.
A software-defined radio application for Android, built for compatible RTL-SDR receivers. Explore the live spectrum, scan frequencies, listen to supported modes and receive aircraft broadcasts locally.
SDRRTL-SDRADS-B receiver1090 MHz
01 / IN THE APP
See it in action.
A closer look at listening, scanning and local aircraft reception.
02 / CAPABILITIES
A receiver with room to explore.
Radio tools and aircraft reception, brought together in one Android app.
Spectrum & waterfall
See signal activity in a live spectrum with a scrolling history. Tap or drag to tune; pinch to zoom the viewport up to 16×. The displayed level is relative, not calibrated field strength.
AM, NFM & WFM
Demodulate the supported audio modes. WFM can provide stereo and decoded RDS text when the signal and receiver support them.
Favorites & station scan
Save frequency, mode and station name in Air, FM, Ham, PMR, Maritime, Space, Meteo or Other. Scan saved stations by category or together; Favorites stay on the device.
Range scanner
Set start and end frequencies, step, mode and squelch. It scans sequentially, can hold on signal activity, and lets you stop, skip, resume or save the current frequency.
Local WAV recording
Save demodulated AM, NFM or WFM audio as standard WAV files on the Android device. Recording is not available in the ADS-B profile.
Local ADS-B receiver
The 1090 MHz profile receives and decodes Mode-S / ADS-B on the device, with an aircraft list and live receiver diagnostics. Aircraft fields appear only when they are decoded from received messages.
Offline worldwide map
Explore the world with bundled offline geography from Natural Earth and 72,393 airport records from OurAirports. SPECTRA displays aircraft positions decoded locally from valid ADS-B CPR messages received through your RTL-SDR hardware.
No internet connection, no online aircraft feed, and no predicted aircraft positions. Just real received signals and offline mapping.
Built to work on-device
Radio capture, audio, ADS-B decoding and map drawing happen locally. Normal receiver workflows need no account, cloud SDR service, required Internet connection or online map tiles.
The app is landscape-first. Audio reception is limited to AM, NFM and WFM; SPECTRA does not claim to decode arbitrary digital voice or data protocols.
READY TO RECEIVE
Bring your own radio.
SPECTRA needs an Android device with USB Host / OTG support, a compatible RTL-SDR receiver and a suitable antenna. Exact tuner and device compatibility can vary. Android 10 or later is required for the documented WAV save location.
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