Live RF + DSP
AM, NFM, WFM, USB, LSB, and CW with squelch, AGC, and DSP filtering.
Local-first SDR listening
Clean SDR listening from your own rtl_tcp server.
CoronaSDR connects your iPhone to an RTL-SDR server on your LAN and gives you live spectrum, waterfall, multiple demod modes, and practical tuning controls without cloud dependency for radio data.
Compatible with `rtl_tcp` servers on Raspberry Pi, Linux, or macOS.
Built by Silviu YO6SAY
What you get
Spectrum + Waterfall
Real-time FFT and Metal-rendered waterfall with performance profiles.
Reliable audio path
Jitter-aware buffers, reconnect flow, and click-free retune transitions.
Station memory
Favorites, tags, and CSV/TSV import/export stored on device.
Advanced tuner controls
PPM, direct sampling, offset tuning, and bias-tee (hardware/server dependent).
Diagnostics
Throughput, buffer health, and performance traces for troubleshooting.
Quick setup
You need an RTL-SDR dongle and an `rtl_tcp` server reachable from your phone on the same LAN.
01
Start your SDR server
rtl_tcp -a 0.0.0.0 -p 1234
02
Connect from CoronaSDR
Enter your server host and port, then test connection.
03
Tune and listen
Pick mode, adjust gain and enjoy live spectrum + audio.