Radio Signal Decoder

Real-time Radioteletype signal decoder from microphone

RTTY Output

0 chars

Audio Analysis

Spectrum

click & drag to tune
Mark: 275 HzSpace: 725 HzSideband:

Spectrogram

S
M

Decoder Sessions

● active
Sideband
No output yet…
How to Use
  1. Click "Start Decoding" to begin capturing audio from your microphone
  2. Tune your radio to an RTTY signal (typically 45 or 50 baud, 170 or 450 Hz shift)
  3. On the Spectrum panel, click and drag to position the M (mark) and S (space) markers over the two signal peaks
  4. Adjust Carrier Shift and Baud Rate in the configuration panel to match the transmission
  5. Use Add Decoder to run multiple decoders simultaneously with different settings — promote the best one to take over the main output
  6. Decoded text will appear in the terminal output area as characters are received
  7. Click "Copy Text" to copy the decoded output to clipboard

Tip: On the spectrogram, an RTTY signal appears as two persistent vertical lines — align the M/S markers with those lines using the spectrum panel.

Privacy

This application runs entirely in your browser. No audio data or decoded text is ever transmitted to any server.

The microphone permission is only used to capture and process the audio signal in real-time for RTTY decoding using the Web Audio API.

Your privacy is fully protected — we don't collect, store, or transmit any of your data.