Signals

To identify unknown signals, SigidWiki is a good starting point.

Slow Scan TV is used to send images over radio signals.

Using a tool like qsstv for Linux or RX-SSTV for Windows, the signals can be decoded.

To decode morse signals, this decoder can be used.

To decode DTMF tones, the following tools can be used.

• dtmf-decoder, Python cli tool to decode DTMF tones.
• Detect DTMF Tones, online decoder.