Signal Maker
Turn your words into a radio signal.
Type a message, pick a signal, and hear it the way it would sound on a radio, drawn live on a waterfall as it plays. You can download each sound too.
KZ9ZZZ is an unassigned example; a WSPR message holds only these three things.
0 Hz1,0002,0003,000 Hz
Morse code
Everything is made in your browser; nothing you type is sent anywhere. These sounds are for listening and learning. Putting any of them on the air requires an amateur radio license, and we don't offer emergency, distress or pager signals at all.