# AFSK

AI-generated

Audio frequency-shift keying:
data sent as a pair of audio tones through an ordinary voice radio’s
microphone and speaker connections.
Bell 202 is 1200 baud,
with mark at 1200 Hz and space at 2200 Hz.
[EAS SAME](../eas/index.html.md) uses its own variant.

## References

* [Bell 202 modem on Wikipedia](https://en.wikipedia.org/wiki/Bell_202_modem)