Bell 202 is a modulation used in some old protocols. It uses FSK (frequency shift keying) at 1200 bits/s with two tones:
- 2200 Hz for a binary 0 (space)
- 1200 Hz for a binary 1 (mark)
The input box below generates and plays such a signal.
Bytes to transmit
Use hex digits 0-9 a-f. All other characters are ignored.