AFSK, as used in amateur radio modems today, uses the Bell 202 modem standard, which is 2-ary FSK https://en.wikipedia.org/wiki/Bell_202_modem https://en.wikipe

AFSK, as used in amateur radio modems today, uses the Bell 202 modem standard, which is 2-ary FSK https://en.wikipedia.org/wiki/Bell_202_modem https://en.wikipedia.org/wiki/Bell_202_modem Unfortunately, most folks on the VHF/UHF bands use FM radios with pre-emphasis and de-emphasis circuitry, so you would need to design a waveform that deals with those challenges.