John - Why not do both, that is key the PTT and inject a tone into the audio, resulting in a MCW signal with no more duty cycle than a CW signal? I remember a lot of keyed FM signals on Oscar 7 the first time around. Lots of chirp accompanied by enthusiasm. :^)= - Duffey -- James Duffey KK6MC/5 Cedar Crest NM 87008 DM65