Hello,

I am done building a UHF repeater out of 2 Motorola Maxtrac radios. I have the controller working. I want to add another function, auto morse code ID'er. I can inject the audio into the audio circuit (radio mic uses preamp, 100 ~ 200mv output). Besides using scaling resistors and capacitive coupling to get to 50mv (low volume ID). What is the best way to generate the dits and das? Use the PWM output to generate a base frequency of 1 ~ 2 Khz and interrupt it?

Nick