Chad,

I don't have AIM, but you can PM me if you want.

The 9C does PPM and PCM, regardless of whether you get a crystal module or synth module for it. The receiver doesn't care which module the TX is using. If you get a PPM RX, you need to put the 9C in PPM mode... if you get a PCM RX, you need to put the 9C in PCM mode. I have both PCM and PPM RXs in my RC aircraft, and fly them all with my 9C.