Chris you've been real helpful!

I hooked pu the 811s to my R700 last night (although my batteries hadn't been fully charged), and there wasn't a whole bunch of jittering just a little jittering, I figured that was noise that others had mentioned.

Then the thought came to me, maybe mine isn't greatly jittering because my radio isn't PCM, or is it, or does it even matter if it's PCM or FM with 811 digital servos? The box says XP8103DT FM, I would guess that means the TX is FM and not PCM. Would the R649 still be good thing, isn't the R649 for PCM only?