Hi there all,

Here I'm again with new questions which just popped up on my mind yesterday and Im thinking about it whether is it possible or not?

Question is JR's Tx model XP7202 is fully synthesized crystal free. The Rx comes with it is R790 Scan select PCM. PCM I understand is Pulse Code Modulation what are S-PCM, and Z-PCM, second thing, if Im using XP7202 with Fully synthesized Rx naturally whatever the frequency is not being used can be selected and used, but if Im using another Rx with a crystal on it and it is FM like its 72.810, is it possible that Fully synthesized Tx may work with an Rx which has crystal on it and has frequency of 72.810, do we have to select on 72.810 frequency on our Tx and it would communicate with Rx with crystal and work, or fully synthesized Tx would always work with fully synthesized Rx not with those having crystals. Sorry if it seems an unusual question but I wanted to have clarification cos, my second radio is JR's XP7202, and I would need more planes with naturally more Rx with crystals.

Thanks in advance

Mody