ORIGINAL: carrellh
PCM is not related to having multiple model memory or programming (other than fail safe).
It is a coding method for the signal that is sent to the receiver. All Futaba PCM transmitters can transmit in PCM mode or PPM mode. If you want to use PCM receivers, you MUST use Futaba. No other brand will work.
If you use PPM, any negative shift PPM receiver (often incorrectly just called "FM") will work.
Is your current Futaba receiver model RxxxDP or RxxxDF?
If it is RxxxDP it is a PCM receiver. RxxxDF is PPM.
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Most Futaba transmitters (maybe all) can be switched from PCM to PPM (FM) via software toggles. You just have to remember to switch it back to PCM before flying the original PCM receiver.
Ed Cregger