But it comes in either PCM and FM, the FM is about 50 bucks cheaper. All I fly are slimer planes.
as someone else mentioned, pcm and fm have nothing to do with each other. compare fm and am, or compare pcm and ppm.
anyway, back to the post. what you are seeing there is which RX comes with the transmitter. that transmitter, and any modern pcm transmitter, is always capable of transmitting ppm data also.