I agree. A PCM receiver will reject some noise, but it will not ignore noise. If the magnitude of the RFI is high enough, a PCM receiver will become just as "swamped" as a PPM version. Either way, the results will be the same except that one will leave the controls in a locked position all the way to the ground. That's my reasoning behind setting up a gasser with a PPM receiver to locate and eliminate noise before installing a PCM receiver.