Bill,

In my opinion, toss the PCM. In my fleet of 25+ gas powered reserch planes, I NEVER run PCM. PCM hides too much. I lost a couple of planes to PCM hold a few years ago and then I decided to toss the PCM. I have not lost a plane since to rx interference problems since. I use exclusively FMA receivers (Quantums) which I have found to be the best on the market for rejection of off frequency interference. We require a robust RX because we also carry a 1.5 watt 400 mhz tx on board the planes. In our application, Airtronics, Futaba, Hitec and JR just could not deal with the 1.5 watt TX onboard.

Elson