PCM
Gordon,
I regards myself as pretty well qualified to speak on the subject of PCM and PPM. But I am not going to as your explenation is exactly spot on. I hope folks take note of your very valid comment of PCM masking interference problems. PCM is my choice but not knowing when them glithes start to appear is a downside for me. Our BMT controller not only counts failsafes but also logs the exact time when they occured and how long each one lasted and is displayed in real time together with parameters like airspeed, throttle position, RPM, EGT, Batt Voltage and Rx voltage etc in a graphical form once downloaded from the ECU. This may very well give early warning and clues as to the origin of "locks"
Andre Baird