Originally posted by mschwing
A PCM radio does not go to failsafe on the first glitch or missed frame it sees. They vary somewhat by brand but a certain amount of glitches can pass through to the servos before the receiver goes to failsafe. Any glitch counter should see and count those glitches. Once in failsafe mode, there are no glitches or missed frames and the glitch countr will not detect or count anything. It is before switching to failsafe that we are most concerned about, not during failsafe.
It was my understanding that the PCM receiver would use a checksum to determine that a frame is bad then supply the servo with the last good data until the data becomes good again or it goes into fail safe. That would mean the glitch counter would only see one bad pulse unless the receiver was going in or out of range. At any rate it seems to me that the glitch counter would miss a lot of the corrupted pulses.