ORIGINAL: nonstoprc
Actually, a PCM receiver, when in false-safe mode, demonstrates the prsense of interference or a low battery situation. For the latter, I was able to detect a dead cell in a receiver pack while performing a ground test.
Probably it is not a good idea to use non-standard crystals? Personally, I only use new or professionally-checked crystals/receivers.
The clear advantage of PCM receivers (at least Futaba brand) is better noise (interference) handling, and longer range of reception. So why not use PCM receivers on high$$$ pattern ship for a mild amount of extra $$$?
--qc
You are missing the point on the crystals.
Firstly, I was unaware the original crystal was locally cut. It was supplied buy importer.
Secondly, the latest crash was with the Genuine crystal (I new my original post was too long and would get read in completion). The rationale was, the original crash WAS caused by a non genuine crystal, hence the idiotic confidence I had to retry with a GENUINE JR CRYSTAL. And of course, all ground checks, and indeed, 9 perfect flights. AND of course, after the crash, everything still works well.
Battery was new, recycled, tested, before and after. No Dead cells. AND it was a 5 cell anyway.
I honestly think it is better to see the glitch (PPM) than not, and at least have a chance to rectify the problem. With both my PCM failures, I never got a chance to, as it never came out of the lockout.