ORIGINAL: DaveShulman
Guy's,
We've figured out what happened - someone turned on (accidentally I hope).
We duplicated the exact scenario.
When you have a radio (JR10X) on and working, and add another radio on the same channel, at a reasonable distance away (to where it won't immediately swamp the original) and slowly bring the 2nd radio closer, once within range, the 1st radio goes into about 1/2 stick of down elevator before going into hold/failsafe. It's probably less than a second of input in the down elevator before holding.
If you do this and the 2nd radio is close by and swamps the signal, it goes into hold/failsafe immediately (without the down elevator).
[snip]
David,
That's really interesting. I'm assuming that the second radio must be a JR10X as well? I've done some limited experimenting with the Langley guy's 10X's and my own Futaba 9C's and I've generally found that those two types can actually work simultaneously on the same channel - although I'm sure that the effective range goes down.
There must be some scenario where the primary signal gets corrupted just enough to cause an erroneous packet to be received but decoded as OK by the RX. Or perhaps its a software (firmware) bug in the JR RX where rapid reception of alternating good and bad frames causes the processor to go into some "unknown state" where bad pulses are sent to the servos... I'd guess the latter case...
It would be nice if the JR folks could add some info. to this discussion...
Bob
Bob