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Had a strange problem on this past Sunday.
I was setting up a Raptor 30V2 for a buddy. All was going well, got the pitch curves, throttle curves, hold, etc. setup. Fire the heli up, take it to the Heli pad to test hover it and I notice as I am checking control input that the swash plate is Jittering.... Hugh?
I check that the trans is PCM ... yes it is... cut the motor and take the heli back to the trailer. Range check it again, range checks great.
The Owner of the Raptor just put this RCVR in the heli, he had just gotten it back from Futaba from a check up (check up good).
Now remember this is a PCM radio (9ZWII) using a 149DP rcvr.
I could turn the heli on, try to start the motor with out using the glow igniter on it and the swash plate would jump around just like an FM would do experiencing interference
Long story short, we replaced the RCVR with a new one and all was perfect.
So what could cause a PCM RCVR to Jitter?
Obviously the RCVR is bad.