Another thing to check...are you working under or around flourescent lights? In my shop I have overhead multi-tube flourescent lights and I have one plane that the servos chatter when those lights are turned on. Turn the lights off and the chatter goes away. It is the only receiver (all on 72 mghz) that does this. If I remove the plane from the shop, the servos will not chatter. I think it is the ballast in the flourescent lights that is putting out interference.