I need help for about 4 weeks now I have been tring to get my plane in the air but its failing the range check. The servos are jittering at about 75 feet. I have a tower hobbies "tower trainer" with futaba radio equipment. i have change the reciever and transmitter with no luck! I have tried one servo at a time and just about all of them will jitter. We have traded out batteries with out luck. Everybody at the club is out of ideas, so I thought I would take a shot in the dark.

Bernie

If this happening with the engine running then look for a loose muffler, loose metal to metal contact (there should be no metal to metal contacts anyway).

In all cases verify no bad extensions, no wires running right next to or going over the antenna, it could be a bad crystal

Try changing out your Crystals.... Make sure ant. is tight on TX. Then send them in for service..