I'm trying to put together a buddy box using two Futaba FM Conquest radios (FP T6NFK). The two radios have different TX frequency crystals. When I connect via the appropriate cable hooking the radios together, the radio that matches the receiver crystal moves the planes control surfaces as it should. However, the radio that is the slave, with the different TX crystal fails to operate the surfaces. I have the switches on both radios set the same. Am I on the wrong track with this idea? Should I have the same crystal in both radios? Can anyone tell me what I'm doing wrong? Any ideas. Thanks