RE: Tx Rx crystal/freq mystery
I would certainly like to know the "reason for the FCC regulation....", since transmitter crystals ARE interchangeable everywhere on the globe except in the US.
Hitec transmitters even have a slot in the battery compartment for a "spare crystal"..
There's nifty thumb recesses on the transmitter crystal slot, to permit easy removal.
Obviously Futaba and Hitec et al aren't changing a global design for the "odd-man out" US.