RE: JR / Futaba TX ??? (Not again)
In the US market, on 72 mhz, JR transmitters will NOT communicate with Futaba receivers. Don't understand the 'shift stuff' (don't care enough to learn) but I know it doesn't work between these two brands. So, if you buy a JR transmitter you'll need a JR receiver and crystal for your existing plane.
OR, just use the Futaba with the existing plane and JR with any new ones.