RE: JR transmitter / Hitec Receiver compatible?
On 72 Mhz JR and Airtronics use positive shift, Hitec and Futaba use negative shift. This only works for fm (ppm) modulation. Each radio manufacturer uses different encoding for PCM modulation. Outside of USA, we use frequencies other than 72mhz. On PPM they work with each other in my experience. I am not a radio tech, so further input from qualified persons would be welcome.