Hmm, my Airtronics radios don't work with Futaba and Hitec crystals, and am pretty sure vice versa. Don't have any JR transmitters to try but think they are the same as Airtronics AFAIK. My Airtronics has a thing to program pos. and neg shift on the transmitter. I had to use it once. Some transmitters actually could change frequencies, just before 2.4 came in. Now I just mostly use the cheap $6 Orange 2.4 receivers in my little planes. Cheaper and smaller than most crystal type receivers. But if that is all you got....