I need a buddy box to work with a JR 7202 TX. I would like to be able to teach some of my friends and family how to fly without having to wreck as many planes as I have. What exactly do I need. I'd like to keep it inexpensive.

Get a used JR Quattro and remove the crystal. This will work fine as long as you are using only four channels. If you your wing selection is "flapperons" a four channel box will not work. All this is, of course, assuming that the 7202 operates the same as the JR 6102. I'd call Horizon and verify before I bought.

Happy Landings