Ah you just found your problem. I've been and done that. The spread spectrum GTB will not work right on any 27mhz or 75mhz radio. I went thur tring different radios and no luck. I sucked it up and bought a 2.4mhz and wow. It works great. Borrow a friends 2.4 to test. Somwwhere on Novak site it does say not to use with non 2.4 TX's