Bruce you covered it completely. WOW!!!!! didn't know that. I guess I thought I could go from channel 57 to 52 if someone else was flying on that channel. Hummm.. Thanks for the info. What would happen someone did change crystals? What if going from say 57 (I don't know why I am picking on 57, I guess because I one a 57 Chevy) to say a low channel. Will it still work?