The RX is like the radio in your car, you can adjust it to get the channel you like, without creating problems for others. The transmitter is another story. Your agreement on purchase is for the specified channel{unless moduler or synthesised} which are designed to keep in tune as the channel is changed. If you start changing things on your own, you can deal with unhappy fliers at your field and the men in suits, from the FCC. How many of us remember the 70's when pirate radio stations where the rage. Back then it was a hand slap and confescation of your equipment, now it would probably be conscrewed as an act of terriorism.{ this last statement is ment to be humoress, not an act of agression or to be polliticlly volitale}.