I was at the field 10/13/03 and one of the guys started getting hits and the plane was doing wild things and finally after a while it went in the ground. He said when he purchased the plane[RTf] it had a receiver for ch42 so he put 42 crystal in the radio, which was tuned for 38,how much problem would this cause. I know it is against FCC rules to do this. what does it do to the freq. when you change crystals in the transmitter.