Switching Crystals
There may or may not be any problems caused by changing the crystal in a TX, this is the reason for the FCC law. New receivers when they leave here are tuned to the center of the band, and you can put any crystal in the band and be set. It is a good idea to have them checked over from time to time anyway though, so if you are going to change the crystal, it is a good time to send in for a check up.