Changing tx/rx crystals
StaggerWing,
In the USA there are only two ways that the owner of a TX can legally change his/her freq that I know of. A licencsed Ham operating on the 50Mhz band or owning a 72Mhz band radio that is designed to be changed by the user such as the Hitec Spectra module equiped radios.
I do believe that unless you fall into either of these two catagories that any such modification is against FCC regulations