The 50MHz Module is for use by licensed HAM Radio Operators. IT is against FCC regulation to change crystals in this module to change channels. To change your Tx channel purchase a module on the proper channel or send this module for service to retune. The FUTL17(used in the 9VA or 9VH) can be used as a substitute for this module, but the FUTL15 is not powerful enough to work in the 9VA or 9VH radios. Antenna must be extended to avoid damage to the module.