The DRAKE AUX-7 auxiliary board is aplug-in option for the Drake R-7 and TR-7which allows the user to program up to 8 auxiliary 500 kHz frequency ranges forinstant selection from the front panel. In addition, a crystal socket isprovided for each of the eight ranges to allow fixed frequency operation withina selected range.

Each Range Receive Module RRM7 and Range Transmit ModuleRTM7 (on the TR7), must be programmed for a specific 500 kHz range. The programingis accomplished by removing pins in accordance with the programmingchart.