a self - tuning duplicating transceiver is provided . the transceiver includes a microprocessor , a transmitter and a receiver . the transmitter includes an electrically tunable radio frequency oscillator , and the receiver includes a counter for determining an edge count associated with a received signal . the microprocessor is programmed to receive an unknown signal with the receiver and use the counter to determine the edge count thereof , and electrically tune the transmitter oscillator to a carrier frequency corresponding to the edge count for the unknown signal .