Patent ID: 7986960

Claim:
A method of self-aligning a transmitting frequency between a portable transceiving device and a base station transceiving device, wherein the base station transceiving device is mounted in a vehicle for controlling a vehicle accessory function in response to messages broadcast between the transceiving devices, the method comprising the steps of: (a) transmitting a test signal from one of a portable or base station transceiving devices to the other of the portable or base station transceiving devices, the test signal having a frequency that varies during the transmission, the varying of the frequency of the test signal generating a plurality of discrete signals; (b) the other of the portable or base station transceiving devices measuring a RSSI value of each discrete signal; (c) the other of the portable or base station transceiving devices determining a discrete signal having a maximum RSSI value; (d) transmitting from the other of the portable or base station transceiving devices a test result signal identifying the discrete signal having the maximum RSSI value to the one of the portable or base station transceiving devices; and (e) transmitting at least a portion of a subsequent message from the one of the portable transceiving device or the base station transceiving device at an optimum frequency used for the test signal identified by the test result signal.