Patent ID: 7580696

Claim:
A method of self-aligning a transmitting RF 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 RF messages broadcast between the transceiving devices, the method comprising said steps of: transmitting a RF signal from one of a portable or base station transceiving devices to the other of the portable or base station transceiving devices, the RF signal having a frequency that varies during the transmission; measuring a RSSI value of a received RF signal at selected frequencies by the other of the portable or base station transceiving devices; transmitting each RSSI value of each varied frequency as measured by the other portable or base station transceiving devices to the one of the portable or base station transceiving devices; determining a respective frequency having a maximum RSSI value, the determination being made by the one of the portable or base station transceiving devices; and transmitting at least a portion of a subsequent RF message from the one of the portable transceiving device or the base station transceiving device using the respective frequency having the maximum RSSI value.