US Patent 7376401 Frequency matching and optimization system for an RF receiver

A system for selectively changing the operating frequency of an RF receiver includes a receiver having a selection interface, and a frequency matching module removably attached to the barrier operator. After detecting an input on its selection interface, the receiver responsively changes its operating frequency from its current frequency to another frequency, as determined by the input. The frequency matching module then optimizes received signals of the same frequency as the receiver's operating frequency, thereby enhancing the receiver's range of signal detection.