Patent ID: 7589615

Claim:
A security code transmission system comprising: a transmitter comprising: a source of a security code; rf transmission apparatus capable of transmitting at at least a first preset rf frequency and at least a second preset rf frequency; and control apparatus which obtains a security code from the source and controls the rf transmission apparatus to contemporaneously transmit portions of the obtained security code at both the at least the first and the second preset rf frequencies; and a barrier movement operator comprising: a receiving apparatus configured to select a signal from at least two signals being transmitted at the at least two different rf frequencies, the receiving apparatus including an antenna circuit for receiving the transmitted security code from the transmitter; a receiver configured to receive at the preset frequencies and which receiver receives the transmitted security code at the preset frequencies from the antenna circuit; and a controller which is operably coupled to the receiver, the controller configured to survey for the presence of the security code at the preset frequencies from the transmission apparatus, the receiving apparatus connected to the antenna circuit for receiving and validating the security code transmitted at the at least the first preset rf frequency and second preset rf frequency, the receiving apparatus being configured to select one of the first preset rf frequency and the second preset rf frequency based upon the reception of only a portion of the security code at either of the at least the first and second preset rf frequencies, the receiving apparatus being further configured to continue to detect a remaining portion of the security code at the selected one of the at least first and second preset rf frequencies as a default frequency to the exclusion of the other frequency for at least a complete reception of the security code and for a time thereafter.