Patent ID: 8031045

Claim:
An RF automatic-set-up redundant sensing switch, comprising: a first signal input for a first signal and a second signal input for a redundant second signal; comparator means to compare the relative strength of the first and second signals to one another; a signal output, the signal output outputting either the first signal or the second signal; selection means to select and output either the first signal or the second signal based on the relative strength of the first and/or second signal to one another; a differential amplifier that inputs values for the first and second signals, and outputs a value indicating the difference between the first and second signal; a first comparator that inputs the output of the differential amplifier and compares it to a predetermined lower threshold value, the first comparator outputs a signal that indicates when the output of the differential amplifier is above the lower threshold value; a second comparator that inputs the output of the differential amplifier and compares it to a predetermined upper threshold value, the second comparator outputs a signal that indicates when the output of the differential amplifier is below the upper threshold value; and a logic circuit that inputs the output of the first and second comparators, the logic circuit switches the output signal between the first signal to the second signal unless the differential amplifier is below the lower threshold or above the upper threshold; whereby the sensing switch outputs the selected first or second signal having the best signal strength.