Pass through antenna selection signals to detect antenna changes and trigger retuning. For instance, i have up to 48 (6 bands * 8 control lines) relay control lines from my antenna selection boxes. The amp would remember which combination of antennas and bands it had been tuned for and return to those settings or if it had never been used before force a new tuneup. this would have to be very generalized since i use +12vdc controls, others may use +/- 12v rectified ac, or selections that are grounded on activation, etc.
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