We have a masthead amplifier on our outdoor TV antenna to improve reception, with a power unit indoors that sends +12v DC up the antenna cable to power it. But whenever a TV is connected to the antenna cable in the living room, all other TVs in the house go off and the PSU shows a red light instead of green. I just checked with a multimeter, and the masthead is sending the +12v straight back down into the living room instead of the signal! The other TV points in the house show no voltage on the antenna cable.
The amplifier is designed to accept power from any of the TV points in the house, but it should not be sending the power straight back down into one of the TVs! Any idea how this happened? Has the masthead developed a fault, or did the installer get some wires crossed?
The amplifier is designed to accept power from any of the TV points in the house, but it should not be sending the power straight back down into one of the TVs! Any idea how this happened? Has the masthead developed a fault, or did the installer get some wires crossed?
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