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Has anyone successfully repaired the RCA TVPRAMP 1R by removing or by-passing the faulty switches?
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The only repair that I know of is the one by Pete Higgins that I suggested above.
What you have in mind could be done. I would first try a contact cleaner spray and leave the switch in the combined position. If that didn't work, I would solder in a jumper to make that permanent.
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Could the RCA TVPRAMP be mounted at the mast base (18ft) for easier access?
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Yes, it would cost you 1 or 2 dB loss of antenna gain, because of the coax loss.
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Would using a UVSJ and the PCT-MA2 at the mast base (18ft) instead of the RCA TVPRAMP produce comparable results?
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Probably, but I don't know about your distribution system after the preamp.
If you want to test the PCT amp at the base, you will need to have AC power for the transformer there and feed the DC into the upper left port. If you want to use the PCT amp like a preamp with the power from inside, you will use the lower left port for the power in AND the signal out. This will require a PCT-MPI-1G power inserter inside with the transformer. I can give you a diagram if you want it.