I just wanted to agree that using coax feeders for power as well as rf can lead
to noise. I have a lot of beverages and other receive antennas, some of which
are thousands of feet from the shack, and I also use (probably unnecessarily
complex) switch units. This has meant that I have had to use 48V to ensure
reliable switching. I use CATV hardline for the 'main' lines and flooded RG6
for 'local' lines.
I have never had problems on the hardline, but the RG6 has often been noisy. I
am of the opinion that this happens at F connections even when the joint is
very well prepared and sealed, but this is so far unproven...
73 Roger
VE3ZI
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