I had terrible noise in the powered positions, and quiet with no power in pos
4. My issue
was a animal chewing the coax jacket. The resulting corrosion created the many
little
diodes needed to make a broadband noise generator. If the noise is more like
birdies
rather than broadband, check the power supply and make sure there isn't some
noise
coming in that way, perhaps a bad diode or dried out cap. Putting a meter or
scope
(Or an AC coupled spectrum analyzer if you have one) on the connection going to
the
antenna can quickly show a major problem.
You may be able to use an ohmmeter to verify the dc integrity of the connectors
and
coax. (I have had my share of PL-259s that did not have good soldering braid to
shield.)
Mark n2qt
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