Scott,
The noise is only there AFTER I connect the antenna. So it has
something to do with the mains AC, coax run and the antenna...
if I recapitulate right, the noise is there when you:
1. power the RX from mains
2. connect the antenna
It looks to me that you create some kind of loop that picks up the
noise. The "loop" might be formed by the coax going to the antenna
---> the antenna earth ---> the protective ground of the mains.
There are 2 ways to check wether that is the case:
1. power the RX from battery and connect the mains protective ground
to the RX (metal case): now you should have the noise even when
running from battery
2. power the RX from mains and be sure to disconnect any other
grounding (eg at the antenna feeding point): now you should have no noise
73, Rik ON7YD - OR7T
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