A couple of things...
I took Jim's advice and stocked up on #31 ferrites, bought a bunch of
them, more than I'll probably ever use but I'm going to put them on
every power outlet possible, I've already started making up extension
cords to be clamped with the ferrites and from that, to a power
strip. Where that's not practical, every wall wart will have turns of
the wire ferrited. You get the idea. The noise I hear and see on the
P3 is now remarkably reduced.
I've had more noise in my HI-Z Rx antenna than I think I should have
so I put these ferrite clamp-ons at each end of the coax (in loops)
to each antenna and at the end at the control box. Same for all the
other coax involved in the HI-Z and it has made a difference but I'm
really not sure why.
As to the Keurig & the Astron... I do love the Keurig, I use the
refillable coffee holders and it does make a fine cup but I digress.
As was mentioned earlier, the Astron was terribly made as regards
grounding. The wire grounding from the negative DC out was bolted to
the chassis but it was on paint on both sides and the round plug was
attached to the chassis exactly the same way. I connected both of
these ring terminals to one bolt and removed the paint on both sides
to make a true ground.
I tried figuring out what was making the hum in the Astron when the
Keurig was on and it seems to be coming from the transformer (which
is really warmer than I expected). I removed the DC connection and
just had the Astron plugged into the AC and I still was hearing that
intermittent humming when the Keurig was on. Nothing I could press on
in the PS made the noise stop. I finally put three large ferrite
clamp-ons with three loops each on the power cord to the Astron and
now I can still hear the hum but now it's greatly reduced and hard to
hear over the fan in the amp, so that is a real bit of progress.
73,
Gary
KA1J
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