On 10/17/2010 7:38 AM, K1TTT wrote:
> I would try swapping it with one that doesn't make the noise and see if the
> noise follows it.
Yes, I would suspect a bad GFCI, which is quite common. BUT -- there
might also be a wiring error. Carefully check that all the colors are
correct on every outlet, not only on that bad one. If that isn't the
problem, replace the bad one.
> otherwise maybe some ferrites on the romex would reduce the level enough.
Yes, that might help. BUT -- you will need multiple turns through the
ferrite to make a dent. Study my measured data in
http://audiosystemsgroup.com/RFI-Ham.pdf to see what it takes to move
the resonance of the choke to the TX frequency(ies) where you are having
problems.
> Or even plug in a power strip with a line filter and see
> if that reduces the signal level enough to stop the noise.
That is as likely to CAUSE a problem as to fix it. A GFCI works by
sensing the balance between current in the black wire and the current in
the white wire. When that difference exceeds about 5mA, it trips. That
difference is the result of leakage current, which is due to
capacitance. Adding a line filter will add capacitance, which will make
the breaker more likely to trip.
73, Jim K9YC
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