I agree with you that the RF ingression into the computer could be one one
or more wires, and I don't know which one(s).
My computer (Dell Precision 650) case is plastic, so I can't ground that. I
plan to unplug all the wires connected to the computer except for AC power,
video monitor, and keyboard and then turn on the transmitter and observe
what happens. As mentioned by one of the responders, I may want to test with
a keyboard connected via the PC keyboard jack. If the problem still
persists, add filters. I may even invest in a W3NQN AC-7 7 amp AC line
filter.
http://www.arraysolutions.com/Products/nqnaclinefilter.htm
John, N9JG
= = = = = Original message = = = = =
In addition to the other suggestions let me add there is no guarantee
which cable the RF gets into your computer on. You might have to filter
them all. The split cores are really handy and don't cost $9 a copy. For
sure start with the power cord. If it was me I'd do the offending
keyboard cable at the same time. Since it's 80 it might take more than
one core.
You didn't mention grounding. I found it necessary to include the
computer case in my station grounding setup. Not only did it reduce rfi
into the computer, it also reduced PC noise in the receiver. All chassis
go to a single common ground point, then outside to copperclad steel
rods. Since your shack is on floor2, you'll need a wide strap for a
ground bus to keep the L down.
It's normal to have a whole new experience on each band you have RFI. It
all depends on how friendly the RF path into your gear is.
Best wishes. If it was easy, nobody'd have RFI!
73 Art, k6xt
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