Prior to buying my (ultra-quiet) Mac G5, I experienced a significant
amount of noise from my PC....doing a search with a handheld shortwave
radio in AM mode revealed it was primarily emanating from the AC power
cable area.
Clip-on ferrite chokes on the power cable were completely ineffective.
I dismantled the computer, opened up the power supply and replaced the
power supply input connector (unfiltered) with a filtered one purchased
from Digi-key and the problem went away! Sorry, but I do not have the
part number...they are available from Digi-key, Mouser, Newark, etc, etc.
In the interest of maximizing profits the manufacturer omitted a
filtered input connector and let me instead buy it aftermarket.
John, N6AX
Alan D. Wilcox wrote:
Hello,
I gave away the feeble old PC I had by my radio equipment and replaced
it with a newer one ...
Now I have S9+ noise wiping out 20 and 30 meters.
Using same keyboard, mouse, monitor; just the PC in a new case.
Evidently it has a
noisy switcher supply in it. Tried 110V in-line filter, also different
110V house circuit,
but still have noise. Grounds don't help. Don't happen to have a box
of toroids for chokes.
I've got an old PC supply or two in the junk box, but hoping something
else might fix.
Any thoughts on an easy fix?
Thanks,
Alan
Alan D. Wilcox, W3DVX
570-321-1516
http://WilcoxEngineering.com
Williamsport, PA 17701
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