[Elecraft] Computer Noise ruining 20 & 30m

[G4ILO]

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.
> 
It's very likely to be the power supply, especially if it is a home build or
a local PC store build rather than a branded model. Most of the PC cases and
power supplies that home builders and small assemblers use are made in
China, and the manufacturers often leave out all the components they can get
away with, like anything to do with interference suppression. I remember
someone a few years ago took apart a noisy power supply and could see all
the holes in the PC board where the suppression components should have been.
It was quite an eye opener.

Replace it with a power supply from a decent manufacturer and all should be
OK.

-----
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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