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 -- View this message in context: http://www.nabble.com/Computer-Noise-ruining-20---30m-tp14758232p14759124.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
