Unless there is something unusual about the existing power supply you could
consider replacing the supply with something like a good Antec or Cooler
Master unit. Online prices for 500W supplies are $50-$60.
This assumes that you are certain the noise is coming from the power supply.
I have never heard a peep from either of the brands mentioned above.
----------------- Wes Attaway (N5WA) -------------------
1138 Waters Edge Circle, Shreveport, LA 71106
318-797-4972 (Office) - 318-393-3289 (Cell)
Computer Consulting and Forensics
-------------- EnCase Certified Examiner ---------------
-----Original Message-----
From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com]
On Behalf Of Jim Brown
Sent: Wednesday, July 04, 2012 11:14 AM
To: topband@contesting.com
Subject: Re: Topband: Progress with ugly computer noise
On 7/4/2012 6:10 AM, Bill Cromwell wrote:
> Next I'll be getting my hands on some ferrite core materials and looking
to see just how far I can reduce the noise.
When faced with a noisy computer, the first thing I'd try (other than
replacing the noisy supply) would be a multi-turn choke on the power
cable, optimized (number of turns and core) for the band(s) where you're
hearing the most noise. If noise remained, I'd next tackle the video
cable and the printer cable. Use the graphs in Appendix One of
http://audiosystemsgroup.com/RFI-Ham.pdf as a guide to picking the cores
and winding the chokes.
Do your fellow hams another favor -- post the brand names and/or vendors
of both the noisy power supply and the one that fixed your problem (if
it does). :)
73, Jim K9YC
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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