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-boun...@contesting.com [mailto:topband-boun...@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 _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK