I found the supply by searching for "Laboratory and medical grade computer
power supplies" on the web.
I found several, and sent a few emails to the vendors just to make sure. I
finally settled on the one that had the lowest figures for noise and ripple.
Berry W6EZ
"Patrick A. Thompson Sr." wrote:
> Thank you for the report and congratulations!
>
> How did you know that this supply had adequate filtering before you bought
> it?
>
> My next step to cure computer RFI from my power supply would have been to
> purchase a name brand supply, perhaps PC Power and Cooling. The supply in
> my Athlon 1300 MHz was branded suitable for "office and home use" but
> internally had places on the PC board for filters but only empty space and
> wire jumpers. A PC Power and Cooling power supply would have cost (from
> memory) about $65. Their site lets you choose the environment the supply
> will be used in such as "home" or "industrial".
>
> What I did was to buy a Corcom filter off of Ebay ($5) and run a shielded
> pair from the power supply case to the filter and shielded pair back into
> the power supply AC input all inside the PC box.
>
> Noise is almost gone.
>
> I would like to avoid this problem with my next PC.
>
> Pat
> wa4tuk
>
> > -----Original Message-----
> > From: rfi-admin@contesting.com [mailto:rfi-admin@contesting.com]On
> > Behalf Of Berry Griffin
> > Sent: Thursday, December 19, 2002 7:41 PM
> > To: RFI@contesting.com
> > Subject: [RFI] computer rfi report
> >
> >
> > A few months ago, I posted here asking about a problem I was having with
> > noise on my hf radio coming from my computer.
> > I had narrowed it down to the power supply ( by disconnecting everything
> > from the computer case and turning on the power, only to have the noise
> > at the same level ) and I finally replaced the offending power supply.
> >
> > I replaced it with a ATXPOW450PRO from StarTech.com. It is a 450 watt
> > supply, with 8 hard Lp4 drive power taps, 3 floppy SP4 taps, a single
> > mother board connector, 1 x 4 pin extended ATX 12v for pentium 4, and 1
> > x ^6 pin auxiliary plug so it should run just about anything that run an
> > ATX supply. It weighs in at 4.6 lbs. pretty hefty!
> >
> > Now for the rfi ( or total lack of ) report. No news is good news in
> > this instance. I can see no difference with my computer on or off now.
> > Happy days! I am back on 75 meters with hf and internet at the same
> > time. Of course, the wife will not like me being back in the sack as
> > much as before, but hey, she is supposed to understand. ( She's a ham as
> > well. )
> >
> > Not often do I get to report complete success in my quest for reducing
> > noise on HF. I happy to say I am totally please with this power supply
> > and it may be worth a try for anyone having the same problem I had.
> >
> > 73 to all
> >
> > W6EZ
> >
> >
> >
> >
> > _______________________________________________
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> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >
>
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