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Re: [RFI] Recommended PC Components for Low EMI/RFI?

To: rfi@contesting.com
Subject: Re: [RFI] Recommended PC Components for Low EMI/RFI?
From: Phil Duff <na4m@arrl.net>
Date: Sun, 28 Dec 2003 05:50:23 +0000
List-post: <mailto:rfi@contesting.com>
At 04:10 12/28/2003, Colburn wrote:
I am about to assemble a new PC.  I would like to select
components that have better than average resistance to
external RF and minimal output of same.

I'd like to start with the motherboard.  While I am fond
of the features of the EPoX 8KRA2+ (I am told that it is
just now out of production and replaced by the 8KRAI so
dealers still have them). I cannot find any data re.
EMI/RFI specs. (Indeed there is little if any comparative
data between mobos anywhere.)

Then I need to select a case and power supply:  ATX,
400 watts or better, front panel USB access ... but
aluminum or steel?  I don't care about looks, certainly
not about clear side panels or colorful lights ... just
stability and low EMI/RFI.

I went thru this same exercise about 2 years ago.

My approach was to select the case and power-supply first as it's the computers first line of "defense" in EMI/RFI suppression.

I chose an Antec steel mid-tower case and power-supply. The Antec cases are well designed and the power-supplies seem quiet.

I've had two different mobo's in this Antec case both running an AMD Athlon Thunderbird cpu at 1.2ghz - the first was a ASUS mobo with which I was disappointed when one of it's EIDE channels died and corrupted a harddisk after a few months. I replaced the ASUS with a FIC mobo and have been very pleased.

As a point of reference - this 1.2ghz system has far and away much less EMI than my old generic case and p.s. that ran a Cyrix P166+ cpu. I have no noticeable EMI or digital noise in my receivers that I can blame on the computer. And have never had the system crash due to RF getting into the system at power levels up to 1.5kw. The computer is in the radio shack BTW.

73 Phil NA4M

_. ._ ...._ __ _. ._ ...._ __ _. ._ ...._ __ _. ._ ...._ __ Phil Duff NA4M Ann Duff Georgetown, Texas

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