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Re: [RFI] Motherboard RFI

To: rfi@contesting.com
Subject: Re: [RFI] Motherboard RFI
From: Tree <tree@kkn.net>
Date: Sat, 2 Jan 2010 10:26:59 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Sat, Jan 02, 2010 at 10:13:41AM -0800, Dan Violette wrote:

> Maybe you have bad caps on the MoBo.  Was a problem in 5-10 year old MoBos.
> See:  http://en.wikipedia.org/wiki/Capacitor_plague  for some info with
> references.  Suppose bad caps could be allowing unintended radiation.  /Dan

Um - unlikely this is the root cause.

Those are bulk capacitors - who main job is to provide stable voltage levels
to the silicon components during dynamic changes in the current.

The caps that would affect EMI would be small - likely ceramic caps - near the

Is it possible that by pressing on the caps - a better connection is being made
to the chassis?  

Also - it wasn't explained how close the antenna is to the computer.  If it is
within 50 feet or so - this kind of interference might not be easy to totally

Tree N6TR (who designs motherboards for some company or other)
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