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Re: [RFI] shielding question

To: RFI List <rfi@contesting.com>
Subject: Re: [RFI] shielding question
From: Jim Smith <jimsmith@shaw.ca>
Date: Tue, 23 Dec 2003 00:52:25 -0800
List-post: <mailto:rfi@contesting.com>
Hi Jim,

I found the site where the papers are but AES wants $10 each for them. Is it possible that you, being the author, can put them up on a web site and let the folks on this reflector know where to find them?

73 es Merry Xmas de Jim Smith VE7FO

Jim Brown wrote:

On Mon, 22 Dec 2003 14:59:31 -0800, Jim Smith wrote:

Could you explain the mechanism (or point me to a source) whereby the sheld is rendered useless by the presence of a drain wire at HF?

I can do both. It's called "shield-current-induced noise," (SCIN). It
was first described by Neil Muncy (ex-W3WJE) in an AES paper in 1994,
based on research he did only at audio frequencies. I've done more
research on it in the last year or so, publishing my research in two
AES papers -- one in March, 2003, presented in Amsterdam, and one in
October, 2003, presented in NYC. Neil's 1994 paper and my March paper
are available from the AES (www.aes.org). The October paper will be
there in a few months (for some reason, it takes a while after the
convention to get it there). My March paper extended Neil Muncy's work
to 4 MHz, the NY paper took it up to 300 MHz. Both of my papers include
lots of data on real cables, and show the effect of various cable types
on RF detection in equipment. They also document my test setup, and
report of field testing of cables and equipment when exposing it to ham
transmitters on Field Day, and to broadcast transmitters.

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