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Re: [RFI] shielding question

To: "Tom Rauch" <w8ji@contesting.com>,"Jim Smith" <jimsmith@shaw.ca>, "RFI List" <rfi@contesting.com>,<jimbrown.enteract@rcn.com>
Subject: Re: [RFI] shielding question
From: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 23 Dec 2003 08:30:04 -0800
List-post: <mailto:rfi@contesting.com>
Interesting discussion. During the experiments how was
the connection to chassis made at the source end ? Was it
through the drain wire or was the foil somehow terminated
to the source chassis? And how good is the connection
between the between foil shield and the drain wire in the
cables measured?

73 de Mike, W4EF...............................

----- Original Message -----
From: "Tom Rauch" <w8ji@contesting.com>
To: "Jim Smith" <jimsmith@shaw.ca>; "RFI List" <rfi@contesting.com>
Sent: Tuesday, December 23, 2003 2:39 AM
Subject: Re: [RFI] shielding question

> > 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?
> Jim and Jim,
> I was interested in why or how adding a drain inside a shield would
> render the shield "useless". I'd like to know what electrical effect is
> severe enough to cause common mode impedance inside the cable to be
> significantly less than common mode impedance outside the cable.
> The idea that a drain would upset everything for common mode excitation
> make rules invalid disagrees with my measurements of shields and shielded
> cables.
> Now I'm not saying a small change might not occur from cable to cable.
> I'm saying is I have a hard time understanding how a drain wire would
> a real-world system to the point where the shield "might as well not be
> there".
> Everything else makes sense to me.
> I draw the line at paying. I make it a point to NOT pay for references in
> hobby where people are here to help people, no matter who gets the profit.
> 73 Tom

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