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Re: [TenTec] Faraday cage

To: <ken.d.brown@hawaiiantel.net>, "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Faraday cage
From: "Gary Hoffman" <ghoffman@spacetech.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 4 Apr 2009 18:16:20 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
That's right Ken.  And don't forget to mention that you would also have to 
avoid ground loops inside the cage.

We had a faraday cage at work (Kodak) where we did RF emissions and 
susceptibility testing.  The cage was build to the max.  You have no idea 
the money spent.  SOLID copper walls, etc.

Still had noise like hell inside.

73 de Gary, AA2IZ

----- Original Message ----- 
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, April 04, 2009 4:20 PM
Subject: [TenTec] Faraday cage

>>> The ideal is a Faraday Cage - enclosing your shack in a (nearly) solid
>>> conducting box.
> The only way a Faraday cage around your shack could save your radio
> equipment from the effects of RF would be if every single cable had
> perfectly balanced RF currents so that no cable inside the shack Faraday
> cage radiated any RF, and every piece of equipment (except perhaps the
> one you are trying to protect from RF by shielding and bypassing
> everything else instead of this one piece of equipment) would have to
> have proper shielding and RF bypassing of all leads that entered/exited
> each piece of equipment. If you could not accomplish all of that, the
> Faraday cage would do nothing for you. The Faraday cage could even have
> the effect of increasing the RF problems by virtue of standing wave
> resonances making hot spots in some places at some frequencies. Much
> less effort and expense to properly shield and bypass the piece of
> equipment that has the problem.
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