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Re: [TenTec] RF Ground

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] RF Ground
From: Martin Ewing <martin.s.ewing@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 4 Apr 2009 19:28:38 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Sat, Apr 4, 2009 at 3:55 PM, Jim Brown <k9yc@audiosystemsgroup.com>wrote:

> Martin Ewing wrote:
> > Yes, but... It's still worth trying to establish a local RF "ground" --
> > ensuring that everything in your shack is bonded together.  No antenna
> > system is perfect, and many of us have some RF in our shacks.
>  Fortunately,
> > the same bonding is needed for lightning and AC safety reasons, although
> > inductance is not a worry at 60 Hz.
> >
> > The ideal is a Faraday Cage - enclosing your shack in a (nearly) solid
> > conducting box.
> >
> But a Faraday cage is NOT a solution to the fundamental problem -- RF
> CURRENT flowing where we don't want it. A Faraday cage addresses the E
> field (capacitive coupling) and poor shielding. The E-field is rarely an
> issue with ham gear.
> The E-field and poor shielding IS a common problem with consumer gear,
> but usually 10-20dB less problematic than pin 1 problems excited by RF
> current.  If you're going to build  a Faraday  cage, build it in your
> living room or office where your computers are, not your ham shack. :)
> 73,
> Jim Brown K9YC

If you're in a Faraday Cage, you are not sensitive to currents flowing on
the outside, which is where any unbalanced antenna currents should go -
assuming no "pin 1" issues.  It doesn't help the antenna system, but it
keeps you from getting RF burns.

A real FC is beyond most of us, so this is mainly a theoretical point.

73 Martin AA6E

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