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Re: [TenTec] RF Ground

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] RF Ground
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 04 Apr 2009 21:13:39 +0100
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Have you ever considered that providing a better local RF "ground" could 
make "RF in the shack" problems worse?

Take the example of a half-wave dipole fed with coax that is a multiple 
of a half-wavelength long and bonded to a "good RF ground" at the shack 
end. If there is no choke balun at the feedpoint, significant 
common-mode current will flow down the outside of the coax braid because 
it represents a low impedance path to earth. The better you make that 
"RF ground", the higher the common-mode current and the greater the 
potential for RF in the shack.

Steve G3TXQ

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.  

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