[TenTec] RF Ground

[Bob McGraw - K4TAX]

Very good suggestions.

73
Bob, K4TAX


----- Original Message ----- 
From: "Jim Brown" <k9yc at audiosystemsgroup.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, April 06, 2009 8:08 PM
Subject: Re: [TenTec] RF Ground


> Re: the tower 350 ft from the house. I would bond the ground rods at the 
> tower to the service entrance ground. I would bond the coax to the 
> ground rods at the base of the tower, put a big ferrite choke on the 
> coax at the base of the tower (between the shack and the ground point), 
> and another before it comes into the shack. I would also have a bond 
> between the shack and the service entrance. . I would also have 
> Polyphasers on each coax at the shack to protect the front ends of the 
> radios.
> 
> What this does is start with everything at the same DC potential, and 
> keep it there when voltage gradually builds in a storm. In the case of a 
> strike, the ground electrodes are all tied together, but with 
> considerable inductance between the tower and the house. The chokes 
> minimize the voltage and current that goes to the shack for strikes of 
> moderate size. In the case of a strike, the inductance will cause some 
> gradient between the tower and the house, but the current that equalizes 
> that gradient is far less likely to go through your ham shack
> 
> And, your installation meets NEC, which could be an issue if you have 
> real damage.
> 
> 
> 73,
> 
> Jim Brown
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