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Re: [TowerTalk] Station Ground

To: "Tower Talk List" <>
Subject: Re: [TowerTalk] Station Ground
From: "Jim Brown" <>
Reply-to: Jim Brown <>
Date: Fri, 14 Jan 2005 16:55:48 -0600
List-post: <>
On Fri, 14 Jan 2005 14:37:52 -0800 (PST), N6KJ wrote:

>Why do you need "beefy" connections from bus-bar
>to ground when you use much smaller wire
>connecting the equipment to the bus-bar?

It's all part of fooling ourselves about the basic physics. The 
impedance of a conductor at RF is FAR more dependent on its 
INDUCTANCE than upon its resistance.  So the only value of that 
"beefy" wire is that it might take a microsecond longer to melt in 
the case of a direct lightning hit. The smart money is on wide 
copper strap, not braid, for lower inductance and longer life. 

There's a discussion of some of this in a power and grounding white 
paper on my business's website.  

Jim Brown  K9YC


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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