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Re: [TowerTalk] Window line and Balun

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Window line and Balun
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 26 Jan 2009 10:13:34 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon, 26 Jan 2009 10:57:33 -0500, Tim Holmes wrote:

>the shack was instantly flooded with RF,

The fundamental cause of your "RF in the shack" is common mode 
current on the feedline. The cure for that is a good common mode 
choke. Unfortunately, it isn't practical to choke ladder line, you 
must wind the choke using coax on one or more ferrite cores. 

To understand this, study http://audiosystemsgroup.com/RFI-Ham.pdf  
and the Power Point presentation about Coaxial Chokes on 

http://audiosystemsgroup.com/publish 

73,

Jim Brown K9YC



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