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Re: [TowerTalk] OT: Exterior Ethernet Cable

To: "tower >> \"towertalk@contesting.com\"" <towertalk@contesting.com>
Subject: Re: [TowerTalk] OT: Exterior Ethernet Cable
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 11 Aug 2008 07:52:11 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon, 11 Aug 2008 07:01:46 -0500, Matt Patterson wrote:

>They also make shielded RJ-45 connectors if you are thinking of going 
>with the shielded outdoor gel filled CAT5E.

I wouldn't throw money at shielded cable of any CAT-number. The primary 
interference rejecting property of that cable is the very high and very 
uniform twist ratio, and the primary RFI mechanism at HF is common mode 
current. Shielding won't help that much. Common mode chokes will. See 
http://audiosystemsgroup.com/RFI-Ham.pdf

73,

Jim Brown K9YC


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