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Re: [TowerTalk] THHN

To: "TopBand List" <topband@contesting.com>,"Tower Talk List" <towertalk@contesting.com>
Subject: Re: [TowerTalk] THHN
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 22 Oct 2007 22:27:01 -0700
List-post: <mailto:towertalk@contesting.com>
On Mon, 22 Oct 2007 19:06:40 -0400 (EDT), n8cc@mei.net wrote:

>Faced with this question several years ago, I made a 15 meter dipole
>out of #14 solid copper 600V THHN wire.  I strung it up between a
>tree and  a wooden pole, about 20 feet off the ground.  I checked
>the resonant frequency.  I then lowered the antenna, stripped  the
>insulation off the wire, and repeated the exercise.  The difference
>in resonant frequency was almost exactly 3 percent.  Since then,
>I've observed that THHN wire always makes a difference of between
>2-3 percent from formula, depending on wire size,manufacturer, and
>whether solid or stranded.

>Not the most scientific approach, 

I'd call that VERY scientific -- you set up a controlled experiment and 
carefully measured it! The only way to improve your science would be to 
measure a lot of antennas and a lot of wire types and wire sizes. But 
what you've done was right on, and quite helpful! Thanks. 

73,

Jim K9YC



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