[Top] [All Lists]

Re: [TowerTalk] THHN

To: "TopBand List" <>,"Tower Talk List" <>
Subject: Re: [TowerTalk] THHN
From: "Jim Brown" <>
Date: Mon, 22 Oct 2007 22:27:01 -0700
List-post: <>
On Mon, 22 Oct 2007 19:06:40 -0400 (EDT), 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. 


Jim K9YC


TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>