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Re: [TowerTalk] Making an 80 meter vertical from Rohn 25

Subject: Re: [TowerTalk] Making an 80 meter vertical from Rohn 25
From: bob finger <>
Date: Wed, 23 Dec 2009 06:10:21 -0500
List-post: <">>
Get hold of a copy of ON4UN's Low Band book.  It is available from 
ARRL.  Johns book is considered the bible for low band antennas.  That 
book will tell you that a 12 inch tower will be resonant on 3500 if it 
is about 64 feet long, and a tower about 78 feet long feeds easily with 
some series capacitance in the feedpoint. A vacuum variable of about 
1000pf should allow you to easily tune to any point on the 75/80 band. 
   All assumes 5 ohms of loss in the radial system. 73 and Merry 
Christmas bob de w9ge

>I'm wanting to put up a full sized 80 meter vertical made from Rohn 25 in  
>my pasture. 
>Marty Haley AB5GU  

Bob Finger
8511 Swann Haven Road
Easton MD  21601
cell 703 408-2176
e-mail to: Finger@GOEASTON.NET


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