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Re: [TenTec] What about antenna wire? What to buy?

To: tentec@contesting.com
Subject: Re: [TenTec] What about antenna wire? What to buy?
From: Stuart Rohre <rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 13 Jan 2011 14:53:37 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Amen to the advice of N6KB, to build your own antenna if you have not 
done one.

You should always cut the antenna elements longer than the dipole 
formula by the amount needed to go around your insulators. Don't forget 
there are two loops to be added, one for the center and one for the end 
insulator for each 1/4 wave element.  Now, add say 6 inches more to give 
you some adjustable length.  When you put your dipole up in the air to 
test its resonance, if it is too low in frequency, fold back the six 
inch extra and wrap its free end upon the standing part of the element 
back toward the middle of the wires.  If an antenna hits too high in 
frequency, you shorten it.  You can estimate how much to lengthen or 
shorten, by comparing the frequency you used in the formula to the 
frequency of resonance measured upon the first trial raising of the 
antenna. Or, if you are in hurry, just put up the dipole and use a tuner 
to correct for any mis-match to your feeder.

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