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Re: [TowerTalk] Looking for a Short Rotatable Dipole or...

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Looking for a Short Rotatable Dipole or...
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 28 Apr 2016 10:09:44 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Wed,4/27/2016 11:31 AM, Eric Rosenberg wrote:
I''m looking for a 40m rotatable dipole (preferably a F12 EF-140S) to add to 
the C3-SS on my roof.

Eric,

How about a vertical on your roof with radials? Both could be wire. The vertical wire could be mounted to a fiberglass mast like this. http://www.qsl.net/dk9sq/ Or do telescoping Al tubing and guy it at the top.

The radials don't need to be perfectly at right angles, and you don't necessarily need four -- three would work pretty well. Mounting it on the roof greatly reduces ground losses and improves the vertical radiation pattern. See my modeling study of this that ran in NCJ last year.

http://k9yc.com/AntennaPlanning.pdf

73, Jim K9YC
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