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Re: [TowerTalk] Parallel Inverted L's for 40/75m??

To: "" <>
Subject: Re: [TowerTalk] Parallel Inverted L's for 40/75m??
From: "Jim Brown" <>
Date: Tue, 25 Dec 2007 13:12:43 -0800
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On Tue, 25 Dec 2007 15:44:25 -0500, Todd Coulter wrote:

>Is it ok to build parallel inverted L's for both 40m and 75m similar to
>the method that you would build parallel dipoles? 

I'm planning to do exactly that for 80 and 160. I think I can get the top 
up to about 90 ft, so the 160 will be a Tee, the 80M will be a straight 
quarter wave. The antenna will be made of wire and suspended between 
trees. I've done the NEC model, and it looks good. I use 1/2 inch PVC 
conduit cut into lengths of about 1 ft as spacers for my fan dipoles, and 
plan to do the same for this antenna. 

Another idea I'm toying with is to use multiple conductors for each band 
to increase the SWR bandwidth, again using spacers.  

One thing to watch out for is interaction with your tower, which is 
rather likely if the tower is close to a half wave (or multiple of half 
waves) on either band. 


Jim K9YC


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