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[TowerTalk] 40m quad

To: <>
Subject: [TowerTalk] 40m quad
Date: Thu, 4 Mar 1999 01:27:04 -0600
Interesting questions John.

First, let me say that I built a 2L 40M  Delta  Loop suspended from 
a 20 ft boom attached to the side of a tower at the 120 ft level.  The 
horizontal (bottom) side of the loops were at  80 ft.  I used 1/8 inch 
nylon ropes to pull out the bottomcorners.  To simplify installation 
and service, I placed pulleys at each end of the boom and ran a 
continuous loop of 1/4 inch rope.  This allowed me to attach the 
loops at the tower and pull them out to the ends.

The antenna was a KILLER to Europe, Africa, the Middle East, and 
Indian Ocean, aimed at 60 degrees.  I lost it, and every wire antenna 
on the place, after 8 years of excellent service when a small tornado 
or downburst knocked over dozens of trees in my yard and woods, 
falling on every antenna tie rope.

I now use a 2L Cushcraft 40M beam, tuned to the CW dimensions, 
on a different tower at 95 ft.   I am quite pleased with this antenna 
on CW but it is clearly not as competetive on SSB as the Delta Loop was.

The 8 ft wide tower you describe may have more of an effect than my 
15 inch wide tower.  It may be beneficial in your case to put the boom 
on a mast 10 to 20 ft above the tower.  

It is always nice to be able to rotate your 40M beam so you may want to
think about a "shorty-forty".  The heavy duty Cuchcraft looks like a good

You can make the 2L Delta loop reversible by feeding each loop
with 3/8 WL of coax and switching BOTH sides of the feedline.  
The unterminated feedline will look like an inductor at the feedpoint,
causing the non-fed element to look like a reflector.

GO   FOR   IT !   

Let us know how it plays.

73 / GL,   Tom   N4KG

On Sun, 14 Feb 1999 19:55:08 -0600 "John T. Duncan" <>

>I have access to a 90 foot tower and want to hang a fixed 2 el quad 
>for =
>40m.  The thought was to put a 20 to 24ft boom across top and using =
>ropes fashion a quad.  The problem is that the tower is 8 ft across 
>and =
>I would like thoughts on whether the quad would "see" all that metal!  
>Am I wasting my time?  Any help would be appreciated.

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