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Re: [TowerTalk] 4 square question

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 4 square question
From: jimlux <jimlux@earthlink.net>
Date: Fri, 23 Oct 2020 05:42:27 -0700
List-post: <mailto:towertalk@contesting.com>
On 10/22/20 7:39 PM, kq2m@kq2m.com wrote:
I really want to thank Jim, Jeff, Les, Mike, John and Gary for all of their 
help, answers and ideas to which I have been giving a lot of thought this week. 
The information gleaned has made me confident of the new design.  Unfortunately 
there is no way to avoid putting the 4-square elements around the tower so I 
know that interaction effects will likely be noticed.  Vicious storms have 
taken down all the other tall trees that were previously in use to support my 
80 meter 4-square.

Note to Jim Lux – I am particularly intrigued by your idea of changing the 
feeding of the elements so that I can radiate broadside from the side of the array 
rather than on the diagonal since the only trees that I have to support elements 
happen to be roughly N, E, S and West, which, with the Comtek phasing box, would give 
me radiation N, E, S and West rather than the desired NE, SE, SW and NW.

If you feed N and E the same, and S and W the same, but 90 degrees advanced, then you'll form a beam to the NE (it's basically two parallel 2 element arrays)

The gain's not as good as the "shoot across the diagonal" (which is like a 3 element "binomial" array, fed 1:2:1), but it will have a null to the SW.


The Comtek ACB-4 outdoor box uses the NW element in Pos 1 on the outdoor , NE 
(2), SE (3) and SW in position 4 and arranged as shown in the .pdf:

www.static.dxengineering.com/pdf/comtek_4_square_info.pdf

Which elements (N, E, S, W) would you put in which positions on the box (so 
that the 4-square radiates toward the NE instead of East?






How is the gain and F/B and F/S compared to the standard pattern that radiates 
diagonally?


Tnx to all & 73!

Bob KQ2M



-----Original Message-----
From: Gary Johnson
Sent: Monday, October 19, 2020 12:49 PM
To: kq2m@kq2m.com
Cc: towertalk-request@contesting.com
Subject: Re: [TowerTalk] 4 square question

This article may be of some use to you in your 4-square adventures. It
also appeared in NCJ.

http://wb9jps.com/Gary_Johnson/Amateur_Radio_files/Four_Square_Rebuild_at_N6RO.pdf

-Gary NA6O

On 10/19/2020 9:00 AM, towertalk-request@contesting.com wrote:
From: TowerTalk<towertalk-bounces@contesting.com>  On Behalf Ofkq2m@kq2m.com
Sent: Sunday, October 18, 2020 1:49 PM
To:towertalk@contesting.com
Subject: [TowerTalk] 4 square question

Hi,

I will be rebuilding several 4-squares this season as well as restringing them 
in different trees due to Tornado damage (loss or destruction of many trees at 
my qth) during Tropical Storm Isaias on August 4th.  I have a few questions for 
which I would appreciate your guidance....
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