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[TowerTalk] Top Band 4 Square

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Subject: [TowerTalk] Top Band 4 Square
From: "Adrian Rees (MW1LCR)" <>
Date: Sat, 22 Jul 2006 18:43:38 +0100
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Hi all

First of all, many thanks for the extremely helpful advice you have all
offered, both on and off list.

After giving this some thought, I am going down the route of de-tuning the
towers, and modelling the potential solution. At this point, the actual
towers havn't been installed, although I have permission to install them.
They MUST be in a square formation, but can be between 20 and 50 m apart.
Each tower will support various Yagi's....So.....

I am using MMANA to model a 4 Square on Topband, and need some help.

Although I have a working 4 Square file that MMANA can use, I am puzzled how
to model the effects of the metal supporting towers in MMANA.


Now then, I plan on running a catenary wire (well rope) from the top of each
tower to the next one. This will support a T aerial, fed against earth (or
elevated radials). The vertical part of the T will be 80 feet, the remaining
top part of the T will be about 40 Feet a side. This seems to work FB in
Freespace in MMANA.

What I need to do is to model the effects of the supporting towers. I am
particularly interested in the effects on the radiation pattern / angle.

The plan is to de-tune the towers with Gamma Rods with either Capacity or
Inductive loading.

Question is, how far do I de-tune them, given that an 80 M 4 Square is
planned as well.


Any help ?

Adrian Rees MW1LCR


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