[UK-CONTEST] Antenna Modelling ~ Top Band 4 Square

[Adrian Rees (MW1LCR)]

Hi
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.

Background:

At the moment I plan on installing 4 Towers, each a Quarter wave apart on
Topband (40m)
Each tower will have a Yagi array (various bands) mounted on it. The maximum
height is 80 Feet.

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.

Thanks


Any help ?
Thanks

Adrian Rees MW1LCR