Dear Pete (and others)
Thanks for your quick and informative answers.
I think I must go for a single Force 12 C3SS as high as possible. I cannot
go for a bigger antenna as the perimeter of the rotating antenna (turning
radius) will go too near my neighbours at a hight 26 feet. Going from C3SS
to a longer boom (C31XR) will raise turning radius from 13.6, to 23.8 feet
lowering allowable height to 13 feet. Modelling the bigger antenna at 13
feet shows inferior performance.
From: Pete Smith [mailto:firstname.lastname@example.org]
Sent: 23. januar 2007 13:21
To: Kjeld Holm
Subject: Re: [TowerTalk] HTFA and Reality
Kjeld - you are right to be skeptical - HFTA uses a point-source modeling
technique for each individual antenna, which causes unrealistic results at
very close spacings. Intuitively, given your QTH, I believe that a
longer-boom tribander at the highest available point will perform best.
73, Pete N4ZR
At 05:02 AM 1/23/2007, you wrote:
>I am using HFTA in planning for an array for 10 to 20 m. Due to zone
>restrictions I am modelling a lot of solutions - normal and crazy ones
>among each other. As I may end up being restricted to a top point of 26
>feet I modelled a 4 stack of 2 elements yagis at 17/20/23/26 feet.
>According to HTFA this should work fine on all three bands (less
>performance on 20 m of course). But I do not believe in such a close
>spacing in the real world. Any comments would be appreciated.
>PS I am located on a 190 feet hill top with rather steep sides.
>Some months ago I had a question about a low yagi for 40 m and I would
>like to thank every body who told me that the only way to find out
>anything was to use HFTA.
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