[TowerTalk] HTFA and Reality

[K4SAV]

HFTA gives incorrect gain for yagis stacked that close.  The manual has 
a warning about yagis spaced closer than 1/2 wavelength.

Jerry, K4SAV

Kjeld Holm wrote:

>Gentlemen:
>
>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.
>
>Vy 73
>OZ1CCM Kjeld
>
>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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