[TowerTalk] Stacking Tribanders

[David Gilbert]

That's just plain wrong.  That's using HFTA to determine optimum height 
above ground ... not optimum stacking distance (i.e., separation).  They 
are NOT the same thing.  HFTA does NOT properly calculate anything based 
upon stacking separation.

Dave   AB7E



On 6/21/2022 11:23 AM, Ron WV4P wrote:
> HFTA should Always be used to try to optimize stacking distance.
>  It shows the nulls and enhancements created by Your Terrain, and how 
> to exploit and or cover them. Then you can use another program, like 
> EZNEC to calculate the stacking gain as a function of stacking 
> distance based on the HFTA data.
>
> One without the other is a waste of time.
>
> HFTA tells you where to put the antennas.
> EZNEC tells you what antennas to put there.
>
> Ron, WV4P
>
> On Tue, Jun 21, 2022 at 1:00 PM David Gilbert <ab7echo at gmail.com> wrote:
>
>
>     HFTA should never be used to try to optimize stacking distance.  It
>     simply does not actually calculate the stacking gain as a function of
>     stacking distance like EZNEC would.
>
>     73,
>     Dave   AB7E
>
>
>
>     On 6/21/2022 10:34 AM, sawyered at earthlink.net wrote:
>     > HFTA kinda sorta calculates stacking properly.  It seems to
>     assume you get
>     > the optimum 2.7db stacking gain whether the spacing is optimum
>     or not.  And
>     > it draws the HFTA ray from the center point between the 2.  So
>     it would
>     > calculate a 2 high stack of 20M yagis having an added 2.7db of
>     gain even if
>     > they are stacked only 20 ft apart and will draw the enhanced ray
>     from the
>     > midpoint between the 2 yagis.
>     >
>     >
>     >
>     > Ed
>     >
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