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@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@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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> >
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