[TowerTalk] Stacking Tribanders

[David Gilbert]

Funny ... Ron privately answered me to thank me for the correction.

I never said that HFTA wasn't extremely valuable.  I used it when 
designing my station to determine the optimum heights for my antennas 
given my terrain profile ... at least within the physical limits of hwat 
I could afford.

What I said was that HFTA is of no use in determining optimum stacking 
separation, and I stand by that statement.

Dave   AB7E




On 6/21/2022 6:43 PM, Billy Cox wrote:
> Dave G. ... did you miss or ignore this line of Ron's reply?
>
> "One without the other is a waste of time."
>
> Ron is correct, neither program provides a complete answer,
> as both have known limitations. On the other hand, Ron is
> quite the fast learner, as demonstrated by the excellent
> station he has built, with scores that support his planning.
>
> 73 de Billy, AA4NU
>
>> On 06/21/2022 3:48 PM David Gilbert <ab7echo at gmail.com> wrote:
>>
>>   
>> 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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