[TowerTalk] 80 mts four square or yagi?

[W0MU Mike Fatchett]

What values did you get using HFTA.  HFTA has some issues with very 
close spaced stacks.  The numbers are wrong.

Mike W0MU

On 3/9/2015 7:09 PM, Jorge Diez - CX6VM wrote:
> Thanks Jim
>
> Sorry for the delay, just returning from along trip after ARRLDX SSB
>
> Is curious HFTA. It stopped my project for a two stack for 20 mts yagís.
> Since many contesters told me to put it at 69/139 ft, HFTA told me that this
> is not the best distances.
>
> OK about your document, will read it, but here we don´t have such facilities
> than in USA to know ho´w the ground conductivity, the terrain data, etc, etc
>
> 73,
> Jorge
>
>
> -----Mensaje original-----
> De: TowerTalk [mailto:towertalk-bounces at contesting.com] En nombre de Jim
> Brown
> Enviado el: domingo, 08 de marzo de 2015 02:44 p.m.
> Para: towertalk at contesting.com
> Asunto: Re: [TowerTalk] 80 mts four square or yagi?
>
> On Sun,3/8/2015 10:06 AM, Jorge Diez CX6VM wrote:
>> Wish someone have some analysis or field test to compare a 4SQ with
>> sixty 1/4 WL radials each vertical and a 3 element wire yagi with boom
>> at 115ft
> This is not exactly the answer, but it should help you think about it.
> http://k9yc.com/VertOrHorizontal-Slides.pdf
>
> Also, if the land around you is not flat, you also need to study and use
> HFTA extensively. It comes on the CD with the ARRL Antenna Book. HFTA tells
> only about horizontally polarized antennas, NOT verticals, because they
> interact with the earth very differently. The slides tell a big part of that
> story.
>
> 73, Jim K9YC
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