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@contesting.com] En nombre de Jim
Brown
Enviado el: domingo, 08 de marzo de 2015 02:44 p.m.
Para: towertalk@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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