It all depends on the terrain surrounding your station Bob. HFTA takes your
terrain profile and provides a "figure of merit" given your antenna gain and
height. You can move the antenna height until you find the optimum result
given these factors as well as the incoming/outgoing angles to the targeted
area. In this case it is the Carribean.
So, bottom line. Use the MicroDem and other tools to get your terrain
profile. That is the hard part. The rest is easy.
73,
Guy N7ZG
> From: k6uj@pacbell.net
> Date: Thu, 1 Mar 2012 16:45:43 -0800
> To: towertalk@contesting.com
> Subject: [TowerTalk] 15 meter yagi height for 6000 miles
>
>
> Has anyone used the HFTA program and can tell me the best height for a 15
> meter yagi for 6000 miles.
> Assuming there aren't any hills obscuring the take off angle.
>
> The carribean is about 6000 miles from my qth and from experimenting I have
> noticed that lowering the beam
> down from 90 feet down to 50 feet it is markedly better for 15 meters.
>
> I just bought the new antenna handbook and plan to dive in and learn how to
> do the HFTA myself but was
> hoping someone else had an idea of the best take off angle angle for 6000
> miles on 15.
> I believe 50 feet is about 3/4 wavelength high and gives me a 20 degree
> takeoff angle on 15.
> Hope this all makes sense, hihi.
>
> Bob
> K6UJ
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