[TowerTalk] 15 meter yagi height for 6000 miles

[Bob K6UJ]

yeah I was waaaaay off,  hihi

Bob
K6UJ




On Mar 1, 2012, at 7:03 PM, n8de at thepoint.net wrote:

> 6000 miles from CA to the Caribbean?   Not on this planet!  6000 miles from your QTH in CA reaches to the Eastern tip of Brazil and a tad beyond.
> 
> Try again with your distance measure.
> 
> I agree with Guy's tome.
> 
> 73
> Don
> N8DE
> 
> 
> 
> Quoting Guy Molinari <guy_molinari at hotmail.com>:
> 
>> 
>> 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 at pacbell.net
>>> Date: Thu, 1 Mar 2012 16:45:43 -0800
>>> To: towertalk at 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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> 
>