[TowerTalk] 15 meter yagi height for 6000 miles

[Cqtestk4xs at aol.com]

We contesters in FL, when opting for a second fixed antenna on the  Carib, 
usually opt for a tribander at about 45 feet or so.
 
Bill K4XS
 
 
In a message dated 3/2/2012 6:06:18 A.M. Greenwich Standard Time,  
xdavid at cis-broadband.com writes:



It's entirely possible that instead of optimizing your lobe  you were 
moving a notch.

Dave   AB7E



On  3/1/2012 8:27 PM, Bob K6UJ wrote:
> Jim,
>
> I'll look and  see if I can find some examples.  I plan to dive into HFTA 
but I was  hoping to have
> a better idea on this for the SSB contest that begins  tomorrow.
> One thing I know for sure is that lowering the beam down to  50 feet made 
a real improvement.
> I'm anxious to do the HFTA analysis,  should have a few 
surprises................
>
>  tnx,
>
> Bob
> K6UJ
>
>
>
>
>  On Mar 1, 2012, at 5:54 PM, Jim Lux wrote:
>
>> On 3/1/12 4:45  PM, Bob K6UJ wrote:
>>> 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.
>>>
>> There's some  example charts in the Antenna Book that might work for  
you.
>>   Pick another path that's of comparable length and  see what it says.
>> Europe is about 6000 miles from 6-land, isn't  it?
>>
>> What you need to look at is the arrival angle  statistics, and there's
>> charts for that.
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