[TowerTalk] 15 meter yagi height for 6000 miles

[Bob K6UJ]

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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