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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