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Re: [TowerTalk] 15 meter yagi height for 6000 miles

To: k6uj@pacbell.net, towertalk@contesting.com
Subject: Re: [TowerTalk] 15 meter yagi height for 6000 miles
From: dotravel@aol.com
Date: Fri, 2 Mar 2012 01:50:43 -0500 (EST)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Unless you are on totally flat ground for miles around you'll need to run the 
Microdem program to import your exact location into HFTA to actually get the 
correct gain and take off/landing angle info along with the predicted historic 
DX angles that work.

Without knowing how your local terrain affects the theroetical antenna height 
you won't have much to go by!  

I can send you some examples of my QTH if you'd like -- tribander at 50' with a 
225' drop-off to the East. . 

John NA6L 


-----Original Message-----
From: Bob K6UJ <k6uj@pacbell.net>
To: Towertalk <towertalk@contesting.com>
Sent: Thu, Mar 1, 2012 4:46 pm
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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