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Re: [TowerTalk] HFTA data files

To: "Jim Brown" <>, "Tower Talk List" <>
Subject: Re: [TowerTalk] HFTA data files
From: "Vytenis Sciucka" <>
Date: Fri, 26 Jun 2009 20:16:58 +0300
List-post: <">>
Thank you Bill, Pete and Jim
I think I will spend this evening to midnight playing with HFTA :-) One 
important thing is I got more or less trustworthy arrival angles from the link 
Pete provided me. Luckily lithuanian landscape is quite flat so real terrain 
data would not be far from flat data. Finally I think GPS also could help me or 
my friends to find real data. 


----- Original Message ----- 
From: "Jim Brown" <>
To: "Tower Talk List" <>
Sent: Friday, June 26, 2009 7:56 PM
Subject: Re: [TowerTalk] HFTA data files

> On Fri, 26 Jun 2009 12:52:04 +0300, Vytenis Sciucka wrote:
> Hello Vytenis,
> You have gotten excellent advice from others, especially Pete and Bill, 
> but I will add this about the terrain data. I've used HFTA a lot, and so 
> have many hams who live near me. We find it to be a very good predictor of 
> the propagation of horizontal antennas. To use it, you must enter terrain 
> data for your location. In the US it is easy to get this data, because it 
> is published by our government on the internet. It is also possible to 
> obtain the data from paper topological maps (that is, maps that show 
> elevation of your terrain). To do that, you first find the map, then mark 
> your QTH and draw radials from your QTH to the directions you want to 
> study. Then mark points at regular intervals on each radial, note their 
> elevation, and enter each point into HFTA. I've done this for two radials 
> from my QTH, before I found the data on the internet. It takes more time, 
> but it works.
> N6BV is my neighbor, and a member of our Northern California Contest Club. 
> He often gives us advice on many things, including HFTA. I live on the 
> side of a mountain, so the radials go up and down a lot. He advised me to 
> carry the radials out to about 5 miles (8 km). If your terrain is flat, 
> you don't need to enter terrain data, but if it goes up and down, it is 
> VERY important that you enter it to get accurate answers.
> 73,
> Jim Brown K9YC
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