[Top] [All Lists]

Re: [TowerTalk] HFTA data files

To: "Tower Talk List" <>
Subject: Re: [TowerTalk] HFTA data files
From: "Jim Brown" <>
Date: Fri, 26 Jun 2009 09:56:14 -0700
List-post: <">>
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.


Jim Brown K9YC


TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>