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[TowerTalk] HFTA Disc....

To: xdavid@cis-broadband.com
Subject: [TowerTalk] HFTA Disc....
From: N3AE <n3ae@comcast.net>
Date: Sun, 17 Jul 2016 18:28:46 +0000 (UTC)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Dave, 

According to Dean, HFTA has a terrain pre-smoothing algorithm internally which 
is applied to the raw elevation profile provided by the user. Unfortunately, 
HFTA does not give you the opportunity to plot what this smoothing filter has 
done to your elevation profile. Probably in a great majority of situations, the 
pre-smoothing algorithm doesn't make the results overly sensitive to the 
specific elevation profile. But in my case with the terrain bounding up and 
down like a washboard, what the smoothing algorithm is doing "may" make a big 
difference. 

Ian suggests getting by the 149 point limit by manually editing out large 
shadow areas, etc. Good idea if you can be sure they are indeed shadow areas 
and refracted signals are not getting into them. Personally, I'd be at a loss 
to come up with rules for such manual editing of elevation profiles except in 
simple situations like a nearby large body of water with mountainous terrain on 
the other side. 

Shawn 
N3AE 
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