Actually there is a limit. I believe it is 113 +- discrete
data points.
Hank / KR7X
-----Original Message-----
From: cq-contest-bounces@contesting.com
[mailto:cq-contest-bounces@contesting.com] On Behalf Of David
Gilbert
Sent: Saturday, May 22, 2010 9:48 PM
To: cq-contest@contesting.com
Subject: Re: [CQ-Contest] Contest QTH
Hi, Pete.
I don't think there is any kind of formal limit in HFTA. The
terrain
slopes rapidly down eastward from my QTH at roughly 15% for
about a half
mile, maybe 8-10% after that for a couple of miles, and then
about 4%
for the next five miles. After that it starts sloping gently
upward for
a few miles before hitting a mountain ridge line about 15
miles away
that is just a bit higher than my QTH. I've compared terrain
files with
and without that distant ridge line and the impact is
definitely
noticeable at low angles. Granted, HFTA says my particular
QTH puts out
a lot of energy at very low angles (the major peak is at 2
degrees), so
maybe 4,000 meters is a practical maximum horizon for a more
typical
terrain, but I don't think the program constrains itself to
any
particular distance.
73,
Dave AB7E
On 5/22/2010 2:44 AM, Pete Smith wrote:
> HFTA only uses terrain out to about 4000 meters.
>
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