[CQ-Contest] Contest QTH

Hank Lonberg kr7x1 at verizon.net
Sun May 23 09:03:20 PDT 2010

Actually there is a limit. I believe it is 113 +- discrete
data points.

Hank / KR7X

-----Original Message-----
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of David
Sent: Saturday, May 22, 2010 9:48 PM
To: cq-contest at contesting.com
Subject: Re: [CQ-Contest] Contest QTH

Hi, Pete.

I don't think there is any kind of formal limit in HFTA.  The
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
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
terrain, but I don't think the program constrains itself to
particular distance.

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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