[CQ-Contest] Contest QTH

David Gilbert xdavid at cis-broadband.com
Sat May 22 21:47:39 PDT 2010

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.

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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