Yes but to Shawn's point there is an arbitrary limit to the number of points
allowed. I had a friend in CO ask me to do a plot for him using MicroDEM
and the 10 meter points (1/3 arcsec) ... he had distant mountains that
didn't show in the normal 14,000' range ... but when I tried to go out
further, using this with HFTA it told me there was a limit to 149 points. I
had never seen that before in my use - using 10 meter and 5 deg
increments... but to Shawn's point in a reply today, something I hadn't
thought about with my runs, 4400M (14K' roughly) would be 440 points if it
was 10 meters and 147 if 30 meters... so it might very well be that it
truncated the data using only every third one and all this time I had been
believing I was using 10 meter points!
My plots look quite undulated and match a topo map ... but I can now easily
see that it could very well be 30 meters since the major demarcation points
are 1000'!
This would be the first thing I'd like to see changed - take it, change it
so that it can use the 10 meter data out to the full extent.
Gary
-----Original Message-----
From: Jim Brown
Sent: Saturday, July 16, 2016 7:28 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] HFTA Disc....
Gary,
When I was running HFTA on my QTH in the Santa Cruz mountains, Dean
advised me to to out to 10-15 miles. This ignores small variations, like
the gullies being described. The radial data is a plain text file, and
it is possible to generate your own data from topo maps. When I started
using HFTA, I did a few radials this way as an exercise.
73, Jim K9YC
On Sat,7/16/2016 3:03 PM, StellarCAT wrote:
I use the 10M range data with HFTA exclusively! The 30 is far too long of
a sample point. I'd prefer even smaller if available. I set up microdem at
5° increments and never have a problem getting the full data set. Works
great.
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