In a message dated 1/21/2010 3:50:05 PM Greenwich Standard Time,
jim@audiosystemsgroup.com writes:
HFTA can handle any distance that you choose to enter. The limitation is
the
number of data points for each radial. So there would be no problem
including
that mountain in your analysis.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
One additional piece of info. The further away the terrain the less of an
effect it will have. N6BV was kind enough to run some numbers for me and
the numbers for the terrain were computed up to around 14000 ft. He told
me there was no reason to go to any further than that.
If the land surrounding your location is just slightly hilly without big
dips and so forth you can probably get by with a number for every 100 feet
running out to maybe 5000 ft. That would make it easier to input the
numbers if you are using Google Earth. If you saw a big difference from the
"flat terrain" I would continue to run the numbers out further.
I'm a firm believer in the program, but one caveat......The program starts
to break down when you start putting like antennas too close to each other
in stacks. The gain figures become inflated. As long as you keep the
antennas at least 1/2 wavelength apart, the numbers should be good.
Bill KH7XS
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