Dave,
According to Dean, HFTA has a terrain pre-smoothing algorithm internally which
is applied to the raw elevation profile provided by the user. Unfortunately,
HFTA does not give you the opportunity to plot what this smoothing filter has
done to your elevation profile. Probably in a great majority of situations, the
pre-smoothing algorithm doesn't make the results overly sensitive to the
specific elevation profile. But in my case with the terrain bounding up and
down like a washboard, what the smoothing algorithm is doing "may" make a big
difference.
Ian suggests getting by the 149 point limit by manually editing out large
shadow areas, etc. Good idea if you can be sure they are indeed shadow areas
and refracted signals are not getting into them. Personally, I'd be at a loss
to come up with rules for such manual editing of elevation profiles except in
simple situations like a nearby large body of water with mountainous terrain on
the other side.
Shawn
N3AE
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