[amsat-bb] Over the horizon

[Al Zoller <n7ub@xxxxxxxxxxx>]

Hello any propagation experts:

I am copying good telem when NOVA says I am past LOS and AO-40 is
at El -8 deg. QTH is at 6000' on the side of a mountain with average
terrain  1000' below. This seems to happen when LOS is to WSW, ~240deg Az.
In that direction my horizon is a mountain range 10,000' high and 50 
miles away.

Am I seeing a knife edge refraction or atmospheric refraction? It is 
curious because
signal strength stays at S9 until it disappears abruptly. If I were in a 
Fresnel zone
wouldn't the signal be less than when the sat is above the mountains?

Yes, I've checked my observer setup in NOVA and it is correct. LOS & AOS
seem to be accurate in other directions and antennas track perfectly.

Wish I could duplicate the phenomena in all directions :-) . Any thoughts?

Al, N7UB
LM1505

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