Scintillation, for our purposes, is similar to when you see a mirage 
on a highway in front of you, usually on a hot day, and not uncommon 
across deserts.  The wavering of the light waves is the same thing 
that happens to radio signals, more-or-less.

I once had a canopy, with dish mounted on a high roof shooting across 
a white flat roof.  After the install, the customer would drop lots 
of packets.  We moved it 4 feet higher to change the angle of 
incidence and it stayed stable.  That's one reason all of this seems 
black magic at times.

Regarding the tropo propagation, as a ham radio operator, at times 
the uhf and vhf bands would open from SW FL all the way across the 
Gulf of Mexico and we could talk to hams in Texas, Alabama, Louisiana 
and others at times.  Many times this went on for hours and sometimes days.



At 10:19 AM 8/8/2009, you wrote:
>Which definition of scintillation applies?

>     * Scintillation or twinkling are generic terms for rapid
>variations in apparent brightness or color of a distant luminous
>object viewed through the atmosphere.
>       en.wikipedia.org/wiki/Scintillation_(astronomy)
>     * scintillate - twinkle: emit or reflect light in a flickering
>manner; "Does a constellation twinkle more brightly than a single
>star?"




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