That is correct. So my next question: Can refraction be caused by
thermal ducting? -RickG

On Sat, Aug 8, 2009 at 1:27 PM, Faisal Imtiaz<fai...@snappydsl.net> wrote:
> LOL...
> I believe RickG is trying to point out that the correct word is "Refraction"
> and not "Scintillation"..
>
> Jack U. can add his comments into this.... Heat & Humidity cause Refraction
> to radio waves, ...that is why in long links they use Diversity Antenna
> Arrays.
>
> Regards
>
>
> Faisal Imtiaz
>
> -----Original Message-----
> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
> Behalf Of Mike
> Sent: Saturday, August 08, 2009 1:05 PM
> To: WISPA General List
> Subject: Re: [WISPA] 5.8GHz Link Loss
>
> 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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