So, it would be good to pay attention to the thermal ducting reports as another tool towards a better understanding of issues with your network? -RickG
On Sun, Aug 9, 2009 at 12:02 PM, Faisal Imtiaz<fai...@snappydsl.net> wrote: > > Can refraction be caused by thermal ducting? -RickG > ------- > And the answer is Absolutely YES ..... !! > > > Faisal Imtiaz > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of RickG > Sent: Sunday, August 09, 2009 11:52 AM > To: fai...@snappydsl.net; WISPA General List > Subject: Re: [WISPA] 5.8GHz Link Loss > > 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?" >> >> >> >> >> ---------------------------------------------------------------------- >> ------ >> ---- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> ---------------------------------------------------------------------- >> ------ >> ---- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> >> >> ---------------------------------------------------------------------- >> ---------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> ---------------------------------------------------------------------- >> ---------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! Join today! > http://signup.wispa.org/ > ---------------------------------------------------------------------------- > ---- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
