Case Studies of Wireless Technologies in Mrida, Venezuela Part 2: 5'8 GHz

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Case Studies of Wireless Technologies in
Mérida, VenezuelaPart 2 5.8 GHz

• Ermanno Pietrosemoli
• Latin American Networking School
• www.eslared.org
• Universidad de los Andes
• Mérida- Venezuela
• ermanno_at_ula.ve

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Mérida Atmospheric Research Station (MARS)
Currently preparing the radiometer for
installation on Pico Espejo at Mérida, Venezuela
(8N, 71W, 4765 m asl). MIRA 2 will be part of
the joint Venezuelan and German project of the
Mérida Atmospheric Research Station (MARS). Two
ground-based microwave radiometers and an optical
instrument operating in DOAS mode will be
installed on Pico Espejo by the Forschungszentrum
Karlsruhe and the University of Bremen. FTIR,
LIDAR, and UV-A/B spectrometers will be deployed
at the nearby Instituto Astrofisico at an
altitude of 3600 m by the Alfred-Wegener-Institut,
Bremerhaven.
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Mérida Atmospheric Research Station (MARS)
                                                
                             (64 kB)View over
Pico Espejo at 4765 m. The instruments for
atmospheric research will be installed in the
building in the foreground.
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Mérida Atmospheric Research Station (MARS)
Pico Espejo is expected to provide excellent
conditions for ground-based millimeter wave
radiometry due to its low total column water
vapor content. Analyses using NCEP/NCAR data
covering the last 50 years suggest that nearly
year-round measurements at 270 GHz will be
feasible. Another advantage is the good
accessibility of this high altitude location by
the worlds highest cable car.A scientific,
technical, and organizational summary in
pdf-format for this new atmospheric research
station can be found at http//www-imk.fzk.de/imk2
/mira/Merida/SciSumMe.pdf
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MARS Link Requirements

• Provide Internet access at a mountaintop 4765 m
  altitude
• Avoid 2.4 GHz band because of interference
• Economic, environment and time constraints

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MARS link from Pico Espejo. 4765 m to Hechicera
1800 m
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MARS Link

• 5.8 GHz band chosen for the availability of less
  expensive equipment
• Altitude posed power dissipation problems that
  prevented the use of certain gear
• Alvarion chosen because of proven track of
  functioning on Everest

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MARS Link

• ODU consisting of integrated antenna and
  transceiver, connected to IDU by means of STP
  cable (up to 100m) that also provides DC power
• LED indicators aid in antenna pointing
• IDU provides power and has one RJ-45 connection
  to 10/100 baseT switch or hub
• 10 degrees downtilt required by this link

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Pico Espejo, 4765 m, Ermanno Pietrosemoli
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Javier Triviño adjusting downtilt with clinometer
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Connection to the wired network
Hechicera, top of university building, Maricela
Guerrero, 1800 m
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Professor Pedro Hoffmann sending E-mail from Pico
Espejo
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MARS view

• A webcam has been installed at Pico Espejo that
  shows an image of the cable car and Pico Bolivar
  (5000 m altitude) and can be acessed on line at
• http//www-imk.fzk.de/imk2/mira/home.html