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Installation
Determining of LOS
Determining Latitude and Longitude
Selecting a Antenna Location
Grounding
2-2
The first Fresnel zone is the area containing every point of which the distance
from the transmitter to any reflection point on the area and on to the receiver
is half a wavelength longer than the path of the direct signal.
The radius of the Fresnel zone is greatest at midpoint in the signal path. The
required clearance of obstacles at this point is therefore higher than at any
other point on the signal path.
The minimum required clearance is 0.6 of the first Fresnel zone.
The LOS should be clear and unimpeded for maximum efficiency in signal
transmission and reception.
Identification of the exact latitude and longitude of each site location is
required. This information is used in determining the distance between sites
and the expected Receive Signal Level (RSL).
The measurements are performed using a Global Positioning System (GPS)
Navigation Device, which is placed near the proposed location of the
antenna. When the GPS device is activated, latitude and longitude readings
transmitted from an overhead satellite will be recorded for at least 15 minutes
The Site Survey team will determine the optimum location for the antenna.
This should provide for ease of erecting and mounting the antenna as well as
unimpeded LOS to the next site. Factors that need to be taken into account
include:
• Loading weight for the roof
• Roof type (tar, cement, gravel, etc.)
• Proximity to the edge of the roof
• Local or Building ordinances prohibiting visibility of antennas
• Length of cable runs
• Grounding Connection Points
• Obstructions
• Accessibility
CAUTION:
Proper grounding of the antenna mounting provides protection
from lightning and reduces the risk of electrical shock. The Site Survey Team
will determine the source and connection points for the building–to–earth
ground in the vicinity of the antenna. Efficient grounding of the antenna
reduces electromagnetic interference to the operation of ODU and protects
against electrical discharges
Fujitsu and Fujitsu Customer Use Only
BroadOne GX4000 Manual (R3.0) issue 1.03
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