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User's Manual

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AN-50e
user manual
70-00033-02 Proprietary Redline Communications © 2004 November 2004
Page 31 of 96
5.3 General Site Survey
5.3.1 Site Path Survey
The RF signal path profile is required to determine the location, height, and aiming
requirements for installation of the wireless system radio/antenna.
Site Path Profile
The completed path profile should include the following information:
Table 8: Site Path Profile
Antenna Description
Location Instructions to identify the location for installing the antenna mast.
May include blueprints and specify material list.
Height
Mounting height for antenna.
Azimuth Horizontal aiming direction for the antenna (magnetic or GPS
compass)
Elevation angle
Vertical aiming for antenna (spirit level).
Expected RSSI Use the Link Budget tool to determine the expected receive signal
strength (RSSI).
A critical parameter to consider is the range at which communicating wireless
systems are required to operate. Range performance is determined by empirical
formulas that consider a number of equipment and environmental factors.
The Link Budget Tool will calculate expected performance of the link for a
specified range. Ensure that the installation sites will meet performance
requirements before moving to the next step.
Identify Best Path
The next step is to conduct a general site survey to determine the location for the
antenna. This involves a survey to identify building and structures that can be used
to mount an antenna. Refer to the specification for the maximum IF cable length.
For maximum performance in OLOS deployment, it is recommended to mount the
antenna in a location where there is direct line of sight to the receiving wireless
system. If the obstruction in the path is not exceptionally high, it may be possible
to aim both antennas near the top of the obstruction. The antenna should be
positioned to provide maximum clearance within the first Fresnel zone of the
direct path (as high as possible, on either a tall building or tower).
The wireless system also supports installation in non-line-of-sight (NLOS)
conditions. A satisfactory multipath RF signal can often be obtained by directing
each antenna towards a structure in sight of both communicating wireless systems.