BFW
Installation Guide
AN-30e & AN-50e Systems
2.1.2 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.
Figure 4: Antenna Mounting Locations
The recommended method for obtaining a satisfactory RF signal is to test a
number of antenna positions and measure the signal-to-noise ratio and received
signal strength (RSSI) for each position.
It is also important to test for RF interference at the intended rooftop or tower
installation site. RF interference can be caused by any wireless system in the area
that is operating in the same frequency band as the wireless. Accurate analysis
requires the use of specialized RF test equipment. The primary purpose of these
tests is to determine what channels are available for use on the wireless system.
2.1.3 Antenna Mounting and IF Cable Routing
When the antenna location has been established, plans should be made for
installation of the antenna mast or alternative mounting equipment. Plans should
be made for routing the IF cable from the radio/antenna to the terminal. In some
locations it may also be possible to install the IF cable on the outside of the
building. If the building must be penetrated to run the IF cable, it is important to
verify that building blueprints and/or drawings are up to date and accurate, and
that all permissions are obtained for the required modifications.
70-00042-01-02
Proprietary Redline Communications © 2005
August
2005
Page 11 of 34
