ITEM # 602100023500
DOCUMENT TYPE:
Operation and Installation Manual
REV:
A
DOC #:
602100023
PAGE 11 OF 16
TITLE:
Bi-Directional Amplifier System
Installation
Choose an optimal location. The choice of a location for the 48960 to reside is often
dictated by circumstance. These units can withstand a wide range of environmental
conditions, but a cooler environment will increase the life of the product. The 48960 is not
intended for outdoor operation without environmental protection. A central location to
minimize cable loss in any leg of the distribution network is ideal. In addition, a stacking room
near a riser for easy access to the roof and other floors will facilitate the installation.
Mount repeater upright, with the connections toward the floor. Ensure there is sufficient
space above and below the unit to allow airflow through the heat sink. Check to make sure
the AC power cord can reach the power source. Also, provide adequate bending radii for the
coaxial cables.
Install directional donor antenna and align with desired base site. A directional yagi,
corner reflector or panel antenna is highly recommended. The 48960 has filtering to prevent
out-of-band signals from causing interference; however, it is best to reduce the potential for
interference by directing the mobile signals only towards the desired base site.
Check the incoming donor signals. A spectrum analyzer is recommended to confirm that
the desired base TX (DL) signals are strong enough to achieve the desired output power.
Also check for strong undesired signals in the pass band or on the pass band edge; these
may cause overdrive and AGC gain reduction. The donor antenna may need to be realigned
to optimize the signal levels.
Install service area antenna(s). Determining the location and type of service area antennas
is part of the distribution system design. Generally, it is desired to minimize the amount of
coax that has to be installed. However, in buildings with extensive obstructions, it may be
necessary to install several service area antennas. For assistance with antenna placement,
contact RFS Applications Engineering.
Connect service antenna(s) to "Service" port via a 50-ohm coaxial cable. Multiple
service area antennas/radiating cable runs may be connected to the 48960. Splitters and
taps may be used to accommodate unique distribution systems. Size and type of cable are a
matter of choice. Typically, 1/2" Flexwell foam coax is used, plenum rated for inside buildings
and work areas. However, 7/8" cable may be used to reduce longitudinal loss. Superflex
cables are easier to install but have higher longitudinal loss. Fiber optic distribution systems
may be used with the 48960. Observe the input power requirements of the manufacturer.
RFS has all the components needed to complete even the largest installations. Visit our
website at:
www.rfsworld.com
, or call us.
WARNING
Do not connect AC power until antennas have been connected to both the base and
service area ports.
IMPORTANT
Observe Maximum Permissible Exposure cautions when determining the type and
location of all antennas.
