MA REV A
8
800 MHz of approximately 3.5 dB per 100 feet is used. The coax used should be a
nominal RG-8 type with a flame retardant rating except when installed in space
where moving air (heating and/or cooling) exists. In which case the coax must be
“plenum” rated. For long runs that exceed 150 feet, the use of low loss ½” coax is
desirable. Of primary concern is the isolation between the outside antenna and the
inside antennas.
Important note: A high degree of isolation must be afforded in order to prevent
any re-generative feedback in the system. Feedback of this nature causes the
amplifier to emit a continuous signal of maximum amplitude and could, in
some cases, interfere with normal operation of the cell
site. This isolation
should be in the order of 70 dB and is usually obtained by mounting the
outside antenna away from the edges of the roof. The use of window mounts
or other non-rooftop mountings should be avoided.
SAFETY PRECAUTIONS
For INDOOR use, an Omni-Directional Antenna with a maximum gain of 3dBi is
authorized for use with this unit.
Inside antennas must be positioned to observe minimum separation of 20 cm.
(~ 8 in.) from all users and bystanders. For the protection of personnel working
in the vicinity of inside (downlink) antennas, the following guidelines for
minimum distances between the human body and the antenna must be
observed.
The installation of an INDOOR antenna must be such that, under normal
conditions, all personnel cannot come within 20 cm. (~ 8.0 in.) from any
inside antenna. Exceeding this minimum separation will ensure that the
employee or bystander does not receive RF-exposure beyond the
Maximum Permissible Exposure according to section 1.1310 i.e. limits for
General Population/Uncontrolled Exposure.
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