Andrew Wireless Innovations Group MRB-LMR 用户手册

The duplexers (see Figure 2-4) provide isolation between uplink and
downlink paths, and band-limit the signals that are either passed to the donor
hardware, or transmitted at the mobile antenna.  The small repeater duplexer
provides adequate UL/DL isolation. The mobile duplexer offers low insertion
loss to maximize downlink output power and uplink noise figure.  Forward
and reverse directional coupler outputs are provided on the mobile duplexer.
The coupler outputs are routed to the VSWR module when that option is
installed.

The RF cables are a critical part of the MR Booster, particularly in the
downlink function.  Low loss provides maximum output power and cable
propagation delays must be properly controlled so that the amplifiers are
combined with low phase error.

Fan Assembly (High-power only)

Dual DC fans (not shown) maintain a low cabinet temperature in the high
power option.  The fans are sealed to withstand all weather conditions. The
plenum and ducting structure of the booster is designed to move air over all
heat fins, even if one fan fails.  The fans can be disabled or operated at low
speed for climates where over-heating will not be a problem.  The logic
controller provides the fan interface.

VSWR Module (Optional)

The VSWR module (not shown) monitors the downlink output VSWR. The
customer is alerted to potentially damaging antenna mismatch.  The module
receives 

±

 12 VDC from the controller and coupled outputs from the mobile side

duplexer.  The coupled signals are processed and an analog voltage
representative of the output VSWR is routed to the logic controller.

CAUTION: Never substitute RF cables in the booster. Use only
proper MIKOM part numbers.