User's Manual

UM-0825 11
3. Signal Booster Block Diagram
This Signal Booster is basically a bi-directional amplifier, the downlink signals are received by the Signal
Booster from cell site by the donor antenna, filtered by its internal duplexers and IF filters units, amplified by
low noise amplifier(LNA) and downlink PA unit, and then sent via the server antenna to the area to improve
mobile signals for mobile phones.
The uplink signal of mobile devices from the coverage area is input via the server antenna, then filtered by
duplexers and IF filters units, amplified by the uplink low noise amplifier (LNA) and the uplink PA unit and
finally sent via the donor antenna to the cell site tower.
A detector in the PA stage measures continuously the output level. The signals from this detector is used
by the automatic gain control(AGC), to supervise and, if necessary, reduce the chain gain, in order to keep
the output power level, under the maximum.
All the parameters are supervised by a microcontroller.
4. Installation
Mounting the Signal Booster
The Fiplex Compact Signal Booster is designed for outdoor usage with a weather proof outdoor cabinet
that can be mounted without any kind of shelter from rain, snow or hail.
However, to improve reliability, it is recommended to mount the Signal Booster on a site with some kind of
shelter from direct exposure to sun, rain, snow and hailing.
We extremely recommend not operating the Signal Booster under very bad weather conditions, such as:
- Intense rainfall, snowfall or hail
- Storm or high wind
- Extremely low or high temperature
- High humidity of the air