Functional Description - ADC ClearGain User Manual

ADCP-75-154 • Issue 3 • August 2006
The MHU may be any of the three types shown. One PDU may support multiple MHUs of the
same frequency. Each MHU requires one Bias-T. The ClearGain system also includes power
cables and alarm cables.
1.2

Functional Description

The basic purpose of a ClearGain tower mounted amplifier system is to amplify the uplink
signal just after the antenna. This is done to compensate for the loss in signal strength that
occurs in passage of the signal through the coaxial cable to the Base Transceiver Station (BTS)
at the base of the tower. The ClearGain system also provides alarming and lightning protection.
Figure 2 depicts how the system components are involved in system function. As shown:
COAXIAL
CABLE
Page 2
© 2006, ADC Telecommunications, Inc.
ANTENNA
BASE
STATION
RF SIGNALS
DC POWER
FAULT DETECTION
BTS ANT
Bias-T kit
Freq: 800 - 2200MHz
Temp: -40 to +65 C
ASSEMBLED IN
Input: 5 to 24VDC
KOREA
Max Current: 2A
Date: YYYY/MM/DD P/N: 1344027
S/N: XXXXXXXXX
DC
RX/TX (A)
GROUND
Figure 2. System Function
MHU
FILTER/LNA
UPLINK
DOWNLINK
ANT
BTS
JUMPER
CABLE
SITE
ALARM
POWER
ClearGain PDU
Power Distribution Unit
MHU
+ Ð
NO COM NC FAIL MHU
INPUT ALARM DISCONNECT MHU 1
DC POWER
FAULT DETECTION
GROUND
OK OK OK OK OK OK
MHU 2 MHU 3 MHU 4 MHU 5 MHU 6
21487-A