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ADCP-75-214 • Issue 2 • September 2006
Page 2
© 2006, ADC Telecommunications, Inc.
1.2 Functional Description
The basic purpose of a ClearGain Dual Inline TMA 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 TMA system improves the performance of the BTS by providing
12dB of uplink (reverse path) gain with a low noise figure. The ClearGain TMA system
provides visual and dry contact output alarming and lightning protection. Figure 2 depicts how
the system components are involved in system function.
Figure 2. System Function
BTS A
ANT B
BASE
STATION
MHU
21305-B
ClearGain PDU
RF SIGNALS
POWER
JUMPER
CABLES
SITE
ALARM
DC POWER
FAULT DETECTION
DC POWER
FAULT DETECTION
ANTENNA
COAXIAL
CABLE
RX/TX (A)
GROUND
BTS ANT
DC
Bias-T kit
Freq: 800 - 2200MHz
Temp: -40 to +65 C
Input: 5 to 24VDC
Max Current: 2A
P/N: 1344027
S/N: XXXXXXXXX
Date: YYYY/MM/DD
ASSEMBLED IN
KOREA
COAXIAL CABLE
TO ANTENNA
RX/TX (B)
BTS B
ANT A
ABG
INPUT
- +
ALARM
NO COM NC FAIL
RS485 MHU 1 MHU 2 MHU 3
OK OK OK
G
W
B
R
CONNECT
MHU
ClearGain