1.2Functional 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.
ANTENNA | COAXIAL CABLE |
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ClearGain 
MHU
BASE | BTS A | BTS B | |
STATION | |||
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JUMPER
CABLES
COAXIAL
CABLE
RF SIGNALS
DC POWER 
FAULT DETECTION
SITE
POWER ALARM
ClearGain PDU
BTS | ANT |
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| Freq: 800 - 2200MHz |
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ASSEMBLED IN | Temp: |
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Input: 5 to 24VDC |
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KOREA | Max Current: 2A |
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Date:YYYY/MM/DD | P/N: 1344027 |
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| S/N: XXXXXXXXX |
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DC | G | W |
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| B | R |
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| - | + | NO COM NC | FAIL | G A B | MHU | OK | OK | OK |
| INPUT | ALARM |
| RS485 | CONNECT | MHU 1 | MHU 2 | MHU 3 | |
GROUND | RX/TX (A) |
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| DC POWER | |
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| FAULT DETECTION |
Figure 2. System Function
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© 2006, ADC Telecommunications, Inc.