ADC Amplifier ClearGain User Manual

ClearGain® AISG Compliant TMAs

Americas

As mobile usage continues to increase, service providers are faced
with the challenge of optimizing and expanding their wireless
networks to provide new and existing services. ADC’s ClearGain®
Tower-Mounted Amplifiers (TMAs) minimize the cost of network
expansion and improve the quality of service, allowing carriers to
increase profitability from new and existing services.

ClearGain TMAs improve signal quality by boosting the uplink (RX) signal of a mobile system
immediately after the antenna. This compensates for the loss in signal strength that occurs
when the signal is passed through the coaxial feeder cable to the base transceiver station (BTS)
at the base of the tower. These TMAs perform this amplification with the lowest possible noise
contribution, resulting in a substantial increase in receiver performance and an improvement in
overall coverage. These improvements in quality of service allow mobile subscribers to place more
calls, make longer calls, and successfully complete calls in an expanded geographic area, resulting
in increased revenue.

SPEC SHEET

ClearGain TMAs are fully AISG Compliant. Therefore, the TMA system allows for Remote Electrical
Tilt (RET) signals to be injected into the system at the BTS and extracted out of the TMA from
a special RET connector. The benefit of this system is that the carrier does not have to run RET­specific cables up the tower resulting in less wind loading, fewer components, and lower costs.

Features:

• Highly advanced LNA amplifies RX signal for
improved receiver performance and increase
in coverage

• Fully AISG Compliant

• Dual duplex feature reduces the number of
feeder cable runs by providing simultaneous
operation of TX and RX with low TX loss

• Advanced filtering maintains the lowest
possible noise figure for improved quality
of service

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• Slim, stackable design conserves tower
space and reduces tower-related costs

• Aluminum sleeve construction protects
components from the elements

• Modular system is fully compatible with all
base stations

• Power and alarming for up to six masthead
units is provided from a single unit at the
base station

ClearGain® AISG Compliant TMAs

BTS RET Antenna

Base

Station

ANTRET

BTS

+ -

INPUT

NO COM NC

ALARM

RET

Power Distribution Unit

MHU1 MHU2 MHU3 MHU4 MHU5 MHU6

ClearGain

®

AISG TMA

Antenna

RET Antenna

Control Device

Bias-T

BTS

Americas

®

Introduction

TMAs improve signal quality by boosting the
uplink (RX) signal of a mobile system immediately
after the antenna. This compensates for the loss
in signal strength that occurs when the signal
is passed through the coaxial feeder cable to
the base transceiver station (BTS) at the base
of the tower. ClearGain TMAs perform this
amplification with the lowest possible noise
contribution, resulting in a substantial increase
in receiver performance and an improvement in
overall coverage. These improvements in quality
of service allow mobile subscribers to place more
calls, make longer calls, and successfully complete
calls in an expanded geographic area, resulting in
increased revenue.

The TMA system allows for RET signals to be
injected into the system at the BTS and extracted
out of the TMA from a special RET connector.
The benefit of this system is that the carrier does
not have to run RET-specific cables up the tower
resulting in less wind loading, fewer components,
and lower costs.

The ClearGain TMA system is modular, consisting
of a masthead unit (MHU), a power distribution

Tower-Mounted Amplifier

unit (PDU) and a Bias-T Unit, providing full
compatibility with all base stations.

System Overview

The ClearGain MHU offers dual duplex operation
and incorporates a highly advanced fixed-gain,
low-noise amplifier (LNA) and high performance
filters for added reliability. The MHU amplifies
the entire band to maximize signal quality and
optimize coverage.

The ClearGain MHU features a slim, lightweight
design. This a allows two ClearGain TMAs to be
mounted with one set of brackets, conserving
valuable and costly tower space and reducing
clutter on the tower. The TMA is protected with a
strong, aluminum sleeve construction designed to
ensure superior weather protection and resistance
to corrosion, resulting in increased reliability.

In the ClearGain TMA system, DC power and
RET signals are supplied to the MHU from a
ClearGain PDU. The PDU also provides alarming
and monitoring of the feeder cable and up to six
MHUs from a single unit. The flexible design of
the ClearGain PDU allows it to be rack- or wall­mounted on the side of a BTS cabinet.

An external Bias-T Unit is used in conjunction
with the ClearGain PDU. The Bias-T inserts DC
power onto the coaxial cable and extracts alarm
and monitoring signals from the coaxial cable.

ClearGain

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ClearGain® AISG Compliant TMAs

Americas

DD1900 Full Band AISG Compliant Unit Typical Specifications

ELECTRICAL
Nominal Impedance of RF Inputs and Outputs:
Frequency Range
TX: 1930-1990 MHz
RX: 1850-1910 MHz
Passband (RX)
Gain: 12 dB
Noise Figure: 1.6 dB
Dynamic Range
Input at 1 dB Gain Compression: +3 dBm
IIP3: +13 dBm
Max Input Power: +10 dBm
1915 MHz Rejection: <15 dB
1916 MHz Rejection: <30 dB
Bypass Inserion Loss: 2.0 dB
Isolation in Tx Path: 80 dB
Rejection 824-894 MHz: 80 dB
Insertion Loss of TX Path (TX to Antenna):
Passband Return Loss
TX Band: >18 dB
RX Band: >18 dB
Intermodulation:
Maximum Input Power (RMS Power):
Tx Filter Rejection in Rx Band:

50 Ohm

.4 dB

-120 dBm
250 W
40 dB

®

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Tower-Mounted Amplifier

ClearGain

POWER
Operational Voltage:
Operational Current:
Alarm Current Level:

PHYSICAL
Dimensions (HxWxD):
Weight:
Color:

Silver

Housing:

CONNECTORS
Antenna Connector:
BTS Connector:

ENVIRONMENTAL
Operating Temperature:
Lightning Protection:
Vibration
Storage: ETS3019-1-1
Transport: ETS3019-1-2
Operation: ETS3019-1-3

REGULATORY
EMC:

ETS300 342-2

APPROVALS
FCC:

Part 15, Class A

UL:

1950

QUALITY
MTBF:

900,000 hours

7 to 15 Vdc
140 ± 10 mA
350 ± 20 mA

297 mm x 287 mm x 70 mm

5.5 kg (12.1 lbs)

Aluminum

7/16 DIN female
7/16 DIN female

-40ºC to +60ºC
IEC61000-4-5

ADC is an active member

of the Antenna Interface

Standard Group.

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