ADC Tower-mounted Amplifier ClearGain - Manual (Page 2)

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ClearGain ® AISG Compliant TMAs
Americas
2 w w w . a d c . c o m • + 1 - 9 5 2 - 9 3 8 - 8 0 8 0 • 1 - 8 0 0 - 3 6 6 - 3 8 9 1
BtS
Ret Antenna
Base
Station
ANt Ret 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
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
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 wall-
mounted 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.