044-05236 Rev A
1-1
Chapter 1
Product Description
1.1
Introduction
This manual contains information and procedures for the installation, operation, and maintenance of
the G3L-850-160 Multi-Carrier Power Amplifier (MCPA).
1.2
Scope of Manual
This manual is intended for use by service technicians familiar with similar types of equipment. It
contains service information required for the equipment described and is current as of the printing
date. Changes which occur after the printing date may be incorporated by a complete manual revision
or alternatively as additions.
The manual is organized into the following chapters:
1.3
Product Description
The MCPA shown in Figure 1-1 is a linear, feed-forward multi-carrier power amplifier that operates in
a 25MHz frequency band from 869 MHz to 894 MHz with an instantaneous bandwidth of 25 MHz. The
instantaneous bandwidth is the maximum frequency band in which any two or more signals can
occupy. The instantaneous bandwidth of the MCPA is set automatically.
The MCPA is modular in design and ideally suited for use in GSM, EDGE, CDMA, and W-CDMA base
stations. The MCPA provides a gain of 63 dB to provide a 160 watt output. Refer to Figure 1-2 for the
MCPA functional block diagram. Refer to Chapter 5 for the MCPA specifications.
1.4
Functional Description
The MCPA is a self-contained module typically operated in parallel with other identical MCPAs as part
of a subrack assembly.
The MCPA consists of the following major functions:
•
Preamplifier
•
Main and error amplifiers
•
Feed-forward loop control circuits
•
Pilot tone generator
Chapter 1 - Product Description
Chapter 2 - Controls and Indicators
Chapter 3 - Installation
Chapter 4 - Maintenance
Chapter 5 - Specifications
