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User's Manual

ManualsBrandsPowerwave Technologies ManualsElectronicsThree Sector 1900 MHz RF Power Amplifier Cabinet
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044-05156 Rev C 20
4.5 G3S-1900-125 Amplifier Module
4.5.1 Overview
The G3S-1900-125 amplifier is a linear, feed-forward power amplifier that operates in the 60 MHz frequency band
from 1930 MHz to 1990 MHz. It is designed to operate in two continuous frequency blocks in the PCS band or an
instantaneous bandwidth of 20 MHz. A typical one-sector system is illustrated above. Each amplifier is a self-
contained plug-in module and is functionally independent of the other amplifier module. The amplifier modules are
designed for parallel operation to achieve high peak power output, and for redundancy in unmanned remote
locations. Each amplifier in the system can simultaneously transmit multiple carrier frequencies at 85 watts per
sector, for a combined output power of 170 watts.
Each amplifier output is an amplified composite signal of approximately 125 watts before losses. All phase and gain
corrections are performed on the signal(s) in the individual amplifier modules. Each amplifier module has alarm and
display LEDs that display the amplifier performance. If a failure or fault occurs in an amplifier module, it is displayed
on the individual amplifier front panel.
The amplifier typically draws 52 amps of current at rated output power, and approximately 25 amps with no RF
signals applied. Be sure to turn the amplifier off before removing it from the subrack to avoid damaging the
equipment or causing personal injury.
4.5.1.1 Controls, Indicators, & Interfaces
Primary +27 Vdc power is applied to the amplifier via a 100-amp circuit breaker (ON-OFF) located on the left side of
the amplifier front panel.
The plug-in amplifier module RF control and indicators, located in the center of the amplifier front panel between
the cooling fans, are shown below. The status and RF control functions are described in detail in the Amplifier
Module DC Indicators RF Switch Definition table. The alarms are described in detail in the Amplifier Module RF
Control and Indicators Definition table.
G3S-1900-125 Amplifier Module RF Control and Indicators