User's Manual

RF Power Amplifiers
Andrew Corporation – Power Amplifier Group
Propriety – Use pursuant to Company Instruction
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Introduction
This document presents description of the Andrew Corporation 1900 Band HePA (High
Efficiency Power Amplifier) amplifiers. The HePA1900V3 amplifier is a high power,
RF amplifier intended to provide signal amplification and conditioning. The
HePA1900V3 amplifier is compatible with GSM and EDGE air interfaces operating in
U.S. domestic cell sites where FCC compliance is mandatory.
The Cell band (1930 MHz to 1990 MHz) HePA1900V3 RF power amplifier is capable of
amplifying a single carrier of different modulation types to a composite power level of
60Watts.
HePA1900 Specifications
The HePA1900 provide linear amplification of single-carrier signals in the cellular
frequency band. The 1900 Band HePA, have the following specifications:
Parameter
Specification
Operating RF Band 1930-1990MHz
In band RF gain 48dB
Input signal types GSM or EDGE single carrier
Input DC Power -48 VDC, nominal
DC voltage input range -38VDC to -58.5VDC
Rated Output Power
@ -38VDC to -58.5VDC input
60W average
/GSM & 45W average/EDGE
DC-RF Efficiency 28%, rated output power, nominal input voltage
Physical dimensions 10” x 14” x 3”
Weight < 15lbs
Cooling technique
External cooling when the Amplifier is placed in the
customer frame.
Temperature Range 0°C to +60°C meeting specifications.
Table 1 HePA1900V3 Specifications
Functional Blocks:
The Andrew HePA is comprised of the following functional areas:
− Preamplifier with unit gain control
This block gives to the unit its specified gain through 3 amplifier stages and helps
keeping this gain constant over temperature through a variable attenuator, this one being
controlled by the controller circuit.
− Amplifier power Final stage
This stage brings the signal to its desired high power level, it is the heart of the RF
section of the unit. The unit power, linearity and efficiency directly come from this
block.