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 850 Band HePA (High
Efficiency Power Amplifier) amplifiers. The HePA850 amplifier is a high power, RF
amplifier intended to provide signal amplification and conditioning. The HePA850
amplifier is compatible with GSM and EDGE air interfaces operating in U.S. domestic
cell sites where FCC compliance is mandatory.
The Cell band (869 MHz to 894 MHz) HePA850 RF power amplifier is capable of
amplifying a single carrier of different modulation types to a composite power level of
60Watts.
HePA850 Specifications
The HePA850 provide linear amplification of single-carrier signals in the cellular
frequency band. The HePA850 have the following specifications:
Parameter Specification
Operating RF Band 869-894MHz
In band RF gain
48dB (Tolerance ±2dB)
Input signal types GSM or EDGE single carrier
Bandwidth
20dB Pass Bandwidth ( Duplexer applied): 32MHz
Occupied BW: GSM 248KHz & EDGE 245KHz
Input DC Power -48 VDC, nominal
DC voltage input range -38VDC to -58.5VDC
Input/Output Connector 50 Ohm /50Ohm
Rated Output Power
@ -38VDC to -58.5VDC input
60W average for GSM/ 45W average for 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 HePA850 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