PowerWave G3L-800-25-001 Installation & Service Manual

®

INSTALLATION & SERVICE

MANUAL

MULTICHANNEL

POWER AMPLIFIER

G3L-800-25-001

25 WATTS AVERAGE POWER

Powerwave Technologies, Inc. Tel: [phone]
2026 McGaw Avenue Fax: [phone]
Irvine, CA 92614 Web Site: www.powerwave.com

044-05058 Rev. A

869-894 MHz

15 JANUARY 1999

TABLE OF CONTENTS

Par. Section 1 Page
No. General Description No.

1-1 Introduction .............................................................................................1-1

1-2 General Description ...............................................................................1-1

1-3 Functional and Physical Specifications...................................................1-1

Section 2

Installation

2-1 Introduction .............................................................................................2-1

2-2 Electrical Service Recommendations......................................................2-1

2-3 Unpacking and Inspection.......................................................................2-1

2-4 Installation Instructions............................................................................2-2

2-5 Amplifier Module Power, Alarm, Control, and RF Connector..................2-2

2-6 Amplifier Module RS-232 Connector.......................................................2-4

Section 3

Operating Instructions

3-1 Introduction .............................................................................................3-1

3-2 Initial Start-Up and Operating Procedures ..............................................3-1

Section 4

Principles of Operation

4-1 Introduction .............................................................................................4-1

4-2 RF Input Signal .......................................................................................4-1

4-3 RF Output Load.......................................................................................4-1

4-4 Amplifier Functional Description..............................................................4-1

4-4.1 Predriver Amplifier...................................................................................4-1

4-4.2 Three Stage Driver Amplifier...................................................................4-1

4-4.3 Main Amplifier .........................................................................................4-2

4-4.4 Alarm Monitoring and Control..................................................................4-2

4-4.5 Loop Control Circuit ................................................................................4-2

4-5 Amplifier Module Cooling........................................................................4-2

4-6 Power Distribution...................................................................................4-2

2

TABLE OF CONTENTS (Continued)

Par. Section 5 Page
No. Maintenance No.

5-1 Introduction .............................................................................................5-1

5-2 Periodic Maintenance..............................................................................5-1

5-3 Test Equipment Required For Test.........................................................5-1

5-4 Performance Test....................................................................................5-2

5-4.1 Amplifier Performance Test.....................................................................5-2

5-5 Field Replacement of the Module ...........................................................5-7

Section 6

Troubleshooting

6-1 Introduction .............................................................................................6-1

6-2 Troubleshooting ......................................................................................6-1

6-3 Return for Service Procedures................................................................6-1

6-3.1 Obtaining an RMA...................................................................................6-1

6-3.2 Repackaging for Shipment......................................................................6-1

LIST OF ILLUSTRATIONS

Figure Page

No. No.

1-1 G3L-800-25-001 Amplifier Showing Front Panel.....................................1-3

1-2 G3L-800-25-001 Amplifier Showing Rear Panel.....................................1-4

2-1 Power, Alarm, Control, and RF Connector (D-Subminiature 21WA4, Male

Connector)......................................................................................................... 2-3

2-2 RS-232 Connector (on Rear of G3L-800-25-001 Module)......................2-4

4-1 G3L-800-25-001 Multi Channel Power Amplifier Functional Block Diagram

4-2

5-1 G3L-800-25-001 Amplifier Test Setup Diagram......................................5-3

LIST OF TABLES

Table Page
No. No.

1-1 G3L-800-25-001 Multichannel Power Amplifier Functional Specifications1-2
2-1 Amplifier Module Power, Alarm, Control, and RF Connector Definition..2-3

2-2 Amplifier Module RS-232 Connector Definition.......................................2-4

5-1 Periodic Maintenance..............................................................................5-1

5-2 Test Equipment Required ....................................................................... 5-2

3

5-3 Multichannel Power Amplifier Test Data Sheet.......................................5-4

6-1 Troubleshooting ......................................................................................6-1

4

Section

1

GENERAL DESCRIPTION

1-1. INTRODUCTION

This manual contains information and procedures for installation, operation, and
maintenance of Powerwave’s model G3L-800-25-001 multichannel power
amplifier. The manual is organized into six sections as follows:

Section 1. General Description
Section 2. Installation
Section 3. Operating Instructions
Section 4. Principles of Operation
Section 5. Maintenance
Section 6: Troubleshooting

1-2. GENERAL DESCRIPTION

The G3L-800-25-001 (see figures 1-1 and 1-2) is a linear, multichannel power
amplifier that operates in the 25 MHz frequency band from 869 MHz to 894 MHz.
It is designed as a self-contained module with EMI containment for use in both
indoor and outdoor North American cellular base stations. The G3L-800-25-001
accepts single channel and transmit voice RF signals. The G3L-800-25-001 uses
an internally generated tone to optimize its performance. The system operating
band (A or B) is externally provided to the G3L-800-25-001 so that it knows where
the tone frequency is going to be. If the operating band is A, then a tone at B
band is generated; if the operating band is B, then a tone at A band is generated.

Each amplifier module has a power, alarm, and control connector that allows the
host system to monitor the amplifier module performance. Primary power for the
amplifier is +27 Vdc.

1-3. FUNCTIONAL AND PHYSICAL SPECIFICATIONS

Functional and physical specifications for the amplifier are listed in table 1-1.

5

Table 1-1. G3L-800-25-001 Multichannel Power Amplifier Functional Specifications

Frequency Range 869-894 MHz (25 MHz Bandwidth)
Maximum Average Input Power -13 dBm
Continuous Average Output Power 25 Watts
Spurious Emissions -60 dBc maximum (820 MHz – 900 MHz)

-50 dBc maximum (all other frequencies)
RF Gain
Gain Flatness:
Gain Variation
(Temperature and Voltage)

Output Protection: Mismatch Protected
Input Port Return Loss: -12 dB at any given power level
Operating Temperature: 0 ºC. to +50 ºC. (room ambient)
Storage Temperature: -40 ºC. to +65 ºC. (room ambient)
Operating Humidity: 5% - 95% Relative Humidity (noncondensing) not to exceed

Storage Humidity: 5% - 95% Relative Humidity (noncondensing)
DC Input, Alarm, and Control

Connector:
RF Input Connector: 21WA4 (male, D-sub)
RF Output Connector: 21WA4 (male, D-sub)
Phase
Phase Tracking
IMD -60 dBc (8 carriers, continuous phase random, equal carrier

Output Return Loss -18 dB (at any power level)
Harmonic Output -45 dBc (at any number of carriers, any power level.)
Communications RS-485 interface for control and status
Status Indicators: POWER ON:

MINOR:

MAJOR:
Internally Generated Alarms Over temp., DC over voltage, Overpower, VSWR, Loop fail.
Externally Generated Alarms Fan failure: Open collector pulled low = amp functioning

Hot Swap Capable Unit is capable of being replaced without shutting down power.
DC Input Power:
Power Supply Current 15 amps max. (at max. RF power out)
Overload Protection 20 A (circuit breaker / on-off switch)
Dimensions (inches): Height: 13.82; width: 2.64; depth: 15.57

57±0.5 dB

±0.5 dB (869 MHz – 894 MHz)
±0.7dB (From 25 ºC, across specified temperature range.)
±0.7dB (From 27 V, across specified voltage range.)

0.024 grams of water per gram of dry air.

21WA4 (male, D-sub)

180±5 degrees (measured at 880 MHz, 25 ºC, any power level)
±10 degrees (from 25 ºC, across specified temperature range)

spacing of 1.25 MHz. Any power up to maximum average output
power.)

Green LED = Power applied
Yellow LED = Minor alarm (loop failure)
Red LED = Major alarm (module failure and shut down)

Open collector floating high = amp failure

+27±0.1 Vdc, 260 mV p-p max. ripple, ≤350 watts

6

15.57

2.64

Figure 1-1. G3L-800-25-001 Amplifier Showing Front Panel

13.82

MINOR
MAJOR

7