Powerwave Technologies 5JS0068 Power Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc Power Amplifier I GENERAL DESCRIPTION

UserManual.wiki >

Powerwave Technologies >

5JS0068 User Manual HTML Version

Users Manual

1930-1990 MHz

Installation & Service Manual

G3L-1929- Multi-Carrier Power Amplifier

044-05138 Rev. A May 2003

Preliminary

G3L-1929- Installation & Service Manual

May 2003

Powerwave Technologies, and the Powerwave logo are registered trademarks

Powerwave Technologies, Inc. reserves the right to make changes to the documentation and

equipment, including but not limited to component substitution and circuitry changes. Changes

that impact this manual may subsequently be incorporated in a later revision of this manual.

Powerwave Technologies, Inc. Tel: (714) 466-1000

1801 E. St. Andrew Place (800) 473-1720

Santa Ana, CA 92705 Fax: (714) 466-5800

Web Site: www.powerwave.com

044-05138 Rev. A ii May 2003

G3L-1929- Installation and Service Manual

Section 1. General Description

1-1 Introduction

This manual contains information and procedures for the installation and operation of Powerwave

Technologies, Inc.’s G3L-1929-120 Multi-Carrier Power Amplifier (MCPA). This manual is organ-

ized into the following sections:

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-1929-120 Power Amplifier shown in figures 1-1 through 1-6, operates in the 60 MHz fre-

quency band from 1930 MHz to 1990 MHz with channel spacing of 12.5 kHz. The amplifier provides

a typical gain of 60 dB to produce a typical output of 60 Watts (47.8 dBm). The G3L-1929-120 am-

plifier generates approximately 2300 BTUs of heat at full power. The amplifiers are modular in

design, and ideally suited for use in GSM base stations.

1-3 Ordering Information

Table 1-1 lists major system component numbers and descriptions for use in ordering booster

amplifiers or components.

Table 1-1 Major System Components

Component

Number

Description

G3L-1929-120 120-Watt Amplifier, +27 VDC

1-4 Functional and Physical Specifications

Electrical, mechanical, and environmental specifications for the G3L-1929-75 amplifier are listed

in tables 1-2, 1-3, and 1-4 respectively.

1-5 Equipment Changes

Powerwave Technologies, Inc. reserves the right to make minor changes to the equipment, in-

cluding but not limited to component substitution and circuitry changes. Changes that impact this

manual may be incorporated in a later revision of the manual.

044-05138 Rev. A 1-1 May 2003

G3L-1929- Installation and Service Manual

Table 1-2 G3L-1929-75 Amplifier Electrical Specifications

Frequency Range 1930 - 1990 MHz

Channel Spacing 12.5 KHz

Output Power: +50.8 dBm (120 Watts)

Input Power -10.0 dBm max.

RF Gain +60 dB ±1.0 dB @ +27Vdc, 25° C

RF Gain Flatness over the

operating frequency range ±0.1 dB over any 1.25 MHz (over the frequency range).

Gain Flatness: ±0.5 dB (1930 MHz – 1990 MHz)

Normal Operating Voltage +27 Vdc ±1V Nominal (±5%) 1Vpp ripple (100-120 Hz) max.

Current Consumption: 27.5 Amps @ 27 Vdc, 25 °C, Prf = 60 Watts average

32 Amps @ 27 Vdc, 25 °C, Prf = 75 Watts maximum

Abnormal Operating Voltage +21 Vdc to below +26 Vdc. Above +28 Vdc to +29 Vdc.

RF Gain variation by Temp &

Voltage +1dB; 0 to 50°C

Gain Variation Over Dynamic

Range ±0.5 dB max./20 dB for 0 to -20 dB rated power output

Intermodulation Distortion

In-Band Spurious

-65 dBc min. (Main signal power to Spurious @ (12.5 kHz)

-55 dBc min @ +23 to +24 Vdc

Input/Output VSWR. 1.5: 1 max @ 65° C

Load Stability Infinite VSWR. all phases

Output Isolation 20 dB min.

044-05138 Rev. A 1-2 May 2003

G3L-1929-75 Installation and Service Manual

Table 1-3 G3L-1929-120 Amplifier Mechanical Specifications

Physical Dimension of

MCPA (inches)

Front panel: 13.98 W x 3.90 H x 0.118 D

Body: 11.61 W x 3.75 H x 17.56 D

Weight Approximately 28.6 pounds (13 killograms)

Connector Type D-sub, Hybrid, Plug-in Type RF connector: PKZ 26-0020 series

straight plug type (Phoenix Co.) refers to attached drawing.

MCPA Front Panel

Switch On/Off Switch and +27 Vdc Power Indicator

Pin Outs

A1 RF Input (Coaxial Contact)

A2 +27 Vdc (Power Contact)

A3 Ground (Power Contact)

A4 RF Output (Coaxial Contact)

1 TX H 10 +27 V

2 TX L 11 COM SV

3 GND 12 AMP AO

4 RX H 13 AMP A1

5 RX L 14 AMP A2

6 GND 15 AMP A3

7 HERE LPA 16 NC

8 FF LPA 17 NC

21WA4 Connector

Description

9 RESERVED

Front Panel LED Display: LED type: SMD

RUN Green (When MCPA is enabled)

ALM Red (When any alarm occurred, LED is on)

DC Green (When DC Power is ON, LED is on)

Table 1-4 G3L-1929-120 Amplifier Environmental Specifications

Operating Temperature -10 to + 60° C

Storage Temperature -40 to + 85° C

Relative Humidity 5 to 95% RH (non-condensing)

044-05138 Rev. A 1-3 May 2003

G3L-1929- Installation and Service Manual

Figure 1-1 Model G3L-1929-120 Amplifier Front Isometric View

Figure 1-2 Model G3L-1929-120 Amplifier Rear Isometric View

044-05138 Rev. A 1-4 May 2003

G3L-1929- Installation and Service Manual

Figure 1-3 Model G3L-1929-120 Amplifier Top View

Power

ON/OFF

Switch

LED

Indicator

Figure 1-4 Model G3L-1929-120 Amplifier Front Panel

044-05138 Rev. A 1-5 May 2003

G3L-1929- Installation and Service Manual

21WA4

Connector

Figure 1-5 Model G3L-1929-120 Amplifier Rear Panel

Figure 1-6 Model G3L-1929-120 Amplifier Side View

044-05138 Rev. A 1-6 May 2003

G3L-1929- Installation and Service Manual

Section 2. Installation

2-1 Introduction

This section contains unpacking, inspection, installation instructions and recommendations for

the G3L-1929-120 Multi-Carrier Power Amplifier (MCPA). It is important that the licensee perform

the following tasks correctly.

1. Carefully read all material in this section prior to equipment unpacking or installation.

2. Also, read and review the operating procedures in section 3 prior to installing the equipment.

3. If applicable, carefully review the government and local codes as they apply to your installa-

tion.

2-2 Site Survey

Powerwave Technologies recommends that site surveys be performed by qualified individuals or

firms prior to equipment ordering or installation. Performing a detailed site survey will reduce or

eliminate installation and turn-up delays caused by oversights. Pay particular attention to power

plant capacity, air conditioning needs, and RF/DC cabling/breaker requirements.

2-3 Electrical Service Recommendations

Powerwave recommends that:

• Proper AC line conditioning and surge suppression be provided on the primary AC input to

the +27 Vdc power source.

• All electrical service should be installed in accordance with any applicable codes, and good

engineering practice.

• Straight, short ground runs be used.

• The electrical service must be well grounded.

Each amplifier system should have its own circuit breaker, so a failure in one does not shut off

the whole installation. Circuit breakers should be capable of handling the anticipated inrush cur-

rent, in a load center with a master switch.

2-4 Air Conditioning

Each G3L-1929-120 amplifier generates approximately 2300 BTUs of heat at full power. A 1-ton

air conditioner sufficiently handles 12,000 BTUs of heat.

2-5 Unpacking and Inspection

This equipment (as applicable) has been operated, tested and calibrated at the factory. Carefully

open and remove the MCPAs from their respective containers. Retain all packing material that

can be reassembled in the event that the unit must be returned to the factory. Please perform the

following steps:

CAUTION

Exercise care in handling equipment during inspection to prevent damage caused by

rough or careless handling.

044-05138 Rev A 2-1 May 2003

G3L-1929- Installation and Service Manual

1. Visually inspect the MCPA for damage that may have occurred during shipment.

2. Check for evidence of water damage, bent or warped chassis, loose screws or nuts, or ex-

traneous packing material in the connector(s).

CAUTION

Before applying power, make sure that all connectors are secure. Make sure that the

input and output are properly terminated at 50 ohms. Do not operate the system with-

out a load attached. Refer to section 1, table 1-2 for input power requirements. Exces-

sive input power may damage the equipment.

If possible, inspect the equipment in the presence of the delivery person.

If the equipment is damaged:

 The carrier is your first area of recourse.

 A claim should be filed with the carrier once the extent of any damage is assessed. We can-

not stress too strongly the importance of IMMEDIATE careful inspection of the equipment

and the subsequent IMMEDIATE filing of the necessary claims against the carrier, if neces-

sary.

If the equipment is damaged and must be returned to the factory:

 Please write or phone for return authorization.

 Powerwave may not accept returns without a return authorization.

Claims for loss or damage may not be withheld from any payment to Powerwave nor may any

payment due be withheld pending the outcome thereof. WE CANNOT GUARANTEE THE

FREIGHT CARRIER'S PERFORMANCE

2-6 Installation Instructions

Proceed with the installation of the G3L-1929-120 Amplifier as follows:

WARNING

Turn off external primary DC power before connecting DC power cables.

1. Inspect the 21WA4 male combo connector on the rear of each amplifier. Verify that all pins

are straight, no pins are recessed, and that the alignment shield is not bent.

2. Place the amplifier power On/Off switch in the “Off” position (figure 2-1).

CAUTION

Do not slam the amplifier into the subrack. Forcing the amplifier into the subrack at to

fast a rate may cause the pins on the 21-D sub connector of the amplifier to become

recessed or broken.

3. Install the amplifier(s) into their respective subrack. There are no slot priorities, so any slot

will function equally. Tighten the thumbscrews to secure the amplifier(s) to the subrack.

WARNING

Check your work before applying DC voltage to the amplifier. Make certain all con-

nections are tight and correct.

044-05138 Rev A 2-2 May 2003

G3L-1929- Installation and Service Manual

4. Measure primary DC input voltage. DC input voltage should be +27 Vdc ±1.0 Vdc. If the DC

input voltage is above or below the limits, call and consult Powerwave before you turn on

your amplifier system.

5. Refer to section 3 for initial turn-on and checkout procedures.

Power switch positions:

Off/On/Reset (momentary)

Front

Figure 2-1 G3L-1929-120 Power Switch Functions

2-7 Amplifier Module Power, Alarm, Control, and RF Connector

The power, alarm, control, and RF connections on the amplifier are made through a 21WA4 male

connector, located on the rear of the amplifier, and are listed and described in table 2-1 below.

Table 2-1 G3L-1929-120 MCPA Alarms & Controls

Items Specifications Remarks

Alarms & Controls TTL Level; +5 Volts

Buffer: 74ABT244 (5 V) - recommended

Deletion Alarm When unit does not exist (HEAR_PAU)

Equipped: GND Deletion OPEN

D-Line

Function Fail Alarm When unit does not exist (HEAR_PAU)

Normal: High Abnormal GND

D-Line

VSWR Alarm 3:1 (6 dB ± 1dB) @ 35 dBm-48 dBm Output Power. PAU

remains normal operation when this alarm condition disap-

pears (NOT shutdown)

RS-485

High Temp. Alarm This alarm only at +75 ºC +5

ºC/

/-0

ºC (heat-sink temp.) RS-485

Over Power Output

Alarm

Output power is greater than +48.5 dBm ±0.5 dB (70.8 W).

MCPA recovers when the alarm condition disappears.

(NOT shutdown).

RS-485

DC Fail Alarm +20.5 Vdc ± 0.5V or +29 Vdc ± 0.5V. When this alarm oc-

curs the MCPA shuts down

RS-485

Loop Fail Alarm When an alarm occurs on the feed forward path. RS-485

EN/DISABLE Reserved RS-485

044-05138 Rev A 2-3 May 2003

G3L-1929- Installation and Service Manual

Section 3. Operating Instructions

3-1 Introduction

This section contains a description of the G3L-1929-120 Multi-Carrier Power Amplifier (MCPA)

controls and indicators and initial start-up and operating procedures.

3-2 Controls and Indicators

The controls and indicators for the G3L-1929-120 Power Amplifier consist of the primary power

On/Off/Reset switch and status indicator LED as shown in figure 3-1.

Power

On/Off/Reset

Toggle Switch

Status

Indicator

LED

Figure 3-1 G3L-1929-120 Controls and Indicators

3-2.1 Status Indicator LED

The status indicator LED is located on the MCPA front panel as shown in figure 3-1. The LED

has tri-color capability: red, yellow, and green. The LED’s blinking frequency is 0.5 – 1 Hz with a

duty cycle of 45 – 55%. The LED indicates the status of the MCPA as listed in table 3-1.

Table 3-1 Status Indicator Colors

LED Color MCPA Status

Red (stable) Manual main-switch turned standby

and no TCP/UDB connection estab-

lished

Red (stable) LED lighting period 1.5±

±0

c Manual main-switch turned ON or

MCPA is resetting

Yellow (blinking) MCPA in self-heating state

Yellow (stable) In startup phase, MCPA is in standby

state and before state change mes-

sage from MCPA

LED state as it was before disconnection TCP/IP connection is lost for two

minutes

Yellow (stable) TCP/IP connection is lost and MCPA

is in standby state

044-05138 Rev. A 3-1 May 2003

G3L-1929- Installation and Service Manual

3-3 Initial Start-Up and Operating Procedures

To perform the initial start-up, proceed as follows:

1. Verify that all input and output cables are properly connected.

CAUTION

Before applying power, make sure that the input and output of the amplifier are prop-

erly terminated at 50 ohms. Do not operate the amplifier without a load attached. Re-

fer to table 1-1 for input power requirements. Excessive input power may damage the

MCPA.

NOTE

The output coaxial cable between the amplifier and the antenna must be 50-ohm co-

axial cable. Use of any other cable will distort the output.

2. Turn on the supply that provides +27 Vdc to the amplifier.

3. Place the power On/Off/Reset switch on the amplifier front panel to the On (middle) position.

4. Allow the amplifiers to warm up for at least 20 minutes before taking power readings.

044-05138 Rev. A 3-2 May 2003

G3L-1929- Installation and Service Manual

Section 4. Principles of Operation

4-1 Introduction

This section contains a functional description of the G3L-1929-120 Multi-Carrier Power Amplifier

(MCPA).

4-2 RF Input Signal

The maximum input power for all carrier frequencies to the amplifier should not exceed the limits

specified in the appendix A specifications.

4-3 RF Output Load

The load impedance should be as good as possible (VSWR of 1.5:1 or better) in the working

band for good power transfer to the load. If the amplifier is operated into a filter, it will maintain its

distortion characteristics outside the signal band even if the VSWR is infinite, provided the re-

flected power does not exceed one watt. A parasitic signal of less than one-watt incident on the

output will not cause distortion at a higher level than the normal forward distortion (i.e. –65 dBc).

4-4 Multi-Carrier Power Amplifier (MCPA) Functional Description

The MCPA is a linear, feed-forward multi-carrier power amplifier that operates in the 60 MHz fre-

quency band from 1930 MHz to 1990 MHz (refer to table 1-4 for amplifier specifications). The

amplifier provides a gain of 60 dB to provide a typical output of 70 watts (48.8 dBm). Refer to fig-

ure 4-1 for the amplifier functional block diagram. Each amplifier is a self-contained module and

is functionally independent of any other MCPA in a system. The amplifiers are designed for paral-

lel operation to achieve high peak power output. Each MCPA has an alarm board that monitors

the amplifier performance. If a failure or fault occurs in an MCPA, it is transmitted to a subrack

system via the D-subminiature 21WA4 connector at the rear of the module. The subrack reports

all alarms to the host system.

Continuously comparing active paths with passive references, and correcting for small variations

through RF feedback controls maintain constant gain. All gain variations, for example those due

to temperature, are reduced to the passive reference variations. The amplifier consists of the fol-

lowing major functions:

• Preamplifier

• Main amplifier

• Error amplifier

• Alarm monitoring and control

• First and second loop control circuits

• Pilot tone generator

044-05138 Rev. A 4-1 May 2003

G3L-1929- Installation and Service Manual

Figure 4-1 Multi-Carrier Power Amplifier Functional Block Diagram

4-4.1 Preamplifier

The carrier is applied to the input port of the amplifier. This signal is fed to the preamplifier stage

where it is amplified using two stages of class A mode amplifiers. The output of the preamplifier is

then split into two paths, one to the main amplifier and one to the error amplifier.

4-4.2 Main and Error Amplifiers

The main amplifier provides approximately 14.5 dB of gain in the 1930 to 1990 MHz frequency

band (refer to table 1-2 for amplifier specifications). The main amplifier employs class AB amplifi-

cation for maximum efficiency. The error amplifier and feed forward loops are used to correct sig-

nal non-linearity’s introduced by the class AB main amplifier. The error amplifier operates in class

A mode. The RF signal from the preamp is coupled to an attenuator and phase shifter in the first

feed-forward loop where it is phase shifted by 180 degrees and amplified in the premain ampli-

fier. The output from the premain amplifier is fed to the class AB main amplifier. The signal output

from the main amplifier is sampled using a coupler, and the sample signal is combined with the

main input signal and input to the second feed-forward loop.

The error signal is attenuated, phase shifted 180 degrees, then fed to the error amplifier where it

is amplified to a level identical to the sample output from the main amplifier. The output from the

error amplifier is then coupled back and added to the output from the main amplifier. The control

loops continuously make adjustments to cancel out any distortion in the final output signals.

044-05138 Rev. A 4-2 May 2003

G3L-1929- Installation and Service Manual

4-4.3 Alarm Monitoring and Control

The alarm logic controls the +5 Vdc bias voltage that shuts down the amplifier. During routine op-

eration, all normal variations are automatically compensated for by the feed-forward loop control.

However, when large variations occur beyond the adjustment range of the loop control, a loop

fault occurs. When this happens, an alarm indicator is illuminated on the front panel of the

subrack. The fault is transmitted back to an external summary module via the external alarm in-

terface connection on the front panel of the subrack.

4-4.4 First and Second Loop Control Circuits

The primary function of the first loop is to provide an error signal for the second loop. The primary

function of the second loop is to amplify the error signal to cancel out spurious products devel-

oped in the main amplifier. The input signal is amplified by a preamplifier and fed to a coupler and

delay line. The signal from the coupler is fed to the attenuator and phase shifter in the first loop.

The first loop control section phase shifts the main input signals by 180 degrees and constantly

monitors the output for correct phase and gain.

The second loop control section obtains a sample of the distortion added to the output signals by

the main amplifiers. The signal is phase shifted 180 degrees, then fed to the error amplifier where

it is amplified to the same power level as the input sample. The signal is then coupled to the error

signal of the main amplifier output. The final output is monitored by the second loop and adjusted

to ensure that the signal distortion and intermodulation distortion (IMD) on the final output is can-

celled out.

4-4.5 Pilot Tone Generator

The basic idea of injecting a pilot tone is that if the pilot signal is suppressed, then the distortion

from the main amplifier is also suppressed. To accomplish this, the pilot tone generator signal is

injected into the first loop and then detected at the feedforward output using the original pilot tone

as a reference. The information is then fed back to control the gain and phase such that the out-

put distortion is minimized.

4-5 Amplifier Module Cooling

The amplifier is cooled by forced air flowing over its heat sink, which is provided by two fans

mounted on the front of the subrack. The fans draw air through the front of the system and ex-

haust hot air out the back. The fans are field replaceable. Each amplifier, when properly cooled,

maintains the amplifier within the specified operating temperature range. Six inches of free space

are required at both the front and rear panels of the subrack to allow adequate air volume to cir-

culate over the heat sinks.

4-6 Power Distribution

Primary DC power for the amplifier is provided by the host system. The amplifier module has a

DC/DC converter and voltage regulator that converts the +27 Vdc to +15 Vdc, +5 Vdc, and -5 Vdc

for internal use.

044-05138 Rev. A 4-3 May 2003

G3L-1929- Installation and Service Manual

Section 5. Maintenance

5-1 Introduction

This section contains periodic maintenance and performance test procedures for the G3L-1929-

120 Multi-Carrier Power Amplifier (MCPA).

NOTE

Check your sales order and equipment warranty before attempting to service or re-

pair the unit. Do not break the seals on equipment under warranty or the warranty will

be null and void. Do not return equipment for warranty or repair service until proper

shipping instructions are received from the factory.

5-2 Periodic Maintenance

Periodic maintenance requirements and the intervals at which the tasks should be performed are

listed in table 5-1.

Table 5-1 Periodic Maintenance

Task Interval Action

Inspection:

Cables and Connectors

12 Months Inspect signal and power cables for frayed insulation.

Check RF connectors to ensure that they are tight.

Performance Tests 12 Months Perform annual test per paragraph 5-4.

Clean Fans/Heat Sinks 3 Months Inspect for debris. Remove dust with a soft cloth/brush

or vacuum cleaner.

5-3 Test Equipment Required For Test

Test equipment required to test the amplifier is listed in table 5-2. Equivalent test equipment may

be substituted for any item, keeping in mind that a thermistor type power meter is required.

NOTE

All RF test equipment required must be calibrated to 0.05 dB resolution. Any devia-

tion from the nominal attenuation must be accounted for and factored into all

output readings.

Table 5-2 Test Equipment Required

Nomenclature Manufacturer Model

Signal Generator H.P. 8656B

20 dB Attenuator, 250 Watt Bird Tenuline

20 dB Attenuator, 20 Watt (2 each) Bird Tenuline

Spectrum Analyzer H.P. 8560E

Coax Directional Coupler H.P. 778D

Power Meter / Sensor H.P. 437B / 8481A

Arbitrary Waveform Generator Sony AWG2021

Network Analyzer H.P. 8753C

044-05138 Rev. A 5-1 May 2003

G3L-1929- Installation and Service Manual

5-4 Performance Test

Performance testing should be conducted every 12 months to ensure that the amplifier system

meets the operational specifications listed in Table 5-3. Also verify system performance after any

amplifier module is replaced in the field. The test equipment required to perform the testing is

listed in table 5-2, and the test setup is shown in figure 5-1.

NOTE

The frequencies used in this test are typical for an amplifier with a 60 MHz band from

1930 MHz to 1990 MHz. Select evenly spaced F1, F2, F3, and F4 frequencies that cover

the instantaneous bandwidth of your system.

5-4.1 Amplifier Performance Test

To perform these tests, proceed as follows:

Connect test equipment as shown in figure 5-1.

WARNING

Do not apply any RF signals at this time.

5-4.1.1 Amplifier Spurious Emissions Test:

With the RF input signal to the amplifier set to be as shown in Figure 5-1, use the spectrum ana-

lyzer to measure the spurious emissions performance. Record test data in Table 5-3. Verify that it

is within the specifications shown in table 1-2. Switch tested amplifier to OFF.

5-4.1.2 Gain Test:

1. Disconnect spectrum analyzer from test setup, and connect the network analyzer.

2. Set network analyzer as follows:

A. Power output to -10 dBm max.

B. Frequency start to 1930 MHz.

C. Frequency stop to 1990 MHz.

D. Normalize the network analyzer for gain and return loss.

3. Check the amplifier gain across the band from 1930 MHz to 1990 MHz. Gain should be as

specified in table 1-1. Record test data in table 5-3.

5-4.1.3 Input Return Loss:

Read and record the S11 return loss measurement on network analyzer. Record test data in table

5-3.

044-05138 Rev. A 5-2 May 2003

G3L-1929- Installation and Service Manual

Figure 5-1 Amplifier Test Setup Diagram

Table 5-3 G3L-1929-120 Amplifier Test Data Sheet

DATE _________________________________ MODULE S/N _________________________

Test Conditions:

Load and Source Impedance: 50 Ohms

VSWR: < 1.5:1

Supply Voltage: +27 Vdc ±0.1 Vdc

Test Specification Min Max Data

RF Gain

Vcc = 27 Vdc

PO = See table 1-4

Freq. = 1930 – 1990 MHz

57.0 dB 58.0 dB

Spurious

Emissions

Vcc = 27 Vdc

PO = See table 1-4

1930 – 1990 MHz Band

-65 dBc

Gain Flatness Vcc = 27 Vdc

PO = See table 1-4

1930 – 1990 MHz Band

±0.5 dB

Input Return

Loss

Vcc = 27 Vdc

PO = See table 1-4

1930 – 1990 MHz Band

-14 dB

PASS FAIL

Tested by

044-05138 Rev. A 5-3 May 2003

G3L-1929- Installation and Service Manual

5-5 Field Replacement of the Module

The GL3-1929-120 multi-carrier power amplifier module can be replaced in the field on site by a

qualified technician with experience maintaining RF power amplifiers and similar equipment:

To replace a power amplifier module, proceed as follows:

1. Set On/Off switch on the front panel of the amplifier module to Off (down).

2. Loosen the two thumbscrews that secure amplifier module to the subrack.

CAUTION

When removing the amplifier from the subrack, it is very important to support the am-

plifier such that the rear of the module does not suddenly drop when the guide rail

disengages from the track. A drop such as this could damage the rear 21WA4 multipin

connector.

3. With steady even pressure, use handle on front of amplifier to pull module out of subrack.

4. Install replacement in reverse order of steps 1 through 3 above.

044-05138 Rev. A 5-4 May 2003

G3L-1929- Installation and Service Manual

Section 6. Troubleshooting

6-1 Introduction

This section contains a list of problems that could occur and a few suggested actions that can

correct the problem. If the suggested corrective action does not eliminate the problem, please

contact your Powerwave field representative or the factory for further instructions (refer to para-

graph 6-3).

NOTE

Check your sales order and equipment warranty before attempting to service or re-

pair the unit. Do not break the seals on equipment under warranty or the warranty will

be null and void. Do not return equipment for warranty or repair service until proper

shipping instructions are received from the factory.

6-2 Troubleshooting

Refer to table 6-1 for troubleshooting suggestions.

Table 6-1. Troubleshooting.

Problem Suggested Action

G3L-1929-120 Inoperative

1. Set On/Off/Reset toggle switch momentarily to Reset.

2. Check for proper power supply voltage.

3. Verify all RF connections.

4. Verify that unit does not have a major fault (red LED on

front panel of subrack).

5. Contact your field representative or factory.

6-3 Return For Service Procedures

When returning products to Powerwave, the following procedures will ensure optimum response.

6-3.1 Obtaining An RMA

A Return Material Authorization (RMA) number must be obtained prior to returning equipment to

the factory for service. Please contact our Repair Department at (714) 466-1000 to obtain this

number, or FAX your request to (714) 466-5800. Failure to obtain this RMA number may result in

delays in receiving repair service.

6-3.2 Repackaging For Shipment

To ensure safe shipment of the amplifier, it is recommended that the original package designed

for shipping the amplifier be reused. If it is not available, contact Powerwave’s Customer Service

Department for packing materials.

044-05138 Rev. A 6-1 May 2003

Powerwave Technologies 5JS0068 Power Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc Power Amplifier I GENERAL DESCRIPTION

Users Manual

Navigation menu

Namespaces

Views

Navigation