Powerwave Technologies 5JS0061 Amplifier User Manual PAF 0850 001

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5JS0061 User Manual HTML Version

Manual

869-894 MHz

Model NTGS86AB

Single-Channel Power Amplifier

Installation & Service

Manual

044-05126 Rev. A October 2002

NTGS86AB Installation & Service Manual

October 2002

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 East St. Andrew Place (888) 797-9283

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

Web Site: www.powerwave.com

044-05126 Rev. A ii October 2002

NTGS86AB Installation & Service Manual

Table Of Contents

Paragraph 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

1-4 Equipment Changes ....................................................................................................................................... 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

2-8 Molex 18-Pin Power, Alarms, & Controls Connector.............................................................................. 2-3

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 Input Amplifier and Pre-Distortion Amplifier........................................................................................... 4-1

4-4.2 Driver Amplifier .............................................................................................................................................. 4-1

4-4.2 Main Amplifier ................................................................................................................................................ 4-2

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

4-6 Power Distribution......................................................................................................................................... 4-3

Section 5

Maintenance

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

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

5-3 Amplifier Module Field Replacement ....................................................................................................... 5-1

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

044-05126 Rev. A October 2002

iii

NTGS86AB Installation & Service Manual

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

List Of Illustrations

Figure Page

No. No.

1-1 NTGS86AB Amplifier Isometric View......................................................................................................... 1-3

1-2 NTGS86AB Amplifier Top and Side Views ................................................................................................ 1-3

2-1 NTGS86AB Amplifier Front and Side Connectors .................................................................................... 2-2

2-2 Molex 18-Pin Power, Alarms, and Controls Connector ..........................................................................2-3

4-1 NTGS86AB Single-Channel Power Amplifier Block Diagram............................................................... 4-2

List Of Tables

Table Page

No. No.

1-1 NTGS86AB Single-Channel Power Amplifier Functional Specifications ........................................... 1-2

2-1 Molex 18-Pin Power, Alarms, and Controls Connector Signal Descriptions..................................... 2-3

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

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

044-05126 Rev. A October 2002

NTGS86AB Installation & Service Manual

Section 1 General Description

1-1 Introduction

This manual contains information and procedures for installation, operation, and maintenance of

Powerwave’s model NTGS86AB Single-Channel Power Amplifier (SCPA) module. 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 NTGS86AB amplifier module is a CDMA signal source, linear, single-channel power ampli-

fier (SCPA) module that operates in the 25 MHz frequency band from 869 MHz to 894 MHz. The

amplifier output is typically 25 watts with a gain range between 41 and 45 dB. The amplifier is de-

signed to be mounted in an enclosure with EMI containment. Its flat base plate allows for mount-

ing on a flat thermal-absorbing surface to provide adequate heat dissipation.

As shown in figure 1-1, each amplifier module has an RF input, RF output, and RF sample con-

nectors, as well as an 18-pin power, alarm, and control interface connector that allows the host

system to provide power and monitor the amplifier module performance. Primary power for the

amplifier is +26 Vdc.

Physical dimensions of the amplifier module are shown in figure 1-2.

1-3 Functional & Physical Specifications

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

1-4 Equipment Changes

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

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

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

044-05126 Rev. A 1-1 October 2002

NTGS86AB Installation & Service Manual

Table 1-1 NTGS86AB Single Channel Power Amplifier Functional Specifications

Frequency Range 869 - 894 MHz (25 MHz Bandwidth)

Maximum Average Input Power 13 dBm without damage; 0 dBm typical @ rated Pout

Continuous Average Output Power 25 Watts (44 dBm)

Frequency Offset Requirement Meas. Bandwidth

750 kHz -46 dBc 30 kHz

1.5 MHz -14dBm 37.5 kHz

1.98 MHz -61 dBc 30 kHz

4 MHz -14 dBm 100 kHz

Spurious Emissions @ Maximum

Rated Output Power

(25 W/44 dBm)

Outside Tx Band -14 dBm 30 kHz

Maximum RF Gain 45 dB

Gain Flatness ± 0.15 dB for any 2-MHz band within operating ranges.

Output Protection Mismatch Protected

Input Port Return Loss VSWR 2:1 Maximum

Out of Band Spurious Less than -13 dBm/30 kHz (see above)

DC Input Power +26 ± 0.5 Vdc, 260 mV p-p maximum ripple, ≤350 watts

6 Amps typical, 13 Amps maximum

Operating Temperature Range -40 °C to +50 °C, Ambient

Operating Humidity 5% - 95% Relative Humidity (Non-condensing)

Storage Humidity 5% - 95% Relative Humidity (Non-condensing)

Interface Connectors:

RF Input SMA Female

RF Output SMA Female

RF Sample SMA Female

Power Supply, alarm, and Control

Interface

18-Pin, Molex, Female

Test 4-Pin

Weight 8 lbs

Dimensions (inches) 7.865 (W) x 10.275 (D) x 1.55 (H)

*The base station reports the center frequency of the desired operating band to the amplifier and

the amplifier adjusts the bandwidth window accordingly, between the upper and lower limits of

the frequency range.

044-05126 Rev. A 1-2 October 2002

NTGS86AB Installation & Service Manual

Power, Alarm

and Control

Interface

Output

Sample

Test

(RS485)

Figure 1-1. NTGS86AB Amplifier Isometric View

Figure 1-2. NTGS86AB Amplifier Top and Side Views with Dimensions

044-05126 Rev. A 1-3 October 2002

NTGS86AB Installation & Service Manual

Section 2 Installation

2-1 Introduction

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

for the Model NTGA86AB Single-Channel Power Amplifier module. Carefully read all material in

this section prior to equipment unpacking or installation. Also read and review the operating pro-

cedures in section 3 prior to installing the equipment. It is important that the licensee perform

these tasks correctly and in good faith. If applicable, carefully read the appropriate parts of the

Federal Communications Commission (FCC) rules to determine how they apply to your installa-

tion. DON'T TAKE CHANCES WITH YOUR LICENSE.

2-2 Electrical Service Recommendations

Powerwave Technologies recommends that proper AC line conditioning and surge suppression

be provided on the primary AC input to the +26 Vdc power source. All electrical service should be

installed in accordance with the National Electrical Code, any applicable state or local codes, and

good engineering practice. Special consideration should be given to lightning protection of all

systems in view of the vulnerability of most transmitter sites to lightning. Lightning arrestors are

recommended in the service entrance. Straight, short ground runs are recommended. The elec-

trical 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 thermal type, capable of handling the maximum

anticipated inrush current, in a load center with a master switch.

2-3 Unpacking & Inspection

This equipment has been operated, tested and calibrated at the factory. Carefully open the con-

tainer(s) and remove the amplifier module(s). Retain all packing material that can be reassem-

bled in the event that the unit must be returned to the factory.

CAUTION

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

rough or careless handling.

Visually inspect the amplifier module for damage that may have occurred during shipment. Check

for evidence of water damage, bent or warped chassis, loose screws or nuts, or extraneous pack-

ing material in the connector. If the equipment is damaged, a claim should be filed with the carrier

once the extent of any damage is assessed. We cannot 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 necessary. If possible, inspect the equipment in the pres-

ence of the delivery person. If the equipment is damaged, the carrier is your first area of re-

course. If the equipment is damaged and must be returned to the factory, write or phone for a

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 CAR-

RIER'S PERFORMANCE

044-05126 Rev. A 2-1 October 2002

NTGS86AB Installation & Service Manual

2-4 Installation Instructions (Refer to figure 1-1)

The NTGS86AB amplifier module is designed for installation on a heatsink that permits access to

the module for connection of the RF cables and to the 18-pin power, alarms, and control connec-

tor.

To install the amplifier proceed as follows:

Power, alarms, and

control interface

RF interface

Front

Figure 2-1 NTGS86AB Amplifier Front and Side Connectors

True RMS

coupler output

Side Test

connector

1. Install amplifier on heatsink with thermally conductive material inserted between amplifier

module and heatsink, and secure in place with appropriate mounting screws. See figure 1-2.

2. Connect the antenna cable to RF OUTPUT female SMA connector.

3. Connect the transceiver output cable to RF INPUT female SMA connector.

WARNING

Turn external primary DC power off before connecting any cables.

4. Connect power, alarm, and control cable to matching 18-pin Molex connector located on the

front of the amplifier as shown in figure 2-1. Refer to figure 2-2 and table 2-1 for the 18-pin

Molex connector pin orientation and a list of related signal definitions.

5. Connect to the RF SAMPLE output.

6. Check your work before applying DC voltage to the system. Make certain all connections are

tight and correct.

7. Measure primary DC input voltage for +26 ±0.5 Vdc. If the DC input voltage is above or be-

low the limits, call and consult Powerwave before you turn on your amplifier system.

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

044-05126 Rev. A 2-2 October 2002

NTGS86AB Installation & Service Manual

2-5 Molex 18-Pin Power, Alarms, and Controls Connector

The power, alarms, and controls connections for the amplifier are made through the 18-pin Molex

connector shown in figure 2-2. The signals for each connector pin are listed and described in ta-

ble 2-1.

View looking into front of amplifier

Pin 18 Pin 10

Pin 9 Pin 1

Figure 2-2 Molex 18-Pin Power, Alarms, and Controls Connector

Table 2-1 Molex 18-Pin Power, Alarms, and Controls Connector Signal Descriptions

Pin Signal Description

1 TEMP_OUT 0-4.7 V temperature output

2 REV_PWR 0-4.7 V Reverse power detection

3 FWR_PWR 0-4.7 V forward power detection

4 GND GND

5 N/C N/C

6 ANX(-) - Anxiety output (RS-422 level)

7 GND GND

8 GND GND

9 GND GND

10 ANX(+) + Anxiety output (RS-422 level)

11 ENABLE(+) + Enable input (RS-422 level)

12 ENABLE(-) - Enable input (RS-422 level)

13 ALARM(+) + Alarm output (RS-422 level)

14 ALARM(-) - Alarm output (RS-422 level)

15 VDD +26 VDC

16 VDD +26 VDC

17 VDD +26 VDC

18 VDD +26 VDC

044-05126 Rev. A 2-3 October 2002

NTGS86ABInstallation & Service Manual

Section 3 Operating Instructions

3-1 Introduction

This section contains operating instructions for the NTGS86AB Single-Carrier Cellular Power

Amplifier module.

3-2 Initial Start-Up & Operating Procedures

There are no operating controls or indicators on the NTGS86AB amplifier module. To perform the

initial start-up, proceed as follows:

1. Verify that all input and output cables are properly connected per section 2.

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

amplifier.

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 supply that provides +26 Vdc to the amplifier system.

3. Turn on external exciter/transceiver and apply RF input signals.

044-05126 Rev. A 3-1 October 2002

NTGS86AB Installation & Service Manual

Section 4 Principles of Operation

4-1 Introduction

This section contains a functional description of the NTGS86AB Single-Carrier Cellular Power

Amplifier module.

4-2 RF Input Signal

The maximum input power should not exceed the limits specified in table 1-1.

4-3 RF Output Load

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

power transfer to the load.

4-4 Amplifier Functional Description

The NTGS86AB amplifier (figures 1-1 and 4-1) is a linear, single-channel power amplifier that

operates in the 25 MHz frequency band from 869 MHz to 894. The amplifier produces a typical

output power of 25 watts (44 dBm). Each amplifier in a system is a self-contained module and is

functionally independent of any other amplifier modules. Each amplifier module has alarms that

monitor the amplifiers performance. If a failure or fault occurs in an amplifier module, it is trans-

mitted to the host system via an RS-422 interface.

The amplifier is compliant to the requirements of FCC Part 24 with respect to spurious emissions

(see table 1-1). Constant gain is maintained by continuously comparing active paths with passive

references, and correcting for small variations through the RF feedback controls. All gain varia-

tions, for example those due to temperature, are reduced to the passive reference variations. The

amplifier module is comprised of:

• Input amplifier

• Pre-distortion amplifier

• Driver amplifier

• Main amplifier

• Isolator

4-4.1 Input Amplifier and Predistortion Amplifier

RF is fed to the input amplifier then to the predistortion amplifier where the input signal is dis-

torted such that it linearizes the output of the main amplifier. All the predistortion voltages and

loop voltages are controlled by a microprocessor.

4-4.2 Driver Amplifier

The driver amplifier is a class AB amplifier. The amplifier operates on +26 Vdc with bias voltage

controlled by the microprocessor.

044-05126 Rev. A 4-1 October 2002

NTGS86AB Installation & Service Manual

4-4.3 Main Amplifier

The main amplifier is a class AB amplification stage for maximum efficiency. The RF output signal

from the main amplifier is then applied to an isolator. The amplifier power performance is moni-

tored by the microprocessor via the forward and reverse detectors. The final output power is typi-

cally 44 dBm. The amplifier operates on +26 Vdc with gate bias voltages controlled by the micro-

processor.

Figure 4-1 NTGS86AB Single-Channel Power Amplifier Functional Block Diagram

4-5 Amplifier Module Cooling

Each amplifier module is contained within a thermally conductive chassis which, when properly

mounted on an adequate thermal surface, will provide sufficient cooling to maintain the amplifier

within the specified operating temperature range.

4-6 Power Distribution

Primary DC power for the amplifier is provided by the host system. The amplifier generates all the

required voltages internally from the main source.

044-05126 Rev. A 4-2 October 2002

NTGS86AB Installation & Service Manual

Section 5 Maintenance

5-1 Introduction

This section contains periodic maintenance and performance test procedures for NTGS86AB

Single-Carrier Cellular Power Amplifier module.

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 are listed in table 5-1. Table 5-1 also lists the intervals at

which the tasks should be performed.

Table 5-1 Periodic Maintenance

Task Interval Action

Inspection:

Cables and Connectors 12 Months Inspect signal and power cables for frayed insula-

tion. Check RF connectors to ensure they are tight.

Performance Tests No periodic maintenance is necessary beyond that

recommended by the base station manufacturer.

5-3 Amplifier Module Field Replacement

The NTGS86AB power amplifier module can be replaced in the field on site by a qualified techni-

cian with adequate ESD protection and experience maintaining RF power amplifiers and similar

equipment.

To replace a power amplifier module, proceed as follows:

1. Turn off the +26 Vdc power source to that specific amplifier module.

2. Disconnect the RF INPUT, RF OUTPUT, RF SAMPLE, and 18-pin Molex connectors.

3. Remove seven (7) screws that secure the amplifier module to the heat sink.

4. Carefully remove the amplifier module from the heat sink.

5. Remove any remaining Thermstrate from the heat sink. Use alcohol or other recommended

cleaning agent to achieve a clean heat sink mounting surface.

NOTE

Failure to completely remove old thermal grease, or the introduction of too much ther-

mal grease will dramatically alter the thermal transfer process between the amplifier

module and the heatsink.

6. Add Thermstrate thermal interface pad to surface of replacement amplifier, that mates with

heatsink. Use just enough Thermstrate to be evenly visible on the mounting surface.

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

044-05126 Rev. A 5-1 October 2002

NTGS86AB Installation & Service Manual

Section 6 Troubleshooting

6-1 Introduction

This section contains a list of problems and a few suggested actions that may correct the prob-

lem. If the suggested corrective action does not eliminate the problem, please contact your

Powerwave field representative or the factory for further instructions.

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

Table 6-1 lists general guidelines established to aid Field Engineers or Cell Site Technicians in

the proper method of Powerwave equipment fault resolution by fault mode.

Table 6-1 Troubleshooting

Symptom Suggested Action

SCPA Inoperative Check for proper power supply voltage.

SCPA Not Enabled Verify ENABLE(+) line is high.

Alarm Output is (RS-422) High Verify input RF is within specified power and frequency limits

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 (888) 797-9283 or (714) 466-

1000 to obtain this number, or FAX your request to (714) 466-5816. 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 package designed for the

amplifier be used. The original packaging material is reusable. If it is not available, contact

Powerwave’s Customer Service Department for packing materials and information.

044-05126 Rev. A 6-1 October 2002

Powerwave Technologies 5JS0061 Amplifier User Manual PAF 0850 001

Powerwave Technologies Inc Amplifier PAF 0850 001

Manual

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