Powerwave Technologies 5JS0067 W-CDMA Multi-Channel PCS Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc W-CDMA Multi-Channel PCS Amplifier I GENERAL DESCRIPTION

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1930-1990 MHz

Installation & Service

Manual

Model NTUM30DA

Multi-Channel PCS Amplifier

044-05141 Rev. A June 2003

NTUM30DA Installation & Service Manual

June 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 East St. Andrew Place (888) 797-9283

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

Web Site: www.powerwave.com

044-05141 Rev. A ii June 2003

NTUM30DA Installation & Service Manual

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 Power In Connector ....................................................................................................................................... 2-2

2-6 Data I/O Connector......................................................................................................................................... 2-3

2-7 P3: Differential IIC Clock, Receive, & Transmit Connector................................................................... 2-4

2-8 P4: IIC, Power, Alarms, & Controls Connector......................................................................................... 2-4

2-9 P5: IIC, RS485, Power, & Other Signals Connector ................................................................................. 2-6

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

4-4.2 1st Loop Phase & Gain.................................................................................................................................... 4-1

4-4.3 Driver Amplifier .............................................................................................................................................. 4-2

4-4.4 Main Amplifier ................................................................................................................................................ 4-2

4-4.5 Multifunction Board....................................................................................................................................... 4-2

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

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

4-7 Amplifier Alarms............................................................................................................................................. 4-3

4-7.1 Minor Alarms................................................................................................................................................... 4-3

4-7.1.1 Main Loop Cancellation Alarm (1st Loop Alarm) ...................................................................................... 4-3

4-7.1.2 Error Loop Cancellation Alarm (2nd Loop Alarm)...................................................................................... 4-4

4-7.1.3 Gain Alarm ....................................................................................................................................................... 4-4

4-7.1.4 Partial Failure of Main Amplifier Alarm (Transistor/Device Fail) ........................................................4-4

4-7.1.5 Over Temperature Warning Alarm.............................................................................................................. 4-4

4-7.1.6 Power Supply Warning Alarm ..................................................................................................................... 4-4

4-7.1.7 High DC Power Consumption Warning Alarm.......................................................................................... 4-4

4-7.2 Major Alarms................................................................................................................................................... 4-5

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NTUM30DA Installation & Service Manual

Par. Section 4 Page

No. Principles of Operation (continued) No.

4-7.2.1 Over Temperature Shutdown Alarm........................................................................................................... 4-5

4-7.2.2 Power Supply Shutdown Alarm .................................................................................................................. 4-5

4-7.2.3 High DC Power Consumption Shutdown Alarm ....................................................................................... 4-6

Section 5

Maintenance

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

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

5-3 Field Replacement Of The Module.............................................................................................................. 5-1

Section 6

Troubleshooting

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

6-2 Trouble shooting............................................................................................................................................. 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 NTUM30DA Amplifier .................................................................................................................................... 1-1

1-2 NTUM30DA Amplifier Bottom View............................................................................................................ 1-3

1-3 NTUM30DA Amplifier Side View ................................................................................................................ 1-3

1-4 NTUM30DA Amplifier Front Panel .............................................................................................................. 1-4

2-1 NTUM30DA Amplifier Front Panel .............................................................................................................. 2-2

2-2 Power In Connector ....................................................................................................................................... 2-2

2-3 Data I/O Connector......................................................................................................................................... 2-3

4-1 NTUM30DA Amplifier Block Diagram........................................................................................................ 4-2

4-2 Minor Alarm Reporting Sequence .............................................................................................................. 4-3

4-3 Major Alarm Reporting Sequence .............................................................................................................. 4-5

List Of Tables

Table Page

No. No.

1-1 NTUM30DA Multichannel Power Amplifier Functional Specifications.............................................. 1-2

2-1 Power In Connector Definition .................................................................................................................... 2-2

2-2 Data I/O Connector Definition...................................................................................................................... 2-3

4-1 Alarm Summary .............................................................................................................................................. 4-6

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

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

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NTUM30DA Installation & Service Manual

Section 1 General Description Section 1 General Description

1-1 Introduction 1-1 Introduction

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

Powerwave’s model NTUM30DA multichannel power amplifier (MCPA). The manual is organized

into six sections as follows:

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

Powerwave’s model NTUM30DA multichannel power amplifier (MCPA). 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

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 1-2 General Description

The NTUM30DA is a linear, multichannel power amplifier that operates with an instantaneous

bandwidth of 20 MHz (determined by the base station) in the 60 MHz frequency band from 1930

MHz to 1990 MHz. It provides either 30 watts (UMTS) or 45 watts of power, based on the select-

able operating mode. It provides for two RF inputs: a primary input and a redundant input.

The NTUM30DA is a linear, multichannel power amplifier that operates with an instantaneous

bandwidth of 20 MHz (determined by the base station) in the 60 MHz frequency band from 1930

MHz to 1990 MHz. It provides either 30 watts (UMTS) or 45 watts of power, based on the select-

able operating mode. It provides for two RF inputs: a primary input and a redundant input.

Each amplifier module has a power, and data I/O connector that allows the host system to moni-

tor the amplifier module performance. Primary power for the amplifier is -48 Vdc.

Each amplifier module has a power, and data I/O connector that allows the host system to moni-

tor the amplifier module performance. Primary power for the amplifier is -48 Vdc.

1-3 Functional & Physical Specifications 1-3 Functional & Physical Specifications

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

Figure 1-1. NTUM30DA Amplifier

All specifications are subject to change without notice. Contact the factory for complete performance data.

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NTUM30DA Installation & Service Manual

Table 1-1 NTUM30DA Multichannel Power Amplifier Functional Specifications

Frequency Range 1930-1990 MHz (60 MHz Bandwidth)

*Instantaneous Bandwidth 20 MHz

Input Power 1.4 dBm without damage (operating);

15 dBm without damage (non-operating)

Continuous Average Output Power 45 Watts (46.53 dBm) Mode 1

30 Watts (44.77 dBm) Mode 2

Frequency Offset

Fcl: lower frequency center of the emission block.

Fcu: upper frequency center of the emission block.

∆F = the frequency gap between the lower or the upper carrier of the

emission block and the center of the measurement filter (BW)

Max Level

dBm

Measurement

filter BW

Fcl- 2.780 MHz< ∆F ≤ Fcl- 2.515 MHz

Fcu+ 2.515 MHz≤ ∆F < Fcu+ 2.780 MHz - 16 30 kHz

Fcl- 3.515 MHz< ∆F ≤ Fcl- 2.780 MHz

Fcu+ 2.780 MHz≤ ∆F < Fcu+ 3.515 MHz [-16-15*(Fo-2.780)] 30 kHz

Fcl- 4.0 MHz< ∆F ≤ Fcl- 3.515 MHz

Fcu+ 3.515 MHz≤ ∆F < Fcu+ 4.0 MHz -27 30 kHz

Spurious

Emissions @

Maximum Rated

Output Power

Fcl- 12.5 MHz< ∆F ≤ Fcl- 4.0 MHz

Fcu+4.0 MHz≤ ∆F < Fcu+12.5 MHz -14 1 MHZ

RF Gain 46.5 ± 1 dB

Output Dynamic Range

Mode 1

Mode 2

21.5 dB

19.77 dB

Output Protection: Mismatch Protected

Input Port Return Loss: < 1.43:1 Max.

Frequency band Max Level (dBm) Measurement filter BW

9 kHz ↔ 150 kHz -39 dBm 1 kHz

150 kHz ↔ 30 MHz -39 dBm 10 kHz

30 MHz ↔ 1 GHz -39 dBm 100 kHz

1 GHz ↔ Fc1 - 60 MHz -33 dBm 1 MHz

Fcl - 60 MHz ↔ Fcl - 50 MHz -28 dBm 1 MHz

Fcl - 50 MHz ↔ Fcl – 12.5 MHz -16 dBm 1 MHz

Fcu + 12.5 MHz ↔ Fcu + 50 MHz -16 dBm 1 MHz

Fcu + 50 MHz ↔ Fcu + 60 MHz -28 dBm 1 MHz

Out of Band

Spurious:

Fcu + 60 MHz ↔ 12.75 GHz -33 dBm 1 MHZ

DC Input Power:

Normal voltage range:

Extended voltage range:

Abnormal voltage range:

Power Consumption:

Mode 1

Mode 2

Reverse polarity protected

-38 V to –58 V

-36 V to –38 V and -58 V to –60 V

0 V to –36 V and -60 V to –72 V

375 W max.

300 W max.

All specifications are subject to change without notice. Contact the factory for complete performance data.

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NTUM30DA Installation & Service Manual

Table 1-1 (Cont.) NTUM30DA Multichannel Power Amplifier Functional Specifications Table 1-1 (Cont.) NTUM30DA Multichannel Power Amplifier Functional Specifications

Operating Temperature: Operating Temperature: -15 ºC to +95 ºC (internal temperature sensor) -15 ºC to +95 ºC (internal temperature sensor)

Storage Temperature: -40 ºC to +85 ºC

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

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

Interface Connectors:

RF Input

RF Output

-48 Vdc Power and Ground

Alarms and Sensing

SMA Female

N Female

3W3 D-Sub

25-Pin D-Sub

Weight 22 lbs

Dimensions (inches): 12.82 (W) x 15.70 (D) x 2.94 (H)

*The base station reports the lowest carrier frequency and the activated RF carriers. The ampli-

fier then sets the pilot frequency accordingly.

All dimensions are in inches

And are for reference only Figure 1-2. NTUM30DA Amplifier Bottom View

Figure 1-3. NTUM30DA Amplifier Side View

All specifications are subject to change without notice. Contact the factory for complete performance data.

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NTUM30DA Installation & Service Manual

Figure 1-4. NTUM30DA Amplifier Front Panel

All specifications are subject to change without notice. Contact the factory for complete performance data.

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NTUM30DA Installation & Service Manual

Section 2 Installation

2-1 Introduction

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

for the Model NTUM30DA Multi Channel Power Amplifier. Carefully read all material in this sec-

tion prior to equipment unpacking or installation. Also read and review the operating procedures

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 Com-

munications Commission (FCC) rules to determine how they apply to your installation. 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 -48 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 extrane-

ous packing 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 impor-

tance 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

presence 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

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

The NTUM30DA amplifier module is designed for installation on a heatsink that permits access to

the module for connection of the RF cables and the power, alarm, and control connectors.

To install the amplifier proceed as follows:

Figure 2-1 NTUM30DA Amplifier, Front Panel View

1. Install the amplifier and secure in place with appropriate mounting screws. See figure 2-1.

2. Connect the antenna cable to TRANSMITTER female N-type connector.

3. Connect the transceiver output cables to the RF IN female SMA connectors.

WARNING

Turn the front panel Power switch off before connecting the power cable.

4. Connect the power, and data cables to matching Power In and Data I/O connectors. Refer

to paragraphs 2-5 and 2-6 following for appropriate port and pin connections.

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

are tight and correct.

6. Measure primary DC input voltage. DC input voltage should be -48 ±0.5 Vdc. If the DC in-

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

amplifier system.

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

2-5 Power In Connector

The -48 Vdc power and ground connections on the amplifier are made through a 3-pin female

D-Sub connector (figure 2-2) and are listed and described in table 2-1.

3 2 1

Figure 2-2 Power In Connector

Table 2-1 Power In Connector Definition

Pin Signal Description

1 -48 V -48 Vdc for MCPA

2 Chassis Gnd Chassis Ground

3 .-48V_RTN -48 Vdc return, grounded to MCPA chassis ground

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2-6 Data I/O Connector

The alarms and sensing connections on the amplifier are made through a 14-pin micro-fit con-

nector (figure 2-3) and are listed and described in table 2-2.

Figure 2-3 Data I/O Connector

Table 2-2 Data I/O Connector Definition

Pin Signal Description

1 Manuel control Control ON/OFF

2 GND Ground

3 PA-Enable-Actif + Control

4 PA-Enable-Actif - Control

5 PA_presence_reset Towards µcontroller

6 GND_presence_reset Ground

7 Reserved Reserved

8 GND Ground

9 Reserved Reserved

10 Reserved Reserved

11 GND Ground

12 Reserved Reserved

13 Reserved Reserved

14 UART TX+ (TRM to MCPA) Base Station Control and Alarm Signaling

15 UART TX- (TRM to MCPA) Base Station Control and Alarm Signaling

16 Reserved Reserved

17 UART RX+ (MCPA to TRM) Base Station Control and Alarm Signaling

18 UART RX- (MCPA to TRM) Base Station Control and Alarm Signaling

19 GND Ground

20 Reserved Reserved

21 Reserved Reserved

22 Reserved Reserved

23 Reserved Reserved

24 Reserved Reserved

25 Reserved Reserved

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NTUM30DA Installation & Service Manual

Section 3 Operating Instructions

3-1 Introduction

This section contains operating instructions for the Multicarrier Cellular Amplifier.

3-2 Initial Start-Up & Operating Procedures

There are no operating controls or indicators on the NTUM30DA 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 -48 Vdc to the amplifier system.

3. Turn the amplifier front panel switch to On. The amplifier will run through built-in-test for a

few seconds, and notify the BTS when the loops converge. The base station allows up to 30

seconds for this step to complete.

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

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NTUM30DA Installation & Service Manual

Section 4 Principles of Operation

4-1 Introduction

This section contains a functional description of the multichannel power amplifier (MCPA).

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 NTUM30DA amplifier (figures 1-1 and 4-1) is a linear, MCPA that operates in the 60 MHz

frequency band from 1930 MHz to 1990 MHz with an instantaneous bandwidth of 20 MHz. The

operating band is determined by the operating frequency selection(s) of the base station (refer to

table 1-1). The amplifier produces 45 watts of output power when operated in mode 1 or 30 watts

of output power when operated in mode 2. Each amplifier is a self-contained module and is func-

tionally independent of any other amplifier module(s) in the system. Each amplifier module has

an alarm board that monitors the amplifier performance. If a failure or fault occurs in an amplifier

module, it is transmitted to the host system via an RS-485 interface.

The amplifier is compliant to the requirements of FCC rules 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:

An input amplifier

1st Loop Phase & Gain

A driver amplifier

A main amplifier

A multifunction board

4-4.1 Input Amplifier

RF is fed to the input amplifier, which consists of an isolator at the input, bandpass filter, voltage

variable attenuators (VVA), and phase shifters for gain control and phase sweeping functions.

The circuits in this section of the amplifier are controlled by a microprocessor on the Multifunction

board. At its output, the input amplifier splits the signal to the 1st Loop Phase and Gain circuit, and

the carrier cancellation circuit.

4-4.2 1st Loop Phase & Gain

The 1st Loop Phase & Gain circuit is a predistortion amplifier. The input signal is predistorted

such that it linearizes the output of the main amp at the rated output power of the MCPA. It also

contains the main loop VVAs and phase shifters. All the predistortion voltages and loop voltages

are controlled by a microprocessor.

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NTUM30DA Installation & Service Manual

4-4.3 Driver Amplifier

The driver amplifier consists of two stages of class AB amplification, which provide the approxi-

mately 40% of the gain in the 60 MHz frequency band from 1930 MHz to 1990 MHz.

4-4.4 Main Amplifier

The main amplifier employs two class AB amplification stages for maximum efficiency. It provides

approximately 40% of the gain in the 60 MHz frequency band. The output from the main amplifier

is typically higher than the rated output power of the MCPA, to allow for losses associated with

the components in the remaining RF path. The RF signals are then applied to a delay line and

directional coupler, where the distortion products are cancelled out and the amplifier power per-

formance is monitored.

4-4.5 Multifunction Board

The multifunction board consists of feed forward loop control and alarm circuits. The MCPA com-

municates to the host system through the multifunction board, which gathers the status informa-

tion of the amplifier and reports to the host system via the RS-485 interface when instructed. It

also protects the MCPA from adverse conditions such as overpower, input overdrive, over-

voltage, etc. A microprocessor on the multifunction board also controls two loops in the feed-

forward system.

Pre

Amp

Driver Main

Amp

Error

Amp

Delay

Feed Forward Loop control

2nd Loop

Phase & Gain

1st Loop

Phase & Gain Delay

Alarms & Display

+15 +5 -5

Power Supply

-30dB -10dB

-40dB

RF Out

RFL

PWR

FWD

PWR

Front Panel

Smart Rack

+27VDC

Figure 4-1 NTUM30DA Multichannel Power Amplifier Functional Block Diagram

4-5 Amplifier Module Cooling

Each amplifier module is contained within a thermally conductive chassis and properly mounted

on an adequate thermal surface, which provides sufficient cooling when forced air is circulated

over the heat sink fins to maintain the amplifier within the specified operating temperature range.

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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.

4-7 Amplifier Alarms

4-7.1 Minor Alarms

When a minor alarm condition occurs, the alarm is latched into a minor alarm condition. The am-

plifier alarm state is read by the BTS the next time the amplifier is poled by the BTS. After the

alarm status is sent the minor alarm register is cleared, unless the alarm condition still exists. If

the amplifier receives a “Enable Command” or “Clear Alarms Command”, all minor alarms will be

cleared. If the amplifier is disabled, all minor alarms are also cleared.

Minor alarms do not directly affect amplifier functionality.

BTS MCPA

OPERATIONAL

Read Power and Status response - Alarm reported

Minor Alarm condition

appears

Minor Alarm condition

disappears

Read Power and Status command

Minor Alarm condition

still exists

Read Power and Status command

Read Power and Status response - Alarm reported

Read Power and Status command

Read Power and Status response - No Alarm reported

Figure 4-2 Minor Alarm Reporting Sequence

4-7.1.1 Main Loop Cancellation Alarm (1st Loop Alarm)

During normal operation, if the 1st Loop is not locked for 30 seconds a Main Loop Cancellation

Alarm is declared. During power-up, the BTS waits for 30 seconds to allow the 1st Loop to lock.

When the main amplifier is first turned on, the Main Loop Cancellation Alarm ON is on until the

loops converge. The BTS allows 30 seconds for the alarm to clear after putting the amplifier into

Operational mode before reporting the alarm.

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4-7.1.2 Error Loop Cancellation Alarm (2nd Loop Alarm)

During normal operation, if the 2nd Loop is not locked for 30 seconds a Error Loop Cancellation

Alarm is declared. During power-up, the BTS waits for 30 seconds to allow the 2nd Loop to lock.

When the error amplifier is first turned on, the Error Loop Cancellation Alarm ON status is on until

the loops converge. The BTS allows 30 seconds for the alarm to clear after putting the amplifier

into Operational mode before reporting the alarm.

Detected loss of pilot signal with the error amplifier on, also leads to an Error Loop Cancellation

Alarm.

4-7.1.3 Gain Alarm

The gain alarm is caused by either of the following conditions:

• No output power with a nominal input power.

(Pin > -3.8 dBm and Pout < 25 dBm for five seconds.

• Pin > +2.5 dB for five seconds.

4-7.1.4 Partial Failure of Main Amplifier Alarm (Transistor/Device Fail)

A sensor detects a main or error amplifier transistor failure. A transistor failure is detected as fol-

lows:

• When the main and error amplifiers are first turned on and converged, the Main VVA and Er-

ror VVA convergence points are compared to the Default Main VVA and Default Error VVA

values (with temperature compensation). If either of the VVAs is significantly lower than its

default value, the Partial Failure of Main Amplifier alarm is set.

• After the above test is performed, the Main VVA and Error VVA are continually monitored. If

the Main VVA or Error VVA significantly drop then the Partial Failure of Main Amplifier alarm

is set.

4-7.1.5 Over Temperature Warning Alarm

The MCPA will alarm if the temperature exceeds the normal operation temperature threshold

(90ºC internal temperature sensor) for five seconds. This threshold is a few degrees below the

Over Temperature Shutdown Alarm.

4-7.1.6 Power Supply Warning Alarm

The MCPA monitors the non-converter voltages, 15V, 5V and -5V power supply voltages and

alarms when of any of these DC voltages fail for at least five seconds. The normal operating

range for these voltages is: 15V + 1.5V, 5V + 0.5V and –5V + 0.5.

4-7.1.7 High DC Power Consumption Warning Alarm

If input DC power exceeds 375W in Mode 1 or 300W in Mode 2, for five seconds, the High DC

Power Consumption Warning Alarm is set.

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NTUM30DA Installation & Service Manual

4-7.2 Major Alarms

When a major alarm condition occurs, the alarm is latched into a major alarm condition. The am-

plifier alarm state is read by the BTS the next time the amplifier is poled by the BTS. After the

alarm status is sent the major alarm register is not cleared. If the amplifier receives a “Enable

Command” or “Clear Alarms Command”, all major alarms will be cleared. If the amplifier is dis-

abled, all major alarms are also cleared.

Major alarms cause the amplifier to enter a STANDBY state, and the transceiver(s) associated

with the amplifier will be off-the-air. The error amplifier and main amplifier are turned off.

BTS MCPA

OPERATIONAL

Read Power and Status response - Alarm reported

Major Alarm condition

appears

Major Alarm condition

disappears

Read Power and Status command

Major Alarm condition

still exists

Read Power and Status command

Read Power and Status response - Alarm reported

Read Power and Status command

Read Power and Status response - Alarm reported

STANDBY

Figure 4-3 Major Alarm Reporting Sequence

4-7.2.1 Over Temperature Shutdown Alarm

The MCPA will alarm if the base plate temperature exceeds the temperature threshold at which

the MCPA can be damaged (95ºC) for five seconds. This condition does not auto-recover and will

require a reset command when the condition is corrected and the amplifier module has cooled

sufficiently.

4-7.2.2 Power Supply Shutdown Alarm

The MCPA monitors the converter power supply output voltages, 28V (23V in Mode 2) and 9V,

and sets the Power Supply Shutdown Alarm if a power supply converter fails for five seconds or

longer. The alarm is set under the following conditions and does not auto-recover:

• 28V > 30.8V or 28V < 24.8V in Mode 1 or 24V > 25.75V or 24V < 20.25V in Mode 2.

• 9V > 9.9V or 9V < 8.1V

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4-7.2.3 High DC Power Consumption Shutdown Alarm

If input power exceeds 417W in Mode 1 or 330W in Mode 2, for one second, the High DC Power

Consumption Shutdown Alarm is set.

Table 4-1 Alarm Summary

Alarm Definition Implementation Persistence

Time

Temperature Overload (Major) Temp Sensor Temperature > 90ºC 5 seconds

High Temperature (Minor) Temp Sensor Temperature > 85ºC 5 seconds

DC/DC Converter Shutdown

(Major)

9V or 28V (23V in Mode 2) more than 10%

out of tolerance

5 seconds

DC Voltage Regulation Failure

(Minor)

5V, -5V, +15V more than 10% out of toler-

ance

5 seconds

DC Power Consumption

Overload (Major)

Mode 1: Input DC power > 417W

Mode 2: Input DC power > 330W

1 second

High DC Power Consumption

(Minor)

Mode 1: Input DC power > 375W

Mode 2: Input DC power > 300W

5 seconds

Gain Control (Minor) 1. Input Power > +2.5 dB OR

2. Input Power > -3.8 dB AND Output

Power < 25 dBm

5 seconds (both)

Partial Failure of Main Ampli-

fier (Minor)

Main Amp or Error Amp transistor failure

detected.

---

Main Cancellation Loop (Mi-

nor)

1st Loop Error > 2.5V (No persistence

when amplifier first enabled.)

30 seconds

Error Cancellation Loop

(Minor)

2nd Loop Error > 2000 (No persistence

when amplifier first enabled.)

Loss of Pilot detected.

30 seconds

(on item 1)

044-05141 Rev. A 4-6 June 2003

NTUM30DA Installation & Service Manual

Section 5 Maintenance

5-1 Introduction

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

nel power amplifier. It also contains a list of test equipment required to perform the identified

tasks.

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 & Connectors 12 Months Inspect signal and power cables for frayed insulation.

Check RF connectors to be sure that they are tight.

Performance Tests No periodic maintenance is necessary beyond that

recommended by the base station manufacturer.

5-3 Field Replacement Of The Module

The NTUM30DA multichannel power amplifier module can be replaced in the field on site by a

qualified technician with adequate ESD protection and experience maintaining RF power amplifi-

ers and similar equipment.

To replace a power amplifier module, proceed as follows:

1. Turn off that specific module.

2. Disconnect the three RF cables and D-sub connectors (Power In and Data I/O).

3. Loosen 4 front panel captive screws that secure amplifier module to the base station.

4. Carefully remove amplifier module from the base station.

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

044-05141 Rev. A 5-1 June 2003

NTUM30DA 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

Refer to table 6-1 for troubleshooting suggestions.

Table 6-1 Troubleshooting

Symptom Suggested Action

MCPA Inoperative Check for proper power supply voltage.

MCPA Not Enabled Verify HPA-Allow-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.

044-05141 Rev. A 6-1 June 2003

NTUM30DA Installation & Service Manual

Field Failure Report

RMA No.: __________ S/N: __________ Customer: ___________________

Region: ________________ Technician: ___________________ Phone No.: __________

Manufacture Date: ___________ Failure Date: ___________ Site ID: _____________

Does customer want a Failure Analysis Report? Y / N

Failure Mode (please circle all that apply):

Loop Fail VSWR Low Pwr Ovr Pwr DC LPA Disable

Ovr Temp Alarm No RF Out Firmware Shipping Damage

Missing Hardware Connector Damaged

Failed During (please circle all that apply):

Installation Normal Operation Scheduled Maintenance

High Traffic Hour Medium Traffic Hour Low Traffic Hour

DOA? Y / N

Failure Frequency:

Intermittent Permanent

Failure Details:

Did other equipment fail at the same time? (Please describe)

044-05141 Rev. A 6-2 June 2003

Powerwave Technologies 5JS0067 W-CDMA Multi-Channel PCS Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc W-CDMA Multi-Channel PCS Amplifier I GENERAL DESCRIPTION

User Manual

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