Powerwave Technologies 5JS0059 1900MHz CDMA Multi-Channel Amplifier User Manual I GENERAL DESCRIPTION
Powerwave Technologies Inc 1900MHz CDMA Multi-Channel Amplifier I GENERAL DESCRIPTION
User Manual
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| Document Description | User Manual |
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| Document Type | User Manual |
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| Date Submitted | 2002-05-13 00:00:00 |
| Date Available | 2002-05-13 00:00:00 |
| Creation Date | 2002-04-04 09:55:08 |
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| Document Lastmod | 2002-04-04 10:10:33 |
| Document Title | I. GENERAL DESCRIPTION. |
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® INSTALLATION & SERVICE MANUAL MULTICHANNEL POWER AMPLIFIER NTGY81AC 1930-1990 MHz 50 WATTS AVERAGE POWER 04 April 2002 Powerwave Technologies, Inc. 1801 E. St. Andrew Place Santa Ana, CA 92705 044-xxxxx Rev. x Tel: (714) 466-1000 Fax: (714) 466-5800 Web Site: www.powerwave.com TABLE OF CONTENTS Par. No. 1-1 1-2 1-3 Section 1 General Description Page No. Introduction..................................................................................................................... 1-1 General Description....................................................................................................... 1-1 Functional and Physical Specifications........................................................................... 1-1 Section 2 Installation 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 Introduction..................................................................................................................... 2-1 Electrical Service Recommendations ............................................................................. 2-1 Unpacking and Inspection .............................................................................................. 2-1 Installation Instructions ................................................................................................... 2-2 +26 VDC Power and Ground Connector P1................................................................... 2-2 Alarms and Sensing Connector P2 ................................................................................ 2-3 Differential IIC Clock, Receive, and Transmit Connector P3.......................................... 2-4 IIC, Power, Alarms,and Controls Connector P4 ............................................................. 2-4 IIC, RS485, Power, and Other Signals Connector P5 .................................................... 2-6 Section 3 Operating Instructions 3-1 3-2 Introduction..................................................................................................................... 3-1 Initial Start-Up and Operating Procedures...................................................................... 3-1 Section 4 Principles of Operation 4-1 4-2 4-3 4-4 4-4.1 4-4.2 4-4.3 4-4.4 4-4.5 4-5 4-5 Introduction..................................................................................................................... 4-1 RF Input Signal ............................................................................................................... 4-1 RF Output Load .............................................................................................................. 4-1 Amplifier Functional Description ..................................................................................... 4-1 Input Amplifier................................................................................................................. 4-1 Predistortion Amplifier .................................................................................................... 4-1 Driver Amplifier ............................................................................................................... 4-2 Main Amplifier................................................................................................................. 4-2 Multifunction Board......................................................................................................... 4-2 Amplifier Module Cooling................................................................................................ 4-2 Power Distribution........................................................................................................... 4-2 044-xxxxx Rev. x ii TABLE OF CONTENTS (Continued) Par. No. 5-1 5-2 5-3 5-4 5-4.1 5-5 Section 5 Maintenance Page No. Introduction..................................................................................................................... 5-1 Periodic Maintenance ..................................................................................................... 5-1 Test Equipment Required For Test ................................................................................ 5-1 Performance Test........................................................................................................... 5-2 Amplifier Performance Test............................................................................................ 5-2 Field Replacement of the Module................................................................................... 5-5 Section 6 Troubleshooting 6-1 6-2 6-3 6-3.1 6-3.2 Introduction.......................................................................................................................6-1 Troubleshooting................................................................................................................6-1 Return for Service Procedures .........................................................................................6-1 Obtaining an RMA ............................................................................................................6-1 Repackaging for Shipment ...............................................................................................6-1 LIST OF ILLUSTRATIONS Figure No. 1-1 2-1 2-2 2-3 2-4 2-5 4-1 5-1 Page No. NTGY81AC Multichannel Power Amplifier ..................................................................... 1-3 +26 Vdc Power and Ground Connector P1 .................................................................... 2-2 Alarms and Sensing Connector P2 ................................................................................ 2-3 Differential IIC Clock, Receive, and Transmit Connector P3.......................................... 2-4 IIC, Power, Alarms, and Controls Connector P4 ............................................................ 2-4 IIC, RS485, Power and Other Connector P5.................................................................. 2-6 NTGY81AC Multichannel Power Amplifier Functional Block Diagram ........................... 4-2 NTGY81AC Amplifier Test Setup Diagram .................................................................... 5-3 LIST OF TABLES Table No. 1-1 2-1 2-2 2-3 2-4 2-5 5-1 5-2 5-3 6-1 Page No. NTGY81AC Multichannel Power Amplifier Functional Specifications..... ....................... 1-2 +26 Vdc Power and Ground Connector P1 Definition .................................................... 2-2 Alarms and Sensing Connector P2 Definition ................................................................ 2-3 Differential IIC Clock, Receive, and Transmit Connector P3 Definition.......................... 2-4 IIC, Power, Alarms, and Controls Connector P4 Definition ............................................ 2-5 IIC, RS485, Power and Other Connector P5 Definition.................................................. 2-6 Periodic Maintenance ..................................................................................................... 5-1 Test Equipment Required............................................................................................... 5-2 Multichannel Power Amplifier NTGY81AC Test Data Sheet .......................................... 5-4 Troubleshooting.............................................................................................................. 6-1 044-xxxxx Rev. x iii Section GENERAL DESCRIPTION 1-1. INTRODUCTION This manual contains information and procedures for installation, operation, and maintenance of Powerwave’s model NTGY81AC 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 1-2. GENERAL DESCRIPTION The NTGY81AC is a linear, multichannel power amplifier that operates in the 60 MHz frequency band from 1930 MHz to 1990 MHz. It is designed to be mounted in an enclosure with EMI containment. Its flat base plate allows for mounting on a flat thermal-absorbing surface to provide adequate heat dissipation. Each amplifier module has a power, alarm, and control connector that allows the host system to monitor the amplifier module performance. Primary power for the amplifier is +26 Vdc. 1-3. FUNCTIONAL AND PHYSICAL SPECIFICATIONS Functional and physical specifications for the amplifier are listed in table 1-1. 044-xxxxx Rev. x 1-1 Table 1-1. NTGY81AC Multichannel Power Amplifier Functional Specifications Frequency Range Maximum Average Input Power Continuous Average Output Power Spurious Emissions @ Maximum Rated Output Power (50 W / 47 dBm) RF Gain Gain Flatness: Output Protection: Input Port Return Loss: Out of Band Spurious: DC Input Power: Operating Temperature: Storage Temperature: Operating Humidity: Storage Humidity: Interface Connectors: RF Input----------------------------------RF Output -------------------------------+26 Vdc Power and Ground --------Alarms and Sensing ------------------Differential IIC Clock, Rcv., Xmit. --IIC, Power, Alarms, Controls--------IIC, RS485, Power, Other Signals -Dimensions (inches): 044-xxxxx Rev. x 1930-1990 MHz (60 MHz Bandwidth) 13 dBm 50 Watts Frequency Offset Requirement Meas. Bandwidth Max. Min. 0.885-1.25 MHz -47 dBc 30 kHz 1.25-1.98 MHz -16.5 dBm 37.5 kHz 1.98-2.25 MHz -58 dBc 30 kHz >2.25 MHz -15 dBm 1 MHz 47 ±2 dB ± 0.2 dB for any 1.25-MHz band within frequency range. Mismatch Protected VSWR 2:1 Max. Less than -15 dBm / 1 MHz +26 ± 0.5 Vdc, 260 mV p-p max. ripple, ≤500 watts -15 ºC. to +85 ºC. (heatsink temperature) -40 ºC. to +85 ºC. 5 % - 95 % Relative Humidity (Noncondensing) 5 % - 95 % Relative Humidity (Noncondensing) SMA Female SMA Female 3W3 D-Sub (Connector P1) 14-Position Micro-Fit 3.0 (Connector P2) 6-Position Micro-Fit 3.0 (Connector P3) 26-Position High Density D-Sub (Connector P4) 18-Position Micro-Fit 3.0 (Connector P5) 11.00 x 14.50; height: 1.70 1-2 P1 P4 P5 P3 P2 RF OUT RF IN Figure 1-1. NTGY81AC Multichannel Power Amplifier 044-xxxxx Rev. x 1-3 Section INSTALLATION 2-1. INTRODUCTION This section contains unpacking, inspection, and installation instructions and recommendations for the Model NTGY81AC Multi Channel Power Amplifier. Carefully read all material in this section 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 Communications 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 +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 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 thermal type, capable of handling the maximum anticipated inrush current, in a load center with a master switch. 2-3. UNPACKING AND INSPECTION This equipment has been operated, tested and calibrated at the factory. Carefully open the container(s) and remove the amplifier module(s). Retain all packing material that can be reassembled 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 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 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 presence of the delivery person. If the equipment is damaged, the carrier is your first area of recourse. 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 CARRIER'S PERFORMANCE 044-xxxxx Rev. x 2-1 2-4. INSTALLATION INSTRUCTIONS (Refer to figure 1-1) The NTGY81AC amplifier module is designed for installation on a heatsink that permits access to the module for connection of RF cables and the power, alarm, and control connector. To install the amplifier proceed as follows: 1. Install amplifier on heatsink with thermally conductive material inserted between amplifier module and heatsink, and secure in place with appropriate mounting screws. 2. Connect the antenna cable to RF OUT female SMA connector. 3. Connect the transceiver output cable to RF IN frmale SMA connector. WARNING Turn off external primary DC power before connecting any cables. 4. Connect power, alarm, and control cables to matching P1 through P5 connectors. Refer to paragraphs 2-5 through 2-9 following. 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. DC input voltage should be +26 ±0.5 Vdc. If the DC input voltage is above or below 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. 2-5. +26 VDC POWER AND GROUND CONNECTOR P1 The +26 Vdc power and ground connections on the amplifier are made through an 3-pin female D-Sub connector (figure 2-1) and are listed and described in table 2-1. Figure 2-1. +26 Vdc Power and Ground Connector P1 Table 2-1. +26 Vdc Power and Ground Connector P1 Definition 044-xxxxx Rev. x PIN SIGNAL +26V +26V_RTN Chassis Gnd. DESCRIPTION +26 Vdc for MCPA +26 Vdc return, grounded to MCPA chassis ground. Chassis Ground 2-2 2-6. ALARMS AND SENSING CONNECTOR P2 The alarms and sensing connections on the amplifier are made through a 14-pin micro-fit connector (figure 2-2) and are listed and described in table 2-2. Figure 2-2. Alarms and Sensing Connector P2 Table 2-2. Alarms and Sensing Connector P2 Definition PIN SIGNAL +5V_AIM +5V_AIM_RTN +26V_ALARM +15V_ALARM REMOTE_SENSE REMOTE_SENSE_RTN +5V_ALARM NC 26ARTN 10 ARTN 11 +26V_FAN 12 +26V_FAN_RTN 13 +26V_FAN 14 +26V_FAN_RTN 044-xxxxx Rev. x DESCRIPTION 5-volt supply for the AIM; routed directly to the fan assembly / AIM connector 5-volt supply return for the AIM; routed directly to the fan assembly / AIM connector 26V HPCA alarm input 15V HPCA alarm input Remote sense for HPCA; connected directly to 26V supply Remote sense return for HPCA; connected directly to 26V supply return 5V HPCA alarm input Not connected 26V alarm return connected to 26V return on the MCPA 5V and 15V alarm return connected to 26V return on the MCPA 26V supply for the fans; routed to fan assembly / AIM connector 26V supply return for the fans; routed to fan assembly / AIM connector 26V supply for the fans; routed to fan assembly / AIM connector 26V supply return for the fans; routed to fan assembly / AIM connector 2-3 2-7. DIFFERENTIAL IIC CLOCK, RECEIVE, AND TRANSMIT CONNECTOR P3 The alarms and sensing connections on the amplifier are made through a 6-pin micro-fit connector (figure 2-3) and are listed and described in table 2-3. Figure 2-3. Differential IIC Clock, Receive, and Transmit Connector P3 Table 2-3. Differential IIC Clock, Receive, and Transmit Connector P3 Definition PIN SIGNAL IIC_CLK+ DESCRIPTION Differential IIC Clock to the DPM IIC_CLK- Differential IIC Clock to the DPM IIC_RX_DATA+ Differential IIC Receive Data (from DPM) IIC_RX_DATA- Differential IIC Receive Data (from DPM) IIC_TX_DATA+ Differential IIC Transmit Data (to DPM) IIC_TX_DATA- Differential IIC Transmit Data (to DPM) 2-8. IIC, POWER, ALARMS, AND CONTROLS CONNECTOR P4 The alarms and sensing connections on the amplifier are made through a 26-pin high density D-Sub connector (figure 2-4) and are listed and described in table 2-4. Figure 2-4. IIC, Power, Alarms, and Controls Connector P4 044-xxxxx Rev. x 2-4 Table 2-4. IIC, Power, Alarms, and Controls Connector P4 Definition PIN SIGNAL +26_FAN +26_FAN_RTN FAN_ALARM1 FAN_ALARM2 FAN_ALARM3 AUX_ALARM+ AUX_ALARM- AUX_CTRL1 AUX_CTRL2 10 +5V_AIM_RTN 11 +5V_AIM 12 IIC_CLK+ DESCRIPTION 26V supply to the fans; routed from 12-position HPCA connector 26V supply returnto the fans; routed from 12-position HPCA connector Alarm for one of three fans in fan assembly / AIM. Generated by the fan assembly / AIM and sent to the MFRM via the MCPA’s RS485 link. Alarm for one of three fans in fan assembly / AIM. Generated by the fan assembly / AIM and sent to the MFRM via the MCPA’s RS485 link. Alarm for one of three fans in fan assembly / AIM. Generated by the fan assembly / AIM and sent to the MFRM via the MCPA’s RS485 link. Analog voltage signal that is generated from either an external power combiner or an intrusion alarm mechanism, passed to the MFRM through the RS485. Analog voltage signal that is generated from either an external power combiner or an intrusion alarm mechanism, passed to the MFRM through the RS485. Contact closure switch on the MCPA but controlled by the MFRM software. Default status is OPEN upon power up and CLOSED on power down conditions. Contact closure switch on the MCPA but controlled by the MFRM software. Default status is OPEN upon power up and CLOSED on power down conditions. 5V supply return for the AIM. Comes from the HPCA via connector P2 and routed through MCPA. 5V supply for the AIM. Comes from the HPCA via connector P2 and routed through MCPA Differential IIC clock to the fan assembly / AIM 13 IIC_CLK- Differential IIC clock to the fan assembly / AIM 14 IIC_RX_DATA+ Differential IIC receive data (from fan assembly / AIM) 15 IIC_RX_DATA- Differential IIC receive data (from fan assembly / AIM) 16 IIC_TX_DATA+ Differential IIC transmit data (to fan assembly / AIM) 17 IIC_TX_DATA- 18 FORCE_ON+ 19 FORCE_ON- 20 +26V_FAN Differential IIC transmit data (to fan assembly / AIM) Routed directly from MTRM connector; turns on LEDs (in the AIM) during power-up sequence. Routed directly from MTRM connector; turns on LEDs (in the AIM) during power-up sequence. 26V supply for the fans from (HPCA) connector P2 21 +26V_FAN_RTN 26V supply return for the fans from (HPCA) connector P2 22-26 NC 044-xxxxx Rev. x Not connected 2-5 2-9. IIC, RS485, POWER, AND OTHER SIGNALS CONNECTOR P5 The alarms and sensing connections on the amplifier are made through a 18-pin micro-fit connector (figure 2-5) and are listed and described in table 2-5. Figure 2-5. IIC, RS485, Power, and Other Signals Connector P5 Table 2-5. IIC, RS485, Power, and Other Signals Connector P5 Definition PIN SIGNAL DESCRIPTION Turns on LEDs (in the AIM) during power up sequence; FORCE_ON+ routed directly from MTRM connector to fan assembly / AIM connector Turns on LEDs (in the AIM) during power up sequence; FORCE_ONrouted directly from MTRM connector to fan assembly / AIM connector Enables MCPA when high. Requires enable command +ALLOW_HPA_ENABLE via RS485 and HW_ENABLE high impedance to ground and no shutdown conditions exist. Enables MCPA when high. Requires enable command -ALLOW_HPA_ENABLE via RS485 and HW_ENABLE high impedance to ground and no shutdown conditions exist. MCPA_TX+ Differential RS485 link to MTRM MCPA_TX- Differential RS485 link to MTRM MCPA_RX+ Differential RS485 link from MTRM MCPA_RX- Differential RS485 link from MTRM IIC_CLK+ Differential IIC clock from MTRM 10 IIC_CLK- Differential IIC clock from MTRM 11 IIC_RX_DATA+ Differential IIC receive data (from MTRM) 12 IIC_RX_DATA- Differential IIC receive data (from MTRM) 13 IIC_TX_DATA+ Differential IIC transmit data (to MTRM) 14 IIC_TX_DATA- 15 +5V_DC_IN 16 +5V_DC_RTN 17 CABLE_DETECT 18 HW_ENABLE Differential IIC transmit data (to MTRM) +5V supply voltage for the IIC circuit on MCPA; not used in any other circuits. +5V supply voltage return for the IIC circuit on MCPA; not used in any other circuits. Cable detect line connected to GPI/O port of MTRM microprocessor. Pulled high via +5V_DC_IN; connected to reset pin on microcontroller to allow MTRM reset if necessary. Hardware enable signal. MCPA enabled when shorted to chassis ground. 044-xxxxx Rev. x 2-6 Section OPERATING INSTRUCTIONS 3-1. INTRODUCTION This section contains operating instructions for the Multicarrier Cellular Amplifier. 3-2. INITIAL START-UP AND OPERATING PROCEDURES There are no operating controls or indicators on the NTGY81AC amplifier module. To perform the initial start-up, proceed as follows: 1. Double check to ensure that all input and output cables are properly connected. CAUTION Before applying power, make sure that the input and output of the amplifier are properly terminated at 50 ohms. Do not operate the amplifier without a load attached. Refer 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 coaxial 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-xxxxx Rev. x 3-1 Section 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 NTGY81AC amplifier (figures 1-1 and 4-1) is a linear, multichannel power amplifier that operates in the 60 MHz frequency band from 1930 MHz to 1990 MHz at an output power of 50 watts. Each amplifier is a self-contained module and is functionally independent of any other amplifier modules 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 RS485 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 variations, for example those due to temperature, are reduced to the passive reference variations. The amplifier module is comprised of: An input amplifier A predistortion amplifier 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, VVAs, and phase shifters for gain control and phase sweeping functions. They are controlled by a microprocessor on the multifunction board. At its output, the input amplifier splits the signal to the predistortion amplifier and carrier cancellation circuits. 4-4.2. PREDISTORTION AMPLIFIER The predistortion amplifier predistorts the input signal in a way that it linearizes the output of the main amp at 50 watts. It also contains the main loop VVAs and phase shifters. All the predistortion voltages and loop voltages are controlled by a microprocessor. 044-xxxxx Rev. x 4-1 4-4.3. DRIVER AMPLIFIER The driver amplifier consists of two stages of class AB amplification which provide approximately 40 dB of gain in the 60 MHz frequency band from 1930 MHz to 1990 MHz. The amplifier operates on +26 Vdc, and a safe bias voltage which is controlled by microprocessors. 4-4.4. MAIN AMPLIFIER The main amplifier employs two class AB amplification stages for maximum efficiency. It provides approximately 25 dB of gain in the 60 MHz frequency band. The output from the main amplifier is typically 48.6 dBm. The amplifier operates on +26 Vdc, and gate bias voltages controlled by microprocessors. 4-4.5. MULTIFUNCTION BOARD The multifunction board consists of control and alarm circuits. The MCPA communicates to the host system through the multifunction board which gathers the status information of the amplifier and reports to the host system via the RS485 interface when instructed. It also protects the MCPA from adverse conditions such as overpower, input overdrive, overvoltage, etc. A microprocessor on the multifunction board also controls two loops in the feed-forward system. INPUT AMPLIFIER PREDISTORTION AMPLIFIER DRIVER AMPLIFIER MAIN AMPLIFIER RF IN RF OUT MULTIFUNCTION BOARD (ALARMS AND LOOP CONTROLS) Figure 4-1. NTGY81AC Multichannel 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-xxxxx Rev. x 4-2 Section MAINTENANCE 5-1. INTRODUCTION This section contains periodic maintenance and performance test procedures for the multichannel 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 repair 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 Inspection Cables and Connectors Performance Tests INTERVAL ACTION 12 Months Inspect signal and power cables for frayed insulation. Check RF connectors to be sure that they are tight. Perform annual test per paragraph 5-5. 12 Months 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 must be calibrated to 0.05 dB resolution. Any deviation from the nominal attenuation must be accounted for and factored into all output readings. 044-xxxxx Rev. x 5-1 Table 5-2. Test Equipment Required MENCLATURE Signal Generator 30 dB Attenuator, 250 Watt Spectrum Analyzer Coax Directional Coupler Power Meter / Sensor Network Analyzer Current Probe Source Diskette Driver PA (1930-1990 MHz) MANUFACTURER Agilent (H.P.) Tenuline H.P. H.P. H.P. H.P. MODEL ESG4433B 8562E 778D 437B / 8481A 8753D Powerwave 12 dB gain, P1dB = 29 dBm (min) 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. 5-4.1. AMPLIFIER PERFORMANCE TEST. To perform the test, proceed as follows: 1. Connect test equipment as shown in figure 5-1. NOTE Do not apply any RF signals at this time. AMPLIFIER SPURIOUS EMISSIONS TEST: 2. Load the MFRM waveform on the ESG (signal generator). Apply this signal through a driver amplifier to the MCPA so that the RF signal going into the MCPA is approximately 0 dBm (adjust the input RF signal level to get 47 dBm output power). Measure spurious emissions. Verify that it is within specification. GAIN TEST: 3. Set input power level to power amplifier at 0 dBm (1932, 1960, and 1987 MHz). 4. Measure the output power in dBm. 5. Subtract input power (in dBm) from output power (in dBm) to get gain. 6. Check the amplifier gain across the band from 1930 MHz to 1990 MHz. Gain should be 47 ±2 dB. Record test data in table 5-3. INPUT RETURN LOSS TEST: 7. Read and record the S11 return loss measurement on network analyzer. Record test data in table 5-3. 044-xxxxx Rev. x 5-2 Figure 5-1. NTGY81AC Amplifier Test Setup Diagram 044-xxxxx Rev. x 5-3 Table 5-3. Multichannel Power Amplifier NTGY81AC Test Data Sheet Tested By: ___________________ Serial No: ________________ Pass/Fail: ____________________ Date: ____________________ 50W MCPA Test Test Conditions: Load and source impedance: 50 ohms, VSWR < 1.2:1 Supply voltage: +26 Vdc ± 0.4 Vdc (unless otherwise noted). Network Analyzer Span: 60 MHz Marker #1 = 1930 MHz, #2 = 1960 MHz, #3 = 1990 MHz CONDITION TEST 1.00 1.01 NETWORK ANALYZER Gain 1.02 Gain Flatness 1.03 1.04 2.00 Input Return Loss, worst case In band Output Return Loss, worst case in band CDMA TESTS (Spurious Emissions) 3 TONE: W-CDMA @ 50W out MIN 45.0 dB 0 dB MAX FREQUENCY (MHz) 1930 1960 1990 3860 3920 3980 1925 1945 1965 49.0 dB 0.4 dB/ 1.25 MHz -10 dB -15 dB RBW= 3KHz; VBW=10KHz 2.01 ∆ @ +2.25 Mhz 2.02 ∆ @ –2.25 Mhz 2.03 2nd Harmonic -16 dBm/ 1 MHz -16 dBm/ 1 MHz -16 dBm/ 1 MHz 2.04 Pilot 16 dBm/ 1 MHz 2.05 19 A Current @ 50 W out 044-xxxxx Rev. x 5-4 5-5. FIELD REPLACEMENT OF THE MODULE The NTGY81AC 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 amplifiers and similar equipment. To replace a power amplifier module, proceed as follows: 1. Turn off 26 Vdc power to that specific module. 2. Disconnect the two RF cables and connectors P1 through P5. 3. Remove 13 screws that secure amplifier module to heat sink. 4. Carefully remove amplifier module from heat sink. 5. Add Thermstrate thermal interface pad to surface of replacement amplifier which mates with heatsink. 6. Install replacement in reverse order of steps 1 through 4 above. 044-xxxxx Rev. x 5-5 Section TROUBLESHOOTING 6-1 INTRODUCTION This section contains a list of problems which users have encountered and a few suggested actions that may 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. NOTE Check your sales order and equipment warranty before attempting to service or repair 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. SYMPTOM Table 6-1. Troubleshooting. SUGGESTED ACTION MCPA Inoperative 1. Check for proper power supply voltage. MCPA Not Enabled 1. 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) 7979283 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-xxxxx Rev. x 6-1
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