Powerwave Technologies 5JS0061 Amplifier User Manual PAF 0850 001

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869-894 MHz Model NTGS86AB Single-Channel Power Amplifier Installation & Service Manual  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 044-05126 Rev. A 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  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 044-05126 Rev. A October 2002 iv

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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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. Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 044-05126 Rev. A 1-2 October 2002

NTGS86AB Installation & Service Manual Power, Alarm and Control Interface RF Output RF Input RF SampleTest (RS485) Figure 1-1. NTGS86AB Amplifier Isometric View Figure 1-2. NTGS86AB Amplifier Top and Side Views with Dimensions  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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 10Pin 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  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 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.  Copyright Powerwave Technologies, Inc., October 2002. All rights reserved 044-05126 Rev. A 6-1 October 2002

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