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Troubleshooting
Related Manuals for Powerwave Technologies NTGS86AA
Summary of Contents for Powerwave Technologies NTGS86AA
- Page 1 INSTALLATION & SERVICE MANUAL SINGLE CHANNEL POWER AMPLIFIER NTGS86AA 869-894 MHz 25 WATTS AVERAGE POWER 12 August 1998 Powerwave Technologies, Inc. Tel: 949-757-0530 2026 McGaw Avenue Fax: 949-757-0941 Irvine, CA 92614 Web Site: www.pwav.com TABLE OF CONTENTS 044-05045 Rev. A...
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Page 2: Table Of Contents
Par. Section 1 Page General Description Introduction .................... 1-1 General Description ................1-1 Functional and Physical Specifications ..........1-1 Section 2 Installation Introduction .................... 2-1 Electrical Service Recommendations............. 2-1 Unpacking and Inspection..............2-1 Installation Instructions................2-2 Amplifier Module Power, Alarm, and Control Connector......2-2 RS485 Connector................... - Page 3 NTGS86AA Single Channel Power Amplifier ......... 1-3 Power, Alarm, and Control Connector (18-Pin Molex) ......2-2 RS485 Connector................... 2-3 NTGS86AA Single Channel Power Amplifier Functional Block Diagram 4-2 NTGS86AA Amplifier Test Setup Diagram ..........5-3 RF Input (CDMA Source) ............... 5-3...
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Page 4: General Description No
Section 6: Troubleshooting 1-2. GENERAL DESCRIPTION The NTGS86AA is a linear, single-channel power amplifier that operates in the 25 MHz frequency band from 869 MHz to 894 MHz. It is designed as a self-contained module with EMI containment for use in both an indoor and outdoor North American Cellular Base Stations. Its flat base plate allows for mounting on a flat thermal-absorbing surface to provide adequate heat dissipation, thereby avoiding the use of any built-in fans. - Page 5 Table 1-1. NTGS86AA Single Channel Power Amplifier Functional Specifications Frequency Range 869-894 MHz (25 MHz Bandwidth) Maximum Average Input Power 13 dBm Continuous Average Output Power 25 Watts Spurious Emissions @ Maximum Frequency Requirement Meas. Bandwidth Rated Output Power (44 dBm)
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Page 6: Ntgs86Aa Single Channel Power Amplifier
1.670 RF OUTPUT 9.900 RF INPUT 12.515 18 PIN MOLEX CONNECTOR RS485 CONNECTOR RF SAMPLE Figure 1-1. NTGS86AA Single Channel Power Amplifier... -
Page 7: Electrical Service Recommendations
2-1. INTRODUCTION This section contains unpacking, inspection, and installation instructions and recommendations for the Model NTGS86AA Single 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. -
Page 8: Installation Instructions
2-4. INSTALLATION INSTRUCTIONS (Refer to figure 1-1) The NTGS86AA 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. -
Page 9: Rs485 Connector
SIGNAL DESCRIPTION SIGNAL NAME Temperature Output (0-4.7 volts) TEMP_OUT Reverse Power Detection (0-4.7 volts) REV_PWR Forward Power Detection (0-4.7 volts) FWR_PWR Ground − Anxiety output (RS 422 level) ANX (-) Ground Ground Ground + Anxiety output (RS 422 level) ANX (+) + Enable input (RS 422 level) ENABLE (+) −... -
Page 10: Operating Instructions
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 NTGS86AA 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. -
Page 11: Rf Output Load
4-4. AMPLIFIER FUNCTIONAL DESCRIPTION The NTGS86AA 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 MHz at an output power of 25 watts. Each amplifier is a self-contained module and is functionally independent of any other amplifier modules in the system. -
Page 12: 4-4.3 Amplifier Module Cooling
SPURIOUS DETECTION output signal DSP CIRCUIT ALARM CIRCUIT Figure 4-1. NTGS86AA Single Channel Power Amplifier Functional Block Diagram 4-4.3. ALARM MONITORING AND CONTROL In the amplifier, all normal variations are automatically compensated for by the spurious detector control. However, when large variations occur beyond the adjustment range of the loop control, a loop fault will occur. -
Page 13: Maintenance
Section MAINTENANCE 5-1. INTRODUCTION This section contains periodic maintenance and performance test procedures for the Single Channel 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. -
Page 14: Performance Test
Table 5-2. Test Equipment Required MANUFACTURER MODEL MENCLATURE Signal Generator H.P. 8656B 20 dB Attenuator, 250 Watt Tenuline 20 dB Attenuator, 20 Watt (2 each) Tenuline Spectrum Analyzer H.P. 8560E Coax Directional Coupler H.P. 778D Power Meter / Sensor H.P. 437B / 8481A Arbitrary Waveform Generator Sony... - Page 15 INPUT RETURN LOSS TEST: 6. Read and record the S return loss measurement on network analyzer. Record test data in table 5-3. Figure 5-1. NTGS86AA Amplifier Test Setup Diagram...
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Page 16: Single Channel Power Amplifier Test Data Sheet
Table 5-3. Single Channel Power Amplifier Test Data Sheet DATE__________________________________ MODULE S/N ___________________________ TEST CONDITIONS: Load and Source Impedance: 50 Ohms VSWR: < 1.2:1 Supply Voltage: +26 Vdc ±0.1 Vdc TEST SPECIFICATION DATA RF Gain Vcc = 26 Vdc Table 1-1 Table 1-1 PO = 25 W -1 dB... -
Page 17: Field Replacement Of The Module
5-5. FIELD REPLACEMENT OF THE MODULE The NTGS86AA single channel power amplifier module can be replaced in the field on site by a qualified technician with experience maintaining RF power amplifiers and similar equipment: To replace a power amplifier module, proceed as follows: Turn off 26 Vdc power to that specific module. -
Page 18: Return For Service Procedures
Alarm Output is RS 422 High Verify input RF is within specified power and frequency limits 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.
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