Powerwave Technologies 5JS0047 Tornado, Model NTGY71AA User Manual 5

Powerwave Technologies Inc Tornado, Model NTGY71AA 5

sect 5

044-05080 Rev. A 5-1MAINTENANCE5-1. INTRODUCTIONThis section contains periodic maintenance and performance test procedures for the multichannelpower amplifier. It also contains a list of test equipment required to perform the identified tasks.NOTECheck your sales order and equipment warrantybefore attempting to service or repair the unit. Do notbreak the seals on equipment under warranty or thewarranty will be null and void. Do not returnequipment for warranty or repair service until propershipping instructions are received from the factory.5-2. PERIODIC MAINTENANCEPeriodic maintenance requirements are listed in Table 5-1. Table 5-1 also lists the intervals atwhich the tasks should be performed.Table 5-1. Periodic MaintenanceTASK INTERVAL ACTIONInspectionCables and Connectors 12 Months Inspect signal and power cables for frayedinsulation. Check RF connectors to besure that they are tight.Performance Tests 12 Months Perform annual test per paragraph 5-5.5-3. TEST EQUIPMENT REQUIRED FOR TESTTest equipment required to test the amplifier is listed in Table 5-2. Equivalent test equipment maybe substituted for any item, keeping in mind that a thermistor type power meter is required.NOTEAll RF test equipment must be calibrated to 0.05dB resolution. Any deviation from the nominalattenuation must be accounted for and factoredinto all output readings.Section5
044-05080 Rev. A 5-2Table 5-2. Test Equipment RequiredMENCLATURE MANUFACTURER MODELSignal Generator Agilent (H.P.) ESG4433B30 dB Attenuator, 250 Watt TenulineSpectrum Analyzer H.P. 8562ECoax Directional Coupler H.P. 778DPower Meter / Sensor H.P. 437B / 8481ANetwork Analyzer H.P. 8753DCurrent ProbeSource Diskette Powerwave5-4. PERFORMANCE TESTPerformance testing should be conducted every 12 months to ensure that the amplifier systemmeets the operational specifications listed in table 5-3. Also verify system performance after anyamplifier module is replaced in the field. The test equipment required to perform the testing is listedin 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.NOTEDo 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 driveramplifier to the MCPA so that the RF signal going into the MCPA is approximately -1.5dBm (adjust the input RF signal level to get 48.5 dBm output power). Measure spuriousemissions. Verify that it is within specification.GAIN TEST:3. Set input power level to power amplifier at –1.5 dBm (869, 881, and 894 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 869 MHz to 894 MHz. Gain should be 50 ±2dB. 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 intable 5-3.
044-05080 Rev. A 5-3Figure 5-1. NTGY71AA Amplifier Test Setup Diagram
044-05080 Rev. A 5-4Table 5-3. Multichannel Power Amplifier NTGY71AA Test Data SheetTested By: ______________________ Serial No: ____________________Pass/Fail: ______________________ Date: ________________________70W MCPA TestTest Conditions: Load and source impedance: 50 ohms, VSWR < 1.2:1Supply voltage: (+26) Vdc ±± 0.1 Vdc (unless otherwise noted).Network Analyzer Span: 25 MHzMarker #1 = 869 MHz, #2 = 881 MHz, #3 = 894 MHzTEST CONDITION MIN MAX FREQUENCY (MHz)1.00 NETWORK ANALYZER 869 881 8941.01 Gain 49.5dB 50.5dB1.02 Gain Flatness 0 dB ±0.2 dB/1.25 MHz1.03 Input Return Loss, worst case In band -14 dB1.04 Output Return Loss, worst case In band -14 dB2.00 CDMA TESTS3 CDMA TONES: @ 70W out•Spec. Ana. With 10 MHz Res. BW2.01 ∆∆@ +1.5MHz -61 dBc2.02 ∆∆@ –1.5MHz -61 dBc2.03 Current @ 70 W (48.5 dBm) out 23.4A3.00 RMS Power Detection3.01 RMS reading in Watts @ Pout = 48.5 dBm -0.5dB +0.5dB3.02 RMS reading in Watts @ Pout = 43.5 dBm -0.5dB +0.5dB4.00 ALARM TESTS4.01 Excessive DC Voltage (>27 V) Check4.02 Verify Over Power Alarm (>51 dBm for >3 sec) Check4.03 FWD PWR Voltage (4.26V @ 48.5 dBm) Check4.04 REV PWR Voltage (4.26V @ 48.5 dBm) Check5.00 FIRMWARE VERSION 2.05
044-05080 Rev. A 5-55-5. FIELD REPLACEMENT OF THE MODULEThe NTGY71AA multichannel power amplifier module can be replaced in the field on site by aqualified technician with 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 amplifierwhich mates with heatsink.6. Install replacement in reverse order of steps 1 through 4 above.

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