E675JS0056Multi Carrier RF Power Amplifier

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved All specifications are subject to change without notice. Contact the factory for complete performance data. 044-05095 Rev. A 1-1 September 2001 Section 1 General Description 1-1 Introduction This manual contains information and procedures for installation, operation, and maintenance of Powerwave’s G3S-800-140-031 multicarrier RF power amplifier. 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 G3S-800-140-031 (see figure 1-1) is a linear, feed-forward power amplifier that operates in the frequency band from 851 MHz to 869 MHz. The amplifier can simultaneously transmit multi- ple frequencies, with better than -60 dBc third order intermodulation distortion (IMD). It is de- signed for use in an amplifier system that is modular in design, and is ideally suited for use in base stations. The plug-in Model G3S-800-140-031 amplifier modules can each provide 140 watts of power and function completely independently of each other. The amplifier modules are designed for parallel operation to produce high peak power output and backup redundancy for remote applications. All solid-state, the system is designed to provide trouble-free operation with minimum maintenance. The system's modular construction and unique and highly effective LED-based operational status and fault indicators help minimize downtime. The turn-on and turn- off sequences of voltages are fully automatic, as is overload protection and recycling. Inadver- tent operator damage from front panel manipulation is virtually impossible. The amplifier module has a status connector that allows the host system to monitor the amplifier module performance. The front panel of each amplifier module has unit level status/fault indica- tors and an RF on/off/reset switch. Primary power for the amplifier is +27 Vdc. Cooling for each plug-in amplifier module is provided by four fans, two mounted on the front and two on the rear of the module. The fans draw outside air through the front of the module and exhaust hot air out through the rear of the module. 1-3 Functional And Physical Specifications Functional and physical specifications for the amplifier are listed in table 1-2. 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. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved All specifications are subject to change without notice. Contact the factory for complete performance data. 044-05095 Rev. A 1-2 September 2001 1-5 Ordering Information Table 1-1 following gives the part numbers and descriptions to be used when ordering either an entire amplifier or replacement fans. Table 1-1 Major Amplifier Components Model Number Description G3S-800-140-031 140 W 851-869 MHz MCPA Module 800-01075-003 Front fan assembly 800-00972-002 Rear fan assembly. Table 1-2 G3S-800-140 Multicarrier Cellular Amplifier Functional Specifications Frequency Range 851-869 MHz (18 MHz Bandwidth) Instantaneous Bandwidth 18 MHz Total Maximum Input Power -6.54 dBm Total Output Power 140 W (51.46 dBm) typical (1 Module) IMD and In-band Spurious, mean measurement, 30 kHz bandwidth@ +26 to +28Vdc, 25°C -60dBc or -16 dBm max @ up to 16 equal power CW tones with a combined maximum power of P 0 with a max single carrier power of P 0 /16 with maximum crest factor of 7.5dB up to the maximum rated RF output power. Out of Band Spurious & Noise, measured in 30 KHz BW -60 dBc max @ +26 to +28 Vdc RF Gain 58 dB +0.5 dB Gain Flatness: ±0.5 dB @ 27 Vdc ±1 Vdc Gain Variation w/ Voltage and Frequency + 0.5 dB; 26 to 28 Vdc Gain Variation Over Temperature: ±0.5 dB Noise Figure 25 dB max Output Protection: Mismatch Protected Input Port Return Loss: 16 dB min Harmonics: Better than -50 dBc Out of Band Spurious: Better than -60 dBc Duty Cycle: Continuous DC Input Power: +27 Vdc ±1 Vdc, 70 amps max Operational +21 Vdc to 30 Vdc DC Circuit Breaker Rating 100 Amps Operating Temperature: 0º C to +50º C Storage Temperature: -40º C to +85º C Operating Humidity: 0 % to 80 % Relative Humidity (noncondensing) Storage Humidity: 0 % to 100 % Relative Humidity (noncondensing) DC Input, Summary Alarm, and RF Input / Output Connectors: 21-Pin D-Subminiature Combo Connector plus single- pin D-Sub connector for additional DC capability. Heat Generation 5510 BTUS (1 Amplifier) Weight 50 lbs. Dimensions: 5.20” High, 17.00” Wide, 20.00” Deep Electrical Service Recommendations Circuit Breakers Capable of handling anticipated inrush current (nor- mally 25% over equipment maximum current draw), in a load center with a master switch. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved All specifications are subject to change without notice. Contact the factory for complete performance data. 044-05095 Rev. A 1-3 September 2001 Figure 1-1 G3S-800-140-031

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 2-1 September 2001 Section 2 Installation 2-1 Introduction This section contains installation recommendations, unpacking, inspection, and installation in- structions for the Multicarrier Cellular 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 review the Federal Communications Commission (FCC) rules as 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 +27 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 capable of handling the anticipated inrush cur- rent (normally 25% over equipment maximum current draw), in a load center with a master switch. A 70-amp circuit breaker installed in the power distribution unit is recommended for each amplifier. Either 2 or 4 AWG DC wire should be installed for each amplifier based on the cable design and length. Table 2-1 Averaged Current Amplifier Power No. Of Amplifiers 3 Sector Averaged Current 2 Sector Averaged Current 1 Sector Averaged Current 140 12 588 140 9 441 504 140 6 294 336 378 140 1 49 56 63 2-3 Air Conditioning Each G3S-800-140-031 amplifier generates 5971 BTUs of heat at full power. A fully populated MCR30829-1-3 subrack operating at full power will generate 17,913 BTUs of heat. A full three- sector site employing three fully populated MCR30829-1-3 subracks will generate 53,739 BTUs of heat at full power (360W per subrack). A five-ton air conditioner is needed to cool this Power- wave equipment. A full three-sector site probably needs at least a five-ton air conditioner to cool all of the site's equipment, based on heat load averaging as described in table 2-2. Since all the amplifiers are not running at full capacity at the same time in normal operation, table 2-2 de- scribes the heat load for a 3 sector (70%), 2 sector (80%) and omni (90%) site. Perform a site survey to determine actual air conditioning needs. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 2-2 September 2001 Table 2-2 Averaged Heat Loading Amplifier Power No. Of Amplifiers 3 Sector Averaged BTU's 2 Sector Averaged BTU's 1 Sector Averaged BTU's 140 12 50,156.4 140 9 37,617.3 42,991.2 140 6 25,078.2 28,660.8 32,243.4 140 1 4,179.7 4,776.8 5,373.9 2-4 Unpacking And Inspection This equipment has been operated, tested and calibrated at the factory. Only in the event of se- vere shocks or other mistreatment should any substantial readjustment be required. 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 extrane- ous packing material in the connector or fans. Inspect the rear panel connector for bent connec- tor pins. 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. Pow- erwave 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 PERFORM- ANCE. 2-5 Installation Instructions (refer to figures 1-1 and 2-1) The G3S-800-140-031 amplifier module is designed for installation in a subrack for connection of DC power, RF, and monitor cables. To install the amplifier proceed as follows: 1. Install the subrack in an equipment rack and secure in place, based on the installation in- structions from the appropriate manual for the subrack being installed. 2. Connect the subrack RF output to a high quality transmit filter. Powerwave recommends that a 500W average power / 10KW instantaneous peak power rated filter be used in most appli- cations. 3. Connect the combined transceiver output(s) to the RF Input port of subrack. 4. Connect the alarm cable(s) to the alarm port of subrack. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 2-3 September 2001 WARNING Verify that all circuit breaker switches on the power distribution panel are in the OFF position. Turn off external primar…

Text truncated - open the document above for the full version.

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 3-1 September 2001 Section 3 Operating Instructions 3-1 Introduction This section contains operating instructions for the Multicarrier Cellular Amplifier System. 3-2 Location And Function Of Amplifier Module Controls And Indicators Primary +27 Vdc power is applied to the amplifier via a 100-amp circuit breaker (ON-OFF) lo- cated on the left side of the amplifier front panel. The plug-in amplifier module RF control and indicators, located in the center of the amplifier front panel between the cooling fans, are shown in figure 3-1. The status and RF control functions and alarms are described in detail in the subsequent paragraphs. Figure 3-1 G3S-800-140-031 Amplifier Module RF Control and Indicators 3-2.1 Voltage Indicators And On/Off/Reset Switch 3-2.1.1 +27VDC Indicator Green LED. When lit, indicates that the +27 Vdc supply is greater than +21 Vdc and less than +31 Vdc. If the +27 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the +27 Vdc voltage dropped below +21 Vdc. 3-2.1.2 +15VDC Indicator Green LED. When lit, indicates that the +15 Vdc supply is greater than +12 Vdc and less than +17 Vdc. If the +15 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the +15 Vdc voltage dropped below +12 Vdc or increased above +17 Vdc. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 3-2 September 2001 3-2.1.3 +5VDC Indicator Green LED. When lit, indicates that the +5 Vdc supply is greater than +2 Vdc and less than +7 Vdc. If the +5 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the +5 Vdc voltage dropped below +2 Vdc or increased above +7 Vdc. 3-2.1.4 -5VDC Indicator Green LED. When lit, indicates that the -5 Vdc supply is greater than -7 Vdc and less than -2 Vdc. If the -5 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the -5 Vdc voltage dropped below -7 Vdc or increased above -2 Vdc. 3-2.1.5 RF ON Switch Three position switch: Off (down position) - Turns off amplifier module. On (center position) - Normal amplifier on position. Reset (up position) - When toggled to reset position, all the red LED indicators will turn on one at a time in sequence followed by all the green indicators one at a time in sequence; this will also reset the fault latches. If the switch is held in the reset position, a microcontroller reset will occur. This will be verified by the LEDs toggling state again. The switch is spring loaded to return to the normal ON position when released. If a fault occurs and the MCPA is disabled, the alarms can be cleared and the MCPA enabled by this reset position. The func- tions of the switch are disabled for five seconds after a power-up condition. 3-2.2 Alarm Indicators The alarm modes described here are indicative of amplifier alarm modes made to the amplifier subrack. The amplifier subrack interprets these alarms and may subsequently deliver a different alarm indication to the host equipment. Refer to the amplifier subrack manual to determine host equipment level alarms. Refer to section 6 to interpret and correct the various alarm states. Refer to table 3-1. A ‘Minor Alarm’ indicates a potential fatal amplifier problem via the amplifier front panel LEDs. and the MCPA fault will be in evaluation. A ‘Major Alarm’ indicates a major problem but the MCPA module will not be disabled. A ‘Critical Alarm’ is indicative of a fatal problem. The fault indicator will latch on and the MCPA module will be disabled. Both ‘Major Alarm’ and ‘Critical Alarm’ will be sent to the host system via the MCPA subrack. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 3-3 September 2001 Table 3-1 Amplifier Module Alarm Indicators Definition Alarm Mode LED MCPA Module MCPA Disable signal (pin 4 inTable 2-1) Condition Over Pwr Critical Red DisableHigh MCPA module output power >200 watts (Note 4) Over Pwr Critical Red DisableHigh Input power >-2 dBm High Temp Minor Red Enable Low High temperature detected High Temp Critical Red DisableHigh High temperature detected for longer than two minutes VSWR Minor Red Enable Low 14.5 W < Reflected Power < 38W VSWR Critical Red DisableHigh 60W < Reflected power detected at output longer than approx. two min. DC Fail Minor Red Enable Low One of the internal DC voltages dropped below or exceeded the safe threshold level DC Fail Critical Red DisableHigh Voltage out of range for longer than approx. two minutes (Note 2) DC Fail (Over voltage) Critical Red DisableHigh +27 Vdc input >30 V for longer than one sec. after initial detection of DC input >31 V (Note 3) Fan Fail (one) Major Red Enable Low Any fan failure Loop Fail Minor Red Enable Low Loop failure detected Loop Fail Critical Red DisableHigh Loop failure detected longer than 2 minutes Low Pwr Minor Red Enable Low Rack controller detected MCPA out- put is 3 dB below that of the other MCPA in the system. Low Pwr Critical Red DisableHigh Rack controller detected low power condition for more than approx. two minutes LPA DISAB. Critical Red DisableHigh Unit is manually switched off using the front panel RF ON switch, or dis- abled by a serial command or auto shutdown by an alarm condition. NOTES: 1. RS-485 serial alarm will follow LED status. 2. The appropriate status LED shall turn off indicating which voltage is out of its range. 3. When overvoltage is detected: a) MCPA shall shut down (disable) b) Turn on red DC Fail LED c) Set flag for DC Fail alarm 4. When overpower is detected: a) MCPA shall shut down (disable) b) Turn on Over Pwr LED c) Set flag for Over Pwr alarm d) The MCPA module shall use a peak power detector to determine the overpower fault. G3S-800-140-031 In…

Text truncated - open the document above for the full version.

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 4-1 September 2001 Section 4 Principles of Operation 4-1 Introduction This section contains a functional description of the Multicarrier Cellular Amplifier. 4-2 RF Input Signal The maximum input power for all carrier frequencies should not exceed the limits specified in ta- ble 1-2. For proper amplifier loop balance, the out of band components of the input signals should not exceed -40 dBc. The input VSWR should be 2:1 maximum (or better). 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. If the amplifier is operated into a filter, it will maintain its distortion characteristics outside the signal band even if the VSWR is infinite, provided the reflected power does not exceed one watt. A parasitic signal of less than one watt incident on the output will not cause distortion at a higher level than the normal forward distortion (i.e. -60 dBc). 4-4 G3S-800-140-031 Amplifier Module The G3S-800-140-031 amplifier is a linear, feed-forward power amplifier that operates in the 25 MHz frequency band from 851 MHz to 869 MHz. The amplifier modules are designed for parallel operation to achieve high peak power output, and for redundancy in unmanned remote locations. The amplifier module, figure 4-1, has an average output of 140 watts power (1400 watts peak power) with intermodulation products suppressed to better than -60 dBc below carrier levels. The amplifier provides an amplified output signal with constant gain and phase by adding approxi- mately 30 dB of distortion cancellation on the output signal. Constant gain and phase is main- tained by continuously comparing active paths with passive references, and correcting for small variations through the RF feedback controls. All gain and phase variations, for example those due to temperature, are reduced to the passive reference variations. Each amplifier module has an alarm and display board that monitors the amplifier performance. If a failure or fault occurs in an amplifier module, it is displayed on the individual amplifier front panel. The amplifier module is comprised of: Predistorter Pre-amplifiers Main amplifier Error amplifier Two feed-forward loops with phase-shift and gain controls DC/DC power regulator Alarm monitoring, control and display panel The main amplifier employs class AB amplification for maximum efficiency. The error amplifier and feed forward loops are employed to correct signal nonlinearities introduced by the class AB main amplifier. The error amplifier operates in class AB mode. The RF input signals are ampli- fied by a preamp and coupled to an attenuator and phase shifter in the first feed-forward loop. The main signal is phase shifted by 180 degrees and amplified in the premain amplifier. The out- put from the premain amplifier is fed to the class AB main amplifier. The output from the main amplifier is typically 220 watts. The signal is output to several couplers and a delay line. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 4-2 September 2001 The signal output from the main amplifier is sampled using a coupler, and the sample signal is combined with the main input signal and input to the second feed-forward loop. The error signal is attenuated, phase shifted 180 degrees, then fed to the error amplifier where it is amplified to a level identical to the sampled output from the main amplifier. The output from the error amplifier is then coupled back and added to the output from the main amplifier. The control loops continu- ously make adjustments to cancel out any distortion in the final output signals. Pre Amp Pre Main 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 Pre Dist Figure 4-1 G3S-800-140-031 Power Amplifier Module Functional Block Diagram The 2nd loop control section obtains a sample of the distortion added to the output signals by the main amplifiers, phase shifts the signals by 180 degrees, then feeds it to the error amplifier. There it is amplified to the same power level as the input sample and coupled on to the main out- put signal. The final output is monitored by the 2nd loop and adjusted to ensure that the signal distortion and IMD on the final output is canceled out. 4-4.1 Main Amplifier The input and output of the amplifier employ two-stage, class AB amplifiers which provide ap- proximately 32 dB of gain in the 25 MHz frequency band from 851 to 869 MHz. The amplifier op- erates on +27 Vdc, and a bias voltage of +5 Vdc, and is mounted directly on a heat sink that is temperature monitored by a thermostat. If the heat sink temperature exceeds 90° C, a high tem- perature fault occurs. The alarm logic controls the +5 Vdc bias voltage that shuts down the ampli- fier. 4-4.2 Error Amplifier The main function of the error amplifier is to sample and amplify the signal distortion level gener- ated by the main amplifier, to a level that cancels out the distortion and IMD when the error signal is coupled onto the main signal at the amplifier output. The error amplifier is a balanced multi- stage, class AB amplifier, has 51 dB of gain, and produces up to an 80-watt output. The amplifier operates on 27 Vdc and a bias voltage of +5 Vdc, and is mounted directly on a heat sink. 4-4.3 Amplifier Monitoring In the main and error amplifier modules, all normal variations are automatically compensated for by the feedforward loop control. However, when large variations occur beyond the adjustment G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 4-3 Se…

Text truncated - open the document above for the full version.

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 5-1 September 2001 Section 5 Maintenance 5-1 Introduction This section contains periodic maintenance and performance test procedures for the Multicarrier Cellular 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. WARNING Wear proper eye protection to avoid eye injury when using compressed air. Table 5-1 Periodic Maintenance Task Interval Action Cleaning Air Vents 30 Days Inspect and clean per paragraph 5-4 Inspection Cables and Connec- tors 12 Months Inspect signal and power cables for frayed insulation. Check RF connectors to be sure that they are tight. Performance Tests 12 Months Perform annual test per paragraph 5-5. 5-3 Test Equipment Required For Test Test equipment required to test the amplifier system is listed in table 5-2. Equivalent test equip- ment may be substituted for any item, keeping in mind that a thermistor type power meter is re- quired. 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. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 5-2 September 2001 Table 5-2 Test Equipment Required Nomenclature Manufacturer Model Signal Generator RDL IMD-801D-03A 30 dB Attenuator, 500 Watt Weinschel Corp. 53-30-34 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 Network Analyzer H.P. 8753C Current Probe 5-4 Cleaning Air Inlets/Outlets The air inlets and outlets should be cleaned every 30 days. If the equipment is operated in a se- vere dust environment, they should be cleaned more often as necessary. Turn off DC power source before removing fans. If dust and dirt are allowed to accumulate, the cooling efficiency may be diminished. Using either compressed air or a brush with soft bristles, loosen and remove accumulated dust and dirt from the air inlet panels. 5-5 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. NOTE The frequencies used in this test are typical for an amplifier with a 18 MHz band from 851 MHz to 869 MHz. Select evenly spaced F1, F2, F3, and F4 frequencies that cover the instantaneous bandwidth of your system. 5-5.1 Amplifier System Performance Test This test is applicable to the G3S-800-140-031 amplifier modules. To perform the test, proceed as follows: 1. Connect test equipment to the amplifier as shown in figure 5-1. NOTE Do not apply any RF signals at this time. Turn on signal generator and set frequency F1 to 854 MHz, F2 to 857 MHz, F3 to 863 MHz, and F4 to 866 MHz. Adjust each signal generator output so that the sum power output from all four signal generators equals -6 dBm at the input. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 5-3 September 2001 Unit Under Test G3S-800-140-031 Plug-in Amplifier Module +27 Vdc GndRF In RF Out 20 dB Directionl Coupler 30 dB Attenuator 500 W 20 dB Attenuator 20 W Power Meter Sensor Head 8482A 20 dB Att en ua tor 20 W Dir ect ion l Co upl er Power Meter Sensor Head 8482A Network Analyzer 8753C Signal Generator Filter / Isotlator 10 dB Variable Attenuator Spectrum Analyzer 8651E Figure 5-1 Amplifier System Test Setup Diagram 5-5.1.1 Amplifier IMD Test And Current Test 2. Adjust attenuator for an input signal at -10 dBm. Turn on the amplifier by setting RF ON switch of amplifier. Adjust variable attenuator to set amplifier power output on power meter to 140 watts. Measure IMD on spectrum analyzer. IMD should be -60 dBc max. Record test data in table 5-3. Set RF ON switch to OFF. 3. With the amplifier module set at 140 watts power output, use the current probe (magnetic field type) and measure the dc current flow from the +27 Vdc power source. Current should be 70 amps maximum. Record test data in table 5-3. 5-5.1.2 Gain Test 4. Disconnect spectrum analyzer from test setup, and connect the network analyzer. 5. Set network analyzer as follows: ¾ Power output to -10 dBm. ¾ Frequency start to 869 MHz. ¾ Frequency stop to 894 MHz. ¾ Normalize the network analyzer for gain and return loss. 6. Check the gain across the band from 869 MHz to 894 MHz. Gain should be between 58 dB. Record test data in table 5-3. 5-5.1.3 Harmonics Test 7. With the power set at 140 watts power output, use the spectrum analyzer and check the fre- quency band from 851 MHz to 869 MHz for harmonics. Harmonics should be 5 dBm maxi- mum. Record test data in table 5-3. G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 5-4 September 2001 5-5.1.4 Spurious Test 8. With the power amplifier set at 140 watts power output, use the spectrum analyzer and check the frequency band from 851 MHz to 869 MHz for spurious signals. Spurious signals should be -60 dBc maximum. Record test data in table 5-3. 5-5.1.5 Input Return Loss Test …

Text truncated - open the document above for the full version.

G3S-800-140-031 Installation & Service Manual  Copyright Powerwave Technologies, Inc., September 2001. All rights reserved 044-05095 Rev. A 6-1 September 2001 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 Pow- erwave 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 bre…

Text truncated - open the document above for the full version.