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MCA9129-90-A Installation & Service Manual

All specifications are subject to change without notice. Contact the factory for complete performance data.

044-05060 Rev. AC 1-1 July 2001November 2002

Section 1 General Description

1-1 Introduction

This manual contains information and procedures for installation, operation, and maintenance of

Powerwave’s MCA9129-90

MCA9129-90-A multicarrier cellular amplifier. The manual is organ-

ized 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 MCA9129-90MCA9129-90-A (see figure 1-1) is a linear, feed-forward power amplifier that

operates in the 25 MHz frequency band from 869 MHz to 894 MHz. The amplifier can simultane-

ously transmit multiple frequencies, with better than -65 dBc third order intermodulation distortion

(IMD) at 100 watts output, or –60 dBc IMD at 120 watts output. It is designed for use in an ampli-

fier system that is modular in design, and is ideally suited for use in AMPS/TDMA/CDMA base

stations. When used in a subrack employing four MCA9129-90

MCA9129-90-A amplifiers, the

system offers up to 360 watts output at

–65dBc IMD performance level (430 watts output at –60dBc IMD). The plug-in Model MCA9129-

90MCA9129-90-A amplifier modules can each provide 120 watts of power and function com-

pletely 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 sys-

tem'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. Inadvertent operator damage from front panel

manipulation is virtually impossible.

Each 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 three fans, two mounted on the front and one 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 tables 1-2 and 1-3.

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. To that

end, we ask that you, our customer, share with us any information acquired in field situations that

would enhance this manual.

Summary of content (33 pages)

PAGE 1
MCA9129-90-A Installation & Service Manual Section 1 General Description 1-1 Introduction This manual contains information and procedures for installation, operation, and maintenance of Powerwave’s MCA9129-90MCA9129-90-A multicarrier cellular amplifier. The manual is organized into six sections as follows: Section 1. Section 2. Section 3. Section 4. Section 5.
PAGE 2
MCA9129-90-A Installation & Service Manual 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 MCA912990MCA9129-90A 800-01024001800-01779001 800-01025001800-01779002 800-00781-002 Description 100 W 869-894 MHz MCPA Module. Front fan assembly, large. Front Rear fan assembly, small Rear fan assembly.
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MCA9129-90-A Installation & Service Manual Ó Copyright Powerwave Technologies, Inc., July 2001. All rights reserved All specifications are subject to change without notice. Contact the factory for complete performance data. 044-05060 Rev.
PAGE 4
MCA9129-90-A Installation & Service Manual NOTE A quality transmit filter or duplexer must be installed after this amplifier to ensure FCC Type Acceptance of the amplifier. The filter/duplexer should be rated for at least 500 Watts average power and 5000 Watts instaneous power (minimum) when four amplifiers per subrack are installed.
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MCA9129-90-A Installation & Service Manual Figure 1-1 MCA9129-90MCA9129-90-A Amplifier Ó Copyright Powerwave Technologies, Inc., July 2001. All rights reserved All specifications are subject to change without notice. Contact the factory for complete performance data. 044-05060 Rev.
PAGE 6
MCA9129-90-A Installation & Service Manual Section 2 Installation 2-1 Introduction This section contains unpacking, inspection, and installation instructions / recommendations for the model MCA9129-90MCA9129-90-A multicarrier cellular amplifier. It is important that the licensee perform the following tasks correctly and in good faith: 1. Carefully read all material in this section prior to equipment unpacking or installation. 2.
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MCA9129-90-A Installation & Service Manual Table 2-1 Averaged DC Current Load Amplifier Power 100 100 100 100 No. Of Amplifiers 12 8 4 1 3 Sector Averaged Current 378 252 126 31.5 2 Sector Averaged Current 1 Sector Averaged Current 288 144 36 162 40.5 2-4 Air Conditioning Each MCA9129-90MCA9129-90-A amplifier generates 3804 BTUs of heat at full power. A fully populated MCR4109-1 operating at full power will generate 15,217 BTUs of heat.
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MCA9129-90-A Installation & Service Manual 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. 2-6 Installation Instructions (Refer to figures 1-1 and 2-1) The MCA9129-90MCA9129-90-A amplifier module is designed for installation in a subrack that permits access to the rear of the subrack for connection of DC power, RF, and monitor cables.
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MCA9129-90-A Installation & Service Manual 2-7 Multifunction Connector The status, alarm, control, and power connections on the amplifier connectors are made through a 21-pin D-Sub male combo connector and supplemental single-pin male D-Sub connector (figure 2-1) and are listed and described in table 2-3.
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MCA9129-90-A Installation & Service Manual Section 3 Operating Instructions 3-1 Introduction This section contains operating instructions for the Multicarrier Cellular Amplifier. 3-2 Location And Function Of Amplifier Module Controls And Indicators The location and function of the plug-in amplifier module controls and indicators is shown in figure 3-1 and is described in detail in paragraphs 3-3 through 3-3.14. Figure 3-1.
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MCA9129-90-A Installation & Service Manual 3-3.1 27V Indicator (+27VDC) Green LED. When lit, indicates that the +27Vdc supply is greater than +21Vdc and less than +30Vdc. The indicator will blink if the voltage is 28Vdc to 30Vdc. If the voltage source drops below +21V a timer is started and the DC fail counter is incremented. After five seconds the voltage is analyzed, if still faulted the counter is incremented. If the count equals 25 before the timer reaches 15 minutes, the MCPA will enter fault mode.
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MCA9129-90-A Installation & Service Manual 3-3.2 +15V Indicator (+15VDC) Green LED. When lit, indicates that the +15Vdc supply is greater than +14Vdc and less than +16Vdc. If the voltage source varies out of its operating window, a timer is started and the DC fail counter is incremented. After five seconds the voltage is analyzed, if still faulted the counter is incremented. If the count equals 25 before the timer reaches 15 minutes, the MCPA will enter fault mode. Fault mode will disable the MCPA.
PAGE 13
MCA9129-90-A Installation & Service Manual 260 watts. If an over power condition occurs the MCA is immediately disabled. Theand the LPA DISAB indicator will illuminate and the OVER PWR indicator will blink at a 1Hz rate. A timer is started and the over power fault counter is incremented. After five seconds the MCA is enabled and the fault is analyzed. If the fault exists, the MCA is again disabled and the counter is incremented.
PAGE 14
MCA9129-90-A Installation & Service Manual summary alarm and latched indicators. If 15 minutes elapse before the counter reaches five, the counter and timer will reset to zero. 044-05060 Rev. C Ó Copyright Powerwave Technologies, Inc., July 2001.
PAGE 15
MCA9129-90-A Installation & Service Manual 3-3.10 3-3.5 Fan Fail Indicator (FAN FAIL) Red LED. When lit, indicates that either the upper front or rear one or more fans haves failed. The lower front fan is not monitored for failure. If one fan fails, the FAN FAIL indicator will light If the fan speed is below the threshold read at IOC2, 3, 6 or 7, the fan fail alarm LED will be illuminated and a TTL high signal (+5Vdc) will be reported at pin 8 on the back plane connector.
PAGE 16
MCA9129-90-A Installation & Service Manual 3-4 Initial Start-Up And Operating Procedures The only operating controls on each amplifier module are the rocker-style power switch and the RESET switch. WARNING Always turn the amplifier off when disconnecting and reconnecting RF interface cables. Failure to do so may cause damage to the amplifier and/or personal injury. To perform the initial start-up, proceed as follows: 1. Verify that all input and output cables are properly connected.
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MCA9129-90-A Installation & Service Manual 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 table 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).
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MCA9129-90-A Installation & Service Manual Amplifier Subrack Splitter Amplifier Subrack MCA9129-90-A ISO Alarm Sample VVA RF Input ISO ISO Gain Adjust Alarm Form-C Alarms ISO RS-485 Alarm Interface Ctrl 4x Ground MCA9129-90-A Alarm ISO Micro Processor (DC, RF Relay, Alarms) 4x +27VDC MCA9129-90-A C o m b i n e r RF Output MCA9129-90-A Alarm Amplifier Subrack True RMS Amplifier Subrack Splitter MCA9129-90 ISO Alarm Sample VVA RF Input ISO ISO Gain Adjust Alarm Form-C Alarms
PAGE 19
MCA9129-90-A Installation & Service Manual and phase variations, for example those due to temperature, are reduced to the passive reference variations. The amplifier module is comprised of: Preamplifiers 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.
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MCA9129-90-A Installation & Service Manual -40dB 1st Loop Phase & Gain Pre Main Main Amp FWD PWR Pre Amp 2nd Loop Phase & Gain Delay RF Out Delay -40dB -8.
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MCA9129-90-A Installation & Service Manual 4-5.2 Error Amplifier The main function of the error amplifier is to sample and amplify the signal distortion level generated 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 class AB amplifier, has 50 15 dB of gain. The amplifier operates on +27 Vdc and a bias voltage of +15 +12Vdc and is mounted directly on a heat sink. 044-05060 Rev.
PAGE 22
MCA9129-90-A Installation & Service Manual 4-5.3 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 range of the loop control, a loop fault will occur. The alarms are displayed in the front panel indicators and output via a 21-pin connector on the rear of the module to the subrack summary board for subsequent remote monitoring. 4-5.
PAGE 23
MCA9129-90MCA9129-90-A Installation & Service Manual 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.
PAGE 24
MCA9129-90MCA9129-90-A Installation & Service Manual Table 5-2 Test Equipment Required Nomenclature Signal Generator (4 each) 20 dB Attenuator, 250 500 Watt 20 dB Attenuator, 20 Watt (2 each) Spectrum Analyzer Coax Directional Coupler Power Meter / Sensor Variable Attenuator Four Tone Combiner Network Analyzer Current Probe Manufacturer H.P.RDL Tenuline Weinschel Tenuline H.P. H.P. H.P. Model 8656BIMD-801D-03A WA53-20-34 8560E 778D 437B / 8481A H.P.
PAGE 25
MCA9129-90MCA9129-90-A Installation & Service Manual just variable attenuator to set amplifier power output on power meter to 90 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc max. Record test data in table 5-3. Switch tested amplifier to OFF. 4. Repeat step 3 for amplifiers 2, 3, and 4, as applicable, for each plug-in amplifier module. 5-5.1.2 Two Amplifier IMD Test 5. Reset and turn on channel 1 and 2 amplifier modules, and turn off channel 3 and 4 amplifiers.
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MCA9129-90MCA9129-90-A Installation & Service Manual 5-5.1.5 Harmonics Test 17. With the power amplifier set at 360 watts power output, use the spectrum analyzer and check the frequency band from 869 MHz to 894 MHz for harmonics. Harmonics should be -50 dBc maximum. Record test data in table 5-3. 5-5.1.6 Spurious Test 18. With the power amplifier set at 360 watts power output, use the spectrum analyzer and check the frequency band from 869 MHz to 894 MHz for spurious signals.
PAGE 27
MCA9129-90MCA9129-90-A Installation & Service Manual Figure 5-1 Amplifier System Test Setup Diagram 044-05060 Rev. C Ó Copyright Powerwave Technologies, Inc., July 2001.
PAGE 28
MCA9129-90MCA9129-90-A Installation & Service Manual Table 5-3 Multicarrier Cellular Amplifier Test Data Sheet DATE _________________________________ MODULE #1 S/N ________________________ MODULE #2 S/N ________________________ MODULE #3 S/N ________________________ MODULE #4 S/N ________________________ TEST CONDITIONS: Load and Source Impedance: 50 Ohms VSWR: < 1.2:1 Supply Voltage: +27 Vdc ±0.1 Vdc TEST SPECIFICATION 4 8-TONE IMD One Module Vcc = 27 Vdc PO = 90 W Freq.
PAGE 29
MCA9129-90MCA9129-90-A Installation & Service Manual 5-6 Field Replaceable Parts And Modules The following parts and modules can be replaced in the field on site by a qualified technician with experience maintaining RF power amplifiers and similar equipment: 1. MCA9129-90MCA9129-90-A Power Amplifier Modules 2. Cooling Fans 5-6.1 MCA9129-90MCA9129-90-A Power Amplifier Module To replace a power amplifier module, proceed as follows: 1.
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MCA9129-90MCA9129-90-A 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 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.
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MCA9129-90MCA9129-90-A Installation & Service Manual 2. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA DisableStatus LED is not illuminated, then the input RF power level is too high. The amplifier subrack is attempting to maintain a safe power output level (smart subracks with True RMS power detectors and voltage variable attenuators only). This may be validated by checking the APC LED on the subrack for a blinking state.
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MCA9129-90MCA9129-90-A Installation & Service Manual the outer connector shield is not damaged. When installing the amplifier, do not force the amplifier into the slot. Gentle even pressure is all that is needed to properly seat the amplifier. B. Improper seating of the amplifier. 1. Ensure the amplifier thumbscrews are properly tightened. 2. Try seating the amplifier in another subrack slot. 3. Try seating the amplifier in a subrack in another sector. 6-2.
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MCA9129-90MCA9129-90-A Installation & Service Manual A. An accompanied alarm indicating a critical amplifier fault (i.e. Loop Fail fault). Such as: · Loop Fail · DC Fail · Input Overdrive · Low Power · Error Amp Over Current For the alarm conditions above, the DB-9 connector on the front panel must be interfaced via RS-232 with a PC to determine exact cause for shutdown.