Powerwave Technologies 5JS0063 User Manual

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 MCA9129-90 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 simultaneously 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 amplifier 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 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 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. Inadvertent operator damage from front panel manipulation is virtually impossible.

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

MCA9129-90-A amplifiers, the

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 indicators 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, including 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.

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

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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

MCA912990MCA9129-90A 800-01024001800-01779001 800-01025001800-01779002 800-00781-002 Rear fan assembly.

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.

100 W 869-894 MHz MCPA Module.

Front fan assembly, large.

Front Rear fan assembly, small

NOTE

Table 1-2 MCA9129-90

MCA9129-90-A Multicarrier Cellular Amplifier Functional

Specifications, 100 Watts

Frequency Range 869-894 MHz (25 MHz Bandwidth) Total Maximum Input Power -12 dBm Total Output Power 100 W typical (1 Module) BTUs @ 100 W 3813 Intermodulation Distortion

and In-Band Spurious:

-65 dBc (Min) @ +24 +26 to +28 Vdc @ 100 Watts

(-55 dBc (Min) @ +23 to + 24 Vdc)

RF Gain at 880 MHz 62 dB Gain Flatness: Gain Variation Over Temperature:

± 0.7 dB @ 27 Vdc ±1 Vdc

±0.3 dB from 23 to 30 Vdc

Output Protection: Mismatch Protected Input Port Return Loss: -14 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, 45

36 Amps Max @ 100 Watts

Operational +21 Vdc to 30 Vdc Operating Temperature: 0 ºC. to +50 ºC. Storage Temperature: -40 ºC. to +85 ºC. Operating Humidity: 5 % - 95 % Relative Humidity (Noncondensing) Storage Humidity: 5 % - 95 % 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. Weight 45 pounds Dimensions: 15.72” (9U) High, 5.50” Wide, 17.1116.75” Deep

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

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

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NOTE

Table 1-3 MCA9129-90

MCA9129-90-A Multicarrier Cellular Amplifier (FCC Tested @ 120

Watts)

Frequency Range 869-894 MHz (25 MHz Bandwidth) Total Maximum Input Power -11 -11.2dBm Total Output Power 120 W typical (1 Module) BTUs @ 120 W 4381 Intermodulation Distortion

and In-Band Spurious:

-60 dBc (MinMax) @ +24 +26 to +28 Vdc @ 120 Watts

(-55 dBc (Min) @ +23 to + 24 Vdc)

RF Gain at 880 MHz 62 dB Gain Flatness: Gain Variation Over Temperature:

± 0.7 dB @ 27 Vdc ±1 Vdc

±0.3 dB from 23 to 30 Vdc

Output Protection: Mismatch Protected Input Port Return Loss: -14 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, 52

40 Amps Max @ 120 Watts

Operational +21 Vdc to 30 Vdc Operating Temperature: 5 0ºC. to +40 ºC. Storage Temperature: -40 ºC. to +85 ºC. Operating Humidity: 5 % - 95 % Relative Humidity (Noncondensing) Storage Humidity: 5 % - 95 % 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. Weight 45 pounds Dimensions: 15.72” (9U) High, 5.50” Wide, 17.1116.75” Deep

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

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Figure 1-1 MCA9129-90MCA9129-90-A Amplifier

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

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Section 2 Installation

2-1 Introduction

This section contains unpacking, inspection, and installation instructions / recommendations for the model MCA9129-90 censee perform the following tasks correctly and in good faith:

1. Carefully read all material in this section prior to equipment unpacking or installation.

2. Also, read and review the operating procedures in Section 3 prior to installing the equipment.

3. 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 Site Survey

Powerwave Technologies recommends that site surveys be performed by qualified individuals or firms prior to equipment ordering or installation. Performing a detailed site survey will reduce or eliminate installation and turn-up delays caused by oversights. A general site survey form is provided in Appendix A. This form is commonly used by Powerwave Field Engineers and may be used as a guide. Pay particular attention to power plant capacity, air conditioning needs, floor space, and RF/DC cabling/breaker requirements.

MCA9129-90-A multicarrier cellular amplifier. It is important that the li-

2-3 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 (70-amp minimum), so a failure in one does not shut off the whole installation. Circuit breakers should be thermal type, capable of handling the anticipated inrush current, in a load center with a master switch. See table 2-1.

A typical three-sector site will utilize three MCR4109-1 amplifier subracks, each housing up to four

MCA9129-90 432 amps of current required by this equipment, plus the remaining base station equipment. A

power plant of less than 800 amps is probably not sufficient. Since all the amplifiers are not running at full capacity at the same time in normal operation, table 2-1 describes the current load for a 3 sector (70%), 2 sector (80%) and omni (90%) site. Based on this table, an 800 amp power plant may suffice.

Battery backup or UPS systems should be installed in remote sites or in sites which experience brownout conditions or generator switchovers. Adding this equipment should eliminate the need for site visits by technicians after brownouts or power outages. Battery backup systems also provide excellent DC filtering as a side benefit.

MCA9129-90-A amplifiers. The power plant should be able to support the 540 amps

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Table 2-1 Averaged DC Current Load

Amplifier

Power

100 12 378 100 8 252 288 100 4 126 144 162 100 1 31.5 36 40.5

No. Of

Amplifiers

3 Sector

Averaged Current

2 Sector

Averaged Current

1 Sector

Averaged Current

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. A full threesector site employing three fully populated MCR4109-1 subracks will generate 45,652 BTUs of heat at full power (360W per subrack). A five-ton air conditioner is needed to cool this Powerwave 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 describes 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.

Table 2-2 Averaged Heat Loading

Amplifier

Power

100 12 31,956.8 100 8 21,304.5 24,348.0 100 4 10,652.3 12,174.0 13,695.8 100 1 2,663.1 3,043.5 3,423.9

No. Of

Amplifiers

3 Sector Averaged

BTU's

2 Sector Averaged

BTU's

1 Sector Aver-

aged BTU's

2-5 Unpacking and Inspection

This equipment has been operated, tested, and calibrated at the factory. Only in the event of severe shocks or other mistreatment should any substantial readjustment be required. Carefully unpack each piece of equipment after it has reached the installation site and is approximately in place. Carefully open the several amplifier system containers and remove the subracks, amplifier modules, input combiners, and miscellaneous interconnect cables and hardware. 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 cabinet and all modules for damage that may have occurred during shipment. Check for evidence of water damage, bent or warped chassis, loose screws or nuts, or extraneous packing material in the connectors or fans. Inspect male connectors on modules and harnesses for bent connector 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. Powerwave may not accept returns without a return authorization. Claims

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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.

To install the amplifier proceed as follows:

1. Install the amplifier subrack in the equipment rack and secure in place based the subrack

installation manual instructions.

2. Connect the antenna cable to the output of the subrack.

3. Connect the transceiver output(s) to the input of the subrack. Refer to tables 1-1 and 1-2 for

proper RF input levels.

4. Connect the alarm cable(s) to the subrack.

WARNING

Verify that all circuit breaker switches supplying power to the subrack are in the OFF position. Turn off external primary DC power before connecting DC power cables.

5. Connect positive primary power and negative primary power to the subrack. Tighten the

subrack power connections.

WARNING

Do not slam amplifiers into the subracks. Forcing the amplifier into the subrack at too fast a rate may cause the pins on the 21-pin D-sub connector of the amplifier to become recessed or broken. The use of too much force while installing the amplifier may also cause the splitter / combiner module of the MCR4109-1 to become poorly aligned resulting in the inoperation of an amplifier installed in one of the two outer slots.

6. Inspect the 21-pin D-sub connector on the rear of each amplifier before inserting it into the

subrack. Verify that all pins are straight, no pins are recessed, and the alignment shield is not bent. At the front of the subrack, install the plug-in amplifier modules.

7. After verifying that the front panel power ON / OFF switch is in the OFF position, gently install

the plug-in amplifier modules in the subrack. Tighten top and bottom thumbscrews until they are finger tight. Use a slotted screwdriver to tighten the thumbscrews an 1/8 past finger tight.

8. Check your work before applying DC voltage to the system. Make certain all connections are

tight and correct.

9. Measure primary DC input voltage. DC input voltage should be +27 Vdc ±1.0 Vdc. If the DC

input voltage is above or below the limits, call and consult Powerwave before you turn on your amplifier system.

to a 1/4 turn

10. Refer to section 3 for initial turn-on and checkout procedures.

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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.

Figure 2-1 Amplifier Connectors (on Rear of MCA9129-90MCA9129-90-A Module)

Table 2-3 Amplifier Module Status, Alarm, Control, and Power Connections

Pin Function Description

21-Pin D-Sub Male Combo

A1 RF Input Coaxial Contact A2 Power Input +27 Vdc (Power Contact) A3 Ground Ground (Power Contact) A4 RF Output Coaxial Contact

1 Ground Ground 2 RS 485 +RxD Serial Communication Data In 3

RS 485 -RxD 4 RS 485 +TxD Serial Communication Data Out 5

RS 485 -TxD 6NA 7NA 8 Fan Fail TTL signal normally low. A high indicates one or bothof the fans have

9 Forward Power Monitor An analog DC signal representing the RF output power of the MCA. The

10 NA 11 Average Power Input An analog DC voltage representing the average detected power of all

12 Address A0 Amp Address A0; Ground for high, float for low 13 Summary Fault TTL signal normally low. A high level indicates that the MCA has been

14 Address A1 Amp Address A1; Ground for high, float for low 15 Module Detect Ground potential. Informs the subrack that an MCA is plugged in. 16

17 FP Disable Output TTL signal, low if the front panel switch is in the ON position. A high

Bias InputNA TTL signal normally low for an enabled MCPA. A high level will

Single-Pin D-Sub Male

1 Power Input +27 Vdc (Power Contact)

Serial Communication Data In

Serial Communication Data Out

failed

voltage is 4 volts ± 100 mV at the maximum rated output power.

the MCAs in a subrack. This voltage is derived from dividing the sum of all the forward power voltages in a subrack by the number of enabled MCAs. This voltage is used by the MCA to determine a low power fault.

disabled by a recurring alarm fault.

disable the MCPA.

level indicates the front panel switch in the OFF position.

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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. MCA9129-90 Amplifier Module Controls and Indicators

3-3 Controls And Indicators

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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. Fault mode will disable the MCPA. The +27V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero. If the DC input voltage exceeds +30 volts, the MCA will be disabled instantaneously, as indicated by the illumination of the LPA DISAB indicator. The +27V and DC FAIL indicators will alternatively blink at a 1Hz rate. A timer is started and the DC fail counter is incremented. After five seconds the voltage is measured. If the fault exists the counter is incremented. If the count equals five before the timer reaches 15 minutes, the MCPA will enter fault mode. The +27V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches five, the counter and timer will reset to zero.

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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. The +15V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.3 +5V Indicator (+5VDC)

Green LED. When lit, indicates that the +5Vdc supply is greater than +4.5Vdc and less than +5.5Vdc. 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. The +5V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.4 –5V Indicator (–5VDC)

Green LED. When lit, indicates that the -5Vdc supply is greater than -5.5Vdc and less than -

4.5Vdc. 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. The -5V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.5 3-3.1 RESET Switch

Three position switch:

Down Position – Has no ef

Center Position - Normal amplifier on position.

RESET (up position) - When toggled to reset position, all the green off and all the red Status LED indicators will illuminate momentarily (LED test); this will also reset the fault latches. Then a series of fault LEDs will illuminate for 2 seconds to illustrate

configuration type. 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 MCA is disabled, the alarms can be cleared and the MCA enabled by this reset position. The functions of the switch are disabled for five seconds after a power-up condition.

fect Disabled.

LED indicators will turn

3-3.6 3-3.2 Over Power Indicator (OVER PWR)

Red LED. When blinking,illuminated, indicates the output power from the amplifier has ex- ceedeedd 120 52dBmwatts. When lit, indicates the output power from the amplifier exceeded

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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. If the count equals five before the timer reaches 15 minutes, the MCPA will enter fault mode. Fault mode will disable the MCPA. The OVER PWR and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches five, the counter and timer will reset to zero.

3-3.7 3-3.3 High Temperature Indicator (HIGH TEMP)

Red LED. When lit, indicates that the main amplifier heat sinkbase plate temperature has ex- ceeded 750 °C. If a high temperature condition occurs a timer is started and the high temperature fault counter is incremented. After five seconds the fault is analyzed. If the fault exists, the counter is incremented. If the count equals 25 before the timer reaches 15 minutes or if the base

temperature exceeds 85 °C, the MCPA will enter fault mode. Fault mode will disable the MCPA.

The HIGH TEMP and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched

perature drops below 65 °C, the amplifier will recover to the original enabled state and the alarm condition will be cleared. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter

and timer will reset to zero.

If the tem-

3-3.8 3-3.4 VSWR Indicator (VSWR)

Red LED. When lit, indicates that the reflected power detected at the amplifier output exceeds 70

46.5 dBmwatts. If a VSWR condition occurs a timer is started and the VSWR fault counter is in-

cremented. After five seconds the fault is analyzed. If the fault exists, the counter is incremented. If the count equals 25 before the timer reaches 15 minutes or if the reflected power level exceeds

150W, the MCPA will enter fault mode. Fault mode will disable the MCPA. The VSWR and LPA

DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.9 DC Fail Indicator (DC FAIL)

Red LED. When lit, indicates that one of the internal DC voltages dropped below or exceeded the safe threshold level (+21 V<+27 V<+30 V, +14 V<+15 V<+16 V, +4.5 V<+5 V<+5.5 V, or

-5.5 V<-5 V<-4.5 V). If a DC fail condition occurs a timer is started and the DC fail counter is incremented. After five seconds the fault is analyzed. If the fault exists, 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. The green indicator representing the invalid voltage will turn-off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero. If the DC input voltage exceeds +30 volts, the MCA will be disabled instantaneously, as indicated by the illumination of the LPA DISAB indicator. The +27V and DC FAIL indicators will alternatively blink at a 1Hz rate. A timer is started and the DC fail counter is incremented. After five seconds the voltage

is measured. If the fault exists the counter is incremented. If the count equals five before the timer reaches 15 minutes, the MCPA will enter fault mode. The +27V indicator will turn off, the DC FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. Toggling the reset switch will enable the MCPA and clear the

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summary alarm and latched indicators. If 15 minutes elapse before the counter reaches five, the counter and timer will reset to zero.

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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. Fain failure will not trigger a summary fault condition. . If both fans fail, the FAN FAIL indicator will light, a timer is started, and the fan fail counter is incremented. After five seconds the fault is analyzed. If the fault exists, 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. The FAN FAIL and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero. Indicator is applicable to the large front and rear fans, not to the small front fan.

Loop Indicator (LOOP FAIL)

Red LED. When lit, indicates that one of the loop control voltages has transitioned above or below safe operating limits. If a loop fail condition occurs a timer is started and the loop fail counter is incremented. After five seconds the fault is analyzed. If the fault exists, 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. The LOOP and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.12 Low Power Indicator (LOW PWR)

Red LED. When lit, indicates that the RF power output from the amplifier dropped -2dB (-1, +0dB) below the average power output of all amplifier modules in the rack. If a low power condition occurs a timer is started and the low power fault counter is incremented. After five seconds the fault is analyzed. If the fault exists, 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. The LOW PWR and LPA DISAB indicators will illuminate and a summary fault will occur signaling the shelf that the MCPA is disabled. In fault mode the LED indications are latched. Toggling the reset switch will enable the MCPA and clear the summary alarm and latched indicators. If 15 minutes elapse before the counter reaches 25, the counter and timer will reset to zero.

3-3.13 3-3.6 LPA Disable Indicator (LPA DISAB.) STATUS Indicator

Green/Red LED. When lit, indicates that the MCPA was disabled due to an internal fault or by positioning the disable switch in the down position. or by the shelf performing the sleep mode function. If a fault indicator does not accompany the LA DISAB indicator, the sleep mode function is active.The status LED is green under normal operating conditions.

3.3.7 Power Circuit Breaker (OFF / ON)

Rocker style circuit breaker, which controls DC power to amplifier. The circuit breaker is rated for 100 amps, with amplifier thermal impact considered.

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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.

CAUTION

Before applying power, make sure that the input and output of the amplifier are properly terminated at 50 ohms. Do not operate the amplifier without a load attached. Refer to tables 1-1and 1-2 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 coaxial cable. Use of any other cable, will distort the output.

2. Verify that the amplifier’s front panel power rocker switch is in the OFF position.

3. Turn on the power supply that provides +27 Vdc to the amplifier system. Do not apply an RF signal to the amplifier system.

4. Set the amplifier’s front panel power rocker switch to the ON position.

5. Visually check the indicators on each amplifier module, and verify that the following indicators are as follows:

A. LPA D

B. The +27VDC, +15VDC, +5VDC and -5VDC indicators (green) on all amplifier modules

6. Follow the power setting procedure set forth in the amplifier subrack or system integration manual. Turn on external exciter/transceiver and apply RF input signals.

ISAB. Indicator (red) should turn off after 2.5 seconds. Status indicator should il-

luminate green immidiately upon startup.

should be on. The VSWR, Over Power, High Temp and Fan Fail LEDs should be off.

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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).

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. -65 dBc).

4-4 System Functional Description

The MCA9129-90MCA9129-90-A amplifier is a linear, feed-forward power amplifier that operates in the 25 MHz frequency band from 869 MHz to 894 MHz. A typical four-module system is shown in figure 4-1. The power output specification is listed in table 1-2. Each amplifier is a selfcontained plug-in module and is functionally independent of the other amplifier modules. The amplifier modules are designed for parallel operation to achieve high peak power output, and for redundancy in unmanned remote locations. Each amplifier in the system can simultaneously transmit multiple carrier frequencies, at an average total power output of 90 watts (1 amplifier module in a subrack unit) to 360 watts (4 amplifier modules), with -65 dBc third order intermodulation distortion (IMD). Each amplifier in the system has been FCC tested to simultaneously transmit multiple carrier frequencies, at an average total power output of 108 watts (1 amplifier module in a subrack unit) to 430 watts (4 amplifier modules), with -60 dBc third order intermodulation distortion (IMD). Refer to the MCR4109-1 subrack installation and service manual (044-05061) for complete system level power and IMD specifications.

The output from each amplifier is an amplified composite signal of approximately 100 watts at –65dBc IMD (120 watts at –60dBc IMD) before combiner losses. All phase and gain corrections are performed on the signal(s) in the individual amplifier modules. In a four -module system, the amplifier outputs are fed to a power combiner and combined to form a composite RF output of up to 360 watts at –65dBc IMD (430 watts at –60dBc IMD). 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.

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RF Input

Form-C Alarms

RS-485 Alarm

4x +27VDC

4x Ground

Gain Adjust

Interface

Amplifier Subrack Amplifier

Splitter

MCA9129-90-A

ISO

VVA

ISO

Ctrl

Micro

(DC,

Alarms)

Processor

RF Relay,

Amplifier Subrack Amplifier

ISO

Splitter

Alarm

MCA9129-90-A

Alarm

MCA9129-90-A

Alarm

MCA9129-90-A

Alarm

Subrack

i n e

Subrack

True RMS

Sample

RF Output

MCA9129-90

RF Input

Gain Adjust

Form-C Alarms

RS-485 Alarm

Interface

4x +27VDC

4x Ground

ISO

Micro

Processor

(DC,

RF Relay,

Alarms)

ISO

VVA

ISO

Ctrl

ISO

Alarm

MCA9129-90

Alarm

Sample

i n e r

RMS

RF Output

True

Figure 4-1 MCA9129-90MCA9129-90-A Four Module Amplifier System

4-5 MCA9129-90MCA9129-90-A Amplifier Module

The amplifier module, figure 4-2, has an average output of 120 watts power (1200 watts peak

power) with intermodulation products suppressed to better than -65 dBc below carrier levels at

100 watts output, -60 dBc at 120 watts output. The amplifier provides an amplified output signal with constant gain and phase by adding approximately 30 dB of distortion cancellation on the output signal. Constant gain and phase is maintained by continuously comparing active paths with passive references, and correcting for small variations through the RF feedback controls. All gain

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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. 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 amplified 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 output from the premain amplifier is fed to the class AB main amplifier. The output from the main amplifier is typically 120

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 continuously make adjustments to cancel out any distortion in the final output signals.

140 watts. The signal is output to several couplers and a delay linefilter.

The primary function of the first loop is to provide an error signal for the second loop. The primary function of the second loop is to amplify the error signal to cancel out spurious products developed in the main amplifier. The input signal is amplified by a preamplifier and fed to a coupler and delay line. The signal from the coupler is fed to the attenuator and phase shifter in the 1st loop. The first loop control section phase shifts the main input signals by 180 degrees and constantly monitors the output for correct phase and gain.

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-40dB

1st Loop

Phase & Gain

Pre Main

Main

FWD PWR

-40dB

Delay

-8.5dB

RF Out

RFL PWR

Pre

Pre Amp

+15 +5 -5

Power Supply

Phase & Gain

Delay

Feed Forward Loop control

+27VDC

Smart Rack

1st Loop

Delay

Feed Forward Loop control

Pre Main

2nd Loop

Phase & Gain

larms & Display

Main Amp

FWD PWR

2nd Loop

Phase & Gain

Error

Error Amp

Front Panel

-40dB

-30dB

Delay

-10dB

RF Out

RFL PWR

+15 +5 -5

Power Supply

+27VDC

Smart Rack

Alarms & Display

Front Panel

Figure 4-2 MCA9129-90MCA9129-90-A 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 output 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.

4-5.1 Main Amplifier

The input and output of the amplifier employ three-stage, class AB amplifiers which provide approximately 30 plifier operates on +27 Vdc, and a bias voltage of +5 +12 Vdc, and is mounted directly on a heat sink which is temperature monitored by a digital thermostat IC. If the heat sink temperature exceeds 92 85 °C, the thermostat opens and a high temperature fault occurs. The alarm logic controls the +5 12 Vdc bias voltage that shuts down the amplifier.

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15 dB of gain in the 25 MHz frequency band from 869 MHz to 894 MHz. The am-

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.

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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.

4-5.4 Amplifier Module Cooling

Although each amplifier module contains its own heat sink, It is cooled with forced air. Three fans for are used for forced air cooling and redundancy. The fans are located on the front and rear of the amplifier module, draw air in through the rear of the amplifier, and exhaust hot air out the front of the module. The lower front fan is not monitored for failure as are the other two. field replaceable (refer to paragraph 5-6.2).

The fans are

4-6 Power Distribution

Primary DC power for the system is provided by the host system to the subrack. The subrack supplies each amplifier module with +27 Vdc directly and via the RF power splitter/combiner. The amplifier module has linear and switching regulators that generates required DC voltages such as

a DC/DC converter that converts the +27 Vdc to +15 Vdc, +5 Vdc, +9V and -5 Vdc from +27Vdc.

4-7 Intermodulation

The MCA9129-90MCA9129-90-A amplifier is designed to deliver a 120-watt composite average analog power, multicarrier signal, occupying a bandwidth less than or equal to 25 MHz, in the bandwidth from 869-894 MHz. The maximum average power for linear operation, and thus the amplifier efficiency, will depend on the type of signal amplified.

4-7.1 Two-Tone Intermodulation

When measured with two equal CW tones spaced anywhere from 30 kHz to 25 MHz apart, and at any power level up to the peak power, the third order intermodulation products will be below

-65 dBc at 100 watts output, below –60 dBc at 120 watts output.

4-7.2 Multitone Intermodulation

Adding more tones to the signal will lower individual intermodulation products. If the frequencies are not equally spaced, the level of intermodulation products gets very low. When the frequencies are equally spaced, those products fall on top of each other on the same frequency grid. The average power of all intermodulation beats falling on the same frequency is called the composite intermodulation; it is -65 dBc @ 100 W output, -60 dBc @ 120 W output, or better, with a maximum of one MHz channel spacing.

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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 Connectors

Performance Tests 12

Months

Inspect signal and power cables for frayed insulation. Check RF connectors to be sure that they are tight.

Perform annual tests in accordance with individual manuals for amplifiers.

5-3 Test Equipment Required For Test

Test equipment required to test the amplifier system is listed in Table 5-2. Equivalent test equipment may be substituted for any item, keeping in mind that a thermistor type power meter is required.

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.

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Table 5-2 Test Equipment Required

Nomenclature Manufacturer Model

Signal Generator (4 each) H.P.RDL 8656BIMD-801D-03A 20 dB Attenuator, 250 500 Watt Tenuline Weinschel WA53-20-34 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

Variable Attenuator Four Tone Combiner

Network Analyzer H.P. 8753C8753ES Current Probe Agilent 1146A

5-4 Cleaning Air Inlets/Outlets

The air inlets and outlets should be cleaned every 30 days. If the equipment is operated in a severe dust environment, they should be cleaned more often as necessary. Turn off DC power source before cleaning 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 25-MHz band from 869 MHz to 894 MHz. Select evenly spaced F1, F2, F3, and F4 frequencies, that cover the instantaneous bandwidth of your system.

5-5.1 Amplifier Performance Test

This test is applicable to a subrack equipped with one to four plug-in MCA9129-90MCA9129-90-A amplifier modules. Perform the tests applicable to your system. To perform the test, proceed as follows:

1. Connect test equipment to the subrack as shown in figure 5-1.

NOTE

Do not apply any RF signals at this time.

2. Turn on all four signal generators and set frequency F1

and 887 MHz., F2 to 881 MHz, F3 to 882 MHz, and F4 to 883 MHz. Adjust each signal gen-

erator output so that the composite power equals –12dBm.sum power output from all four

signal generators equals -4 dBm at the output of the 4-way combiner.

to 880, 881, 882, 883, 884, 885, 886

5-5.1.1 Single Amplifier IMD Test

3. Adjust attenuator for an input signal at –l2 -12dBm. Reset channel 1 amplifier with the front panel ON/OFF/RESET switch, and set switch to ON. Set amplifiers 2, 3, and 4 to OFF. Ad-

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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. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

6. Reset and turn on channel 1 and 3 amplifiers, and turn off channel 2. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

7. Reset and turn on channel 1 and 4 amplifiers and turn off channel 3. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

8. Reset and turn on channel 2 and 3 amplifiers, and turn off channel 1. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

9. Reset and turn on channel 2 and 4 amplifiers, and turn off channel 3. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

10. Reset and turn on channel 3 and 4 amplifiers, and turn off channel 2. Adjust the variable attenuator to set power output on power meter to 180 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

5-5.1.3 Three Amplifier IMD Test

11. Reset and turn on channel 1, 2 and 3 amplifiers, and turn off channel 4. Adjust the variable attenuator to set power output on power meter to 270 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

12. Reset and turn on channel 1, 2 and 4 amplifiers, and turn off channel 3. Adjust the variable attenuator to set power output on power meter to 270 watts. . Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

13. Reset and turn on channel 1, 3 and 4 amplifiers, and turn off channel 2. Adjust the variable attenuator to set power output on power meter to 270 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

14. Reset and turn on channel 2, 3 and 4 amplifiers, and turn off channel 1. Adjust the variable attenuator to set power output on power meter to 270 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

5-5.1.4 Four Amplifier IMD And Current Test

15. Reset and turn on channel 1, 2, 3, and 4 amplifiers. Adjust the variable attenuator to set power output on power meter to 360 watts. Measure IMD on spectrum analyzer. IMD should be -65 dBc maximum. Record test data in table 5-3.

16. With the power amplifier set at 360 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

180 144 amps maximum. Record test data in table 5-3.

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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. Spurious signals should be -65 dBc maximum. Record test data in table 5-3.

5-5.1.7 Gain Test

19. Disconnect spectrum analyzer from test setup, and connect the network analyzer.

20. Set network analyzer as follows:

A. Power output to -

–4 -12 dBm.

B. Frequency start to 869 MHz.

C. Frequency stop to 894 MHz.

D. Normalize the network analyzer for gain and return loss.

21. Reset and turn on the channel 1 amplifier, turn off channel 2, 3 and 4 amplifiers. Check the gain across the band from 869 MHz to 894 MHz. Gain should be as specified in table 1-2 ±1 dB. Record test data in table 5-3.

22. Turn off the channel 1 amplifier and reset and turn on the channel 2 amplifier. Check the gain across the band from 869 MHz to 894 MHz. Gain should be as specified in table 1-2 ±1 dB. Record test data in table 5-3.

23. Repeat steps 21 and 22 and individually check and record the gain of each amplifier module in the system. Record test data in table 5-3.

24. Refer to table 5-3. Collectively reset and turn on the amplifier modules in groups of two three and four, as shown in table 5-3, and check the gain of each group. The minimum/maximum gain of each group of amplifiers should be within the limits shown in table 5-3. Record test data in table 5-3.

5-5.1.8 Input Return Loss Test

25. Reset and turn on all amplifier modules in the main frame. Read and record the S loss measurement on network analyzer. Record test data in table 5-3.

return

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MCA9129-90MCA9129-90-A Installation & Service Manual

Figure 5-1 Amplifier System Test Setup Diagram

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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 MIN MAX DATA

4 8-TONE IMD

One Module

4 8 -TONE

IMD Two Modules

4 8 -TONE

IMD Three Modules

4 8 -TONE

IMD Four Modules

RF Gain One Module

RF Gain Two Modules

RF Gain Three Modules

RF Gain Four Modules

Harmonics Vcc = 27 Vdc

Spurious Vcc = 27 Vdc

Gain Flatness Vcc = 27 Vdc

Input Return Loss

DC Power Vcc = 27 Vdc

Vcc = 27 Vdc PO = 90 W Freq.: 880, 881, 882, 883 MHz Vcc = 27 Vdc PO = 180 W Freq.: 880, 881, 882, 883 MHz Vcc = 27 Vdc PO = 270 W Freq.: 880, 881, 882, 883 MHz Vcc = 27 Vdc PO = 360 W Freq.: 880, 881, 882, 883 MHz Vcc = 27 Vdc PO = 90 W Freq. = 880 MHz Vcc = 27 Vdc PO = 180 W Freq. = 880 MHz Vcc = 27 Vdc PO = 270 W Freq. = 880 MHz Vcc = 27 Vdc PO = 360 W Freq. = 880 MHz

PO = 360 W 869 - 894 MHz Band

PO =360 W 869 - 894 MHz Band

PO =360 W 869 - 894 MHz Band Vcc = 27 Vdc PO = 360 W 869-894 MHz Band

PO = 360 W

8 Tones

- 887

Table 1-2

-1 dB

Table 1-2

-1 dB

Table 1-2

-1 dB

Table 1-2

-1 dB

-18 dB All

-65 dBc1234

-65 dBc 1,2 1,3 1,4 2,3 2,4 3,4

-65 dBc 1,2,3 1,2,4 1,3,4 2,3,4

-65 dBc All

Table 1-2 +1 dB

-50 dBc All

-65 dBc All

±0.7 dB All

180 144

Amps

1234

1,2 1,3 1,4 2,3 2,4 3,4

1,2,3 1,2,4 1,3,4 2,3,4

All

PASS ___________________________________ FAIL ___________________________________

Tested by ________________________________

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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. MCA9129-90

2. Cooling Fans

MCA9129-90-A Power Amplifier Modules

5-6.1 MCA9129-90MCA9129-90-A Power Amplifier Module

To replace a power amplifier module, proceed as follows:

1. Set ON/OFF/RESET switch on the front panel of the amplifier module to OFF.

2. Loosen two screws that secure amplifier module to subrack.

CAUTION

When removing the amplifier from the subrack, it is very important to support the amplifier such that the rear of the module does not suddenly drop when the guide rail disengages from the track. A drop such as this could damage the rear multipin connector.

3. With steady even pressure, use handle on front of amplifier to pull module out of subrack.

5-6.2 Cooling Fans

To replace a cooling fan, proceed as follows:

1. Remove amplifier module from subrack; see paragraph 5-6.1 preceding.

2. Pull out snap fasteners that secure fan to amplifier module. Disconnect fan power connector from amplifier module.

3. Install replacement in reverse order of steps 1 and 2 above.

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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

6-2 Troubleshooting

The ON/RESET switch can clear many alarm faults. It is located on the front panel of the faulted amplifier module. An attempt to reset the fault should be your first course of action. 24 Hour technical support service is available at our main phone number 888-797-9283 or 714-466-1000; select the "System Operator Technical Support" option to receive assistance from Powerwave's Applications Support Group.

The following are general guidelines established to aid Field Engineers or Cell Site Technicians in the proper method of Powerwave equipment fault resolution by fault mode.

6-2.1 DC Voltage Indicators Not Status Lamp not Illuminated

1. Check the front panel ON/OFF switch.

2. Check the power plant circuit breaker.

3. Check for +27 + 1.0 VDC at the amplifier subrack input.

A. If the voltage is low, verify that all DC connections between the power plant and the am-

plifier subrack are tight.

B. If the voltage is correct,

1. Remove the amplifier from the subrack slot and move the amplifier to another amplifier subrack slot.

2. Check the voltage on the power pins of the mating amplifier and amplifier subrack connector.

3. Verify that the amplifier DC connections are not damaged.

4. Return the amplifier to the factory for repair.

6-2.2 OVER PWR Illuminated or Blinking

1. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA DisableStatus LED is illuminate, then the input RF power level is too high and the amplifiers have been disabled. RF power may be incorrectly set during equipment commissioning. This may be due to a faulty jumper cable. Verify the amplifier subrack output cables, transmit filter, and directional coupler are in proper working order. The loss between the amplifier subrack and the hatch plate is typically less than 2.0 dB.

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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. RF power may be incorrectly set during equipment

commissioning. This may be due to a faulty jumper cable. Verify the amplifier subrack output cables, transmit filter, and directional coupler are in proper working order. The loss between the amplifier subrack and the hatch plate is typically less than 2.0 dB.

3. If only one or two amplifiers in a given amplifier subrack are in Over Pwr and the LPA Di

ableStatus LED is blinkingis illuminated after disabling or removing an amplifier, then the

amplifier subrack is probably in Sleep ModeConstant Gain Mode.(smart subracks with True RMS power detectors and voltage variable attenuators only).

A. The input power level must be adjusted to compensate for the loss of any module when

in constant gain mode. Pressing the On/Off/Reset switch momentarily in the Up position

or cycling DC power on the amplifier should bring the amplifier back on-line.

B. Sleep Mode

software available from Powerwave.

4. Move the amplifier to another slot in a different subrack, if available. Mark the amplifier with a sticker or place a tie wrap on the handle to identify the amplifier. Monitor for future failure.

A. If the same amplifier fails again, return the amplifier to the factory for repair.

B. If the replacement amplifier in the original subrack fails, replace the amplifier subrack.

Constant gain firmware may be disabled in the field with a PC interface and

6-2.3 HIGH TEMP Illuminated

1. If an amplifier is in HIGH TEMP and the LPA DisableStatus LED is illuminate, then the amplifier heat sinkmain amp base plate temperature is too high. This may be due to:

A. High ambient temperature.

B. Fan failure.

C. Insufficient air-volume capacity. Most of Powerwave’s amplifiers require a certain

amount of free-space to allow proper airflow.

2. Correct the heat problem, then reset the amplifier by momentarily pressing the Reset button on the amplifier front panel up.

6-2.4 VSWR Illuminated

1. If all the amplifiers in a given amplifier subrack are in VSWR and the LPA DisableStatus LED is illuminate, then the output RF reflected power level is too high and the amplifiers have been disabled. This may be due to a faulty jumper cable or transmit filter. Verify the amplifier subrack output cables, transmit filter, and directional coupler are in proper working order. The loss between the amplifier subrack and the hatch plate is typically less than 2.0 dB. This fault normally occurs during site or just following site power setting and normally takes about 10 to 15 minutes to reveal itself. This fault may not occur at low power levels (i.e. when just one or two channels are up).

2. If one amplifier in a given amplifier subrack is in VSWR and the LPA Disable LED is illuminated, then the output RF reflected power level is too high for that amplifier. This may be due to

A. A damaged or recessed amplifier RF output connector. Return the amplifier to the fac-

tory for repair.

Mishandling of the amplifier normally causes recessed pins. Before installing an amplifier, look at the D-sub connector to ensure none of the pins are recessed, bent or that

044-05060 Rev. C 6-2 July 2001November 2002

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.

6-2.5 DC FAIL Illuminated

If an amplifier is in DC FAIL and the LPA Disable LED is illuminate, then one of the four amplifier DC voltages is either out of tolerance or not present. Return the amplifier to the factory for repair.

6-2.6 6-2.5 FAN FAIL Illuminated

If an amplifier is in FAN FAIL, then the one or more of the amplifier’s cooling fans has failed. Replace the fan.

Model MCA9129-90

A single A fan failure does not cause the amplifier to shut down.

Two failed large fans cause the amplifier to shut down. These amplifiers have a small fan on the front lower panel. The smaller front fan’s performance is not monitored.

MCA9129-90-A Amplifiers

6-2.7 6-2.6 LOOP FAIL Illuminated

Loop Fail is always accompanied by LPA Disable LED illuminated. This may be due to

1. Inability of the amplifier to maintain a 180° phase shift between the first and second loops.

2. A damaged error amplifier. This can be caused by

A. Out of band spurious or intermods being applied at too high of a level at the amplifier in-

put port. An input band-pass filter may be necessary to correct this problem.

B. Disconnecting amplifier RF output cables while the amplifier is still turned on. Always

turn the amplifier off when moving output RF cables from the hatch plate to test equipment and back again.

3. Improper power balance between amplifiers in a given subrack.

A. Ensure the amplifier thumbscrews are properly tightened. Reset the amplifier by mo-

mentarily pressing the Reset button on the amplifier front panel up.

B. Try seating the amplifier in another subrack slot.

C. Try seating the amplifier in a subrack in another sector.

6-2.8 6-2.7 LOW PWR Illuminated

Low Power is always accompanied by the LPA Disable LED illuminated. This is due to the gain of either the internal preamplifier or main amplifier being 0.5 dB (typically) or more below the amplifier specification. The amplifier should be returned to the factory.

6-2.9 6-2.8 LPA DISABLEStatus LED Illuminated Only

1. LPA DisableStatus LED only illuminated indicates that the amplifier RF section is disabled. This may be due to the following:

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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 inter-

faced via RS-232 with a PC to determine exact cause for shutdown. This information is accessible with a Powerwave GUI interface program and the flight recorder provided in the amplifier software.

B. The front panel disable switch is in the down position.

B.A response to a subrack command, purposely inhibiting the amplifier (i.e. Sleep Mode acti-

vation)

C.Improper seating of the amplifier in the subrack.

2. Ensure the amplifier thumbscrews are properly tightened. Reset the amplifier by momentarily pressing the Reset button on the amplifier front panel up.

3. Try seating the amplifier in another subrack slot.

4. Try seating the amplifier in a subrack in another sector.

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) 4661000 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 our Repair Department for packing materials and information.

044-05060 Rev. C 6-4 July 2001November 2002

Powerwave Technologies 5JS0063 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual