Powerwave Technologies 5JS0050 G3L-800-60-004 User Manual I GENERAL DESCRIPTION

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Booster Amplifier Subrack System Integration Manual
System Integration
Manual
Booster Amplifier Subrack (BAS) System
869-894 MHz, 91 Watts Maximum
044-05075 Rev. A
Booster Amplifier Subrack System Intergration Manual
®
© 2000 Powerwave Technologies Incorporated. All rights reserved.
Powerwave Technologies, and the Powerwave logo are registered trademarks
Powerwave Technologies, Inc. reserves the right to make changes to the documentation and
equipment, including but not limited to component substitution and circuitry changes. Changes
that impact this manual may subsequently be incorporated in a later revision of this manual.
November 2000
Powerwave Technologies, Inc.
2026 McGaw Avenue
Irvine, CA 92614
044-05078 Rev. A
Tel: (949) 809-1100
Fax: (949) 757-0941
Web Site: www.powerwave.com
ii
Table Of Contents
Par.
No.
1-1
1-2
1-3
1-3.1
1-3.2
1-4
1-5
Section 1
General Description
Page
No.
Introduction.................................................................................................. 1-1
General Description ..................................................................................... 1-1
Functional And Physical Specifications .......................................................... 1-2
MCR20830-1 Subrack Specifications ............................................................. 1-3
G3L-800 Series Amplifier Specifications......................................................... 1-5
Booster Amplifier Subrack Major Components ............................................... 1-8
Equipment Changes...................................................................................... 1-8
Section 2
Installation
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
Introduction.................................................................................................. 2-1
Site Survey ................................................................................................... 2-1
Electrical Service Recommendations .............................................................. 2-1
Air Conditioning............................................................................................ 2-1
Unpacking and Inspection............................................................................. 2-2
Installation Instructions ................................................................................ 2-3
Amplifier Module Power, Alarm, Control, and RF Connector ........................... 2-4
Remote Control and Status ........................................................................... 2-5
Section 3
Operating Instructions
3-1
3-2
Introduction.................................................................................................. 3-1
Initial Start-Up and Operating Procedures ..................................................... 3-1
Section 4
Principles of Operation
4-1
4-2
4-3
4-4
4-5
4-5.1
4-5.2
4-5.3
4-5.4
4-5.5
4-6
4-7
Introduction.................................................................................................. 4-1
RF Input Signal............................................................................................. 4-1
RF Output Load ............................................................................................ 4-1
System Functional Description ...................................................................... 4-1
Multi-Carrier Power Amplfier Functional Description ..................................... 4-2
Predriver Amplifier ........................................................................................ 4-3
Three Stage Driver Amplifier.......................................................................... 4-3
Main Amplifier .............................................................................................. 4-3
Alarm Monitoring and Control ....................................................................... 4-3
Loop Control Circuit...................................................................................... 4-3
Amplifier Module Cooling............................................................................... 4-4
Power Distribution ........................................................................................ 4-4
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Table Of Contents (Continued)
Par.
No.
Section 5
Maintenance
Page
No.
5-1
Introduction.................................................................................................. 5-1
5-2
Periodic Maintenance .................................................................................... 5-1
5-3
Test Equipment Required For Test................................................................. 5-1
5-4
Performance Test .......................................................................................... 5-2
5-4.1 Amplifier Performance Test............................................................................ 5-2
5-4.1.1 Amplifier Spurious Emissions Test ................................................................ 5-2
5-4.1.2 Gain Test ...................................................................................................... 5-2
5-4.1.3 Input Return Loss ......................................................................................... 5-2
5-5
Field Replacement of the Module ................................................................... 5-5
Section 6
Troubleshooting
6-1
6-2
6-3
6-3.1
6-3.2
Introduction.................................................................................................. 6-1
Troubleshooting ............................................................................................ 6-1
Return for Service Procedures ....................................................................... 6-1
Obtaining an RMA......................................................................................... 6-1
Repackaging for Shipment............................................................................. 6-1
List Of Appendices
Page
No.
Appendix
Booster Amplifier Subrack Backplane Wiring Diagram ...................................A-1
Disrtibution Printed Circuit Board Pinout Location ........................................B-1
Power Setting Procedure................................................................................C-1
List Of Illustrations
Figure
No.
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
Page
No.
VVA, Voltage Regulator and Dip Switch Pin Configuration.............................. 1-2
Booster Amplifier Subrack System-Top View .................................................. 1-9
Booster Amplifier Subrack Sysytem-Front View............................................ 1-10
Booster Amplifier Subrack System-Side View (Front Door Open)................... 1-11
Booster Amplifier Subrack System-Side View with Fans Removed................. 1-11
Booster Amplifier Subrack-Backplane.......................................................... 1-12
G3L-800 Series Amplifier............................................................................. 1-13
G3L-800 Series Amplifier – Rear, Top, Front Views....................................... 1-14
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Table Of Contents (Continued)
List Of Illustrations (Continued)
2-1
2-7
4-1
4-2
5-1
J5 Alarm Connector ...................................................................................... 2-4
Front Panel POWER IN Connector ................................................................. 2-5
System Block Diagram .................................................................................. 4-1
G3L-800-60 Multi-Carrier Power Amplifier Functional Block Diagram ............ 4-2
G3L-800-60 Amplifier Test Setup Diagram..................................................... 5-3
List Of Tables
Table
No.
1-1
1-2
1-3
1-4
1-5
1-4
1-7
1-8
2-1
2-2
2-3
5-1
5-2
5-3
6-1
Page
No.
Truth Table (Variable Attenuator) .................................................................. 1-2
Booster Amplifier Subrack System Specifications ........................................... 1-3
2-Way Splitter Electrical Specifications .......................................................... 1-4
2-Way Combiner Specifications ..................................................................... 1-4
G3L-800-Series Ampifier Electrical Specifications .......................................... 1-5
G3L-800-Series Amplifier Mechnaical Specifications....................................... 1-6
G3L-800 Series Amplifier Environmental Specifications ................................. 1-7
Major BAR System Components .................................................................... 1-8
Remote Control and Status Specifications...................................................... 2-5
J5 Alarm Connector Pin Designation ............................................................. 2-4
Front Panel POWER IN Connector Pin Designations ....................................... 2-5
Periodic Maintenance .................................................................................... 5-1
Test Equipment Required .............................................................................. 5-1
Multichannel Power Amplifier Test Data Sheet ............................................... 5-4
Troubleshooting ............................................................................................ 6-1
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Section 1. General Description
1-1 Introduction
This manual contains information and procedures for the installation, operation, and maintenance
of Powerwave Technologies, Inc.’s (Powerwave’s) Booster Amplifier Subrack (BAS) system. This
manual is organized into the following sections:
Section 1. General Description
Section 2. Installation
Section 3. Operating Instructions
Section 4. Principles of Operation
Section 5. Maintenance
Section 6: Troubleshooting
Appendix A: Backplane Wiring Diagram
Appendix B: Distribution PCB Pinout Location
Appendix C: Power Setting Procedure
1-2 General Description
Engineered to operate in a 2-way transceiver paging base station, the BAS system is a linear,
Multi-Carrier Power Amplifier (MCPA) system that operates in the 5 MHz frequency band from
869 MHz to 894 MHz. The system integrates the model MCR20830-1Booster Amplifier Subrack
(BAS) with two 60 Watt (model G3L-800-60) MCPAs to deliver a composite RF output of up to
100 Watts, after combined losses
Designed to function as a subrack (see Figures 1-2 thru 1-6) in the host base station, the enclosure has a one inch (right and left side) flanged front panel and eight mounting holes (four on
each side) to secure the Subrack into place (refer to Figure 1-3 for mounting hole locations). To
aid in maintaining the system’s operating temperature, the BAS is equipped with two cooling fans
mounted on the front access door (see Figures 1-3 and 1-4). Each 60W amplifier displaces approximately 1,900 BTUs of heat at full power.
The composite input signal is applied to a 30dB 10W input attenuator, followed by a voltage variable attenuator that is controlled via dip switches on the front panel (refer to Table 1-1 and Figure
4-1). The maximum composite input signal may not exceed +31dBm. The composite signal is
then fed to a two-way power splitter. The signals are applied to the amplifiers, and the amplifier
outputs are combined again (refer to Tables 1-2 through 1-7 for specifications). With both amplifiers installed, the system provides 20dB of gain.
The BAS also houses a distribution printed circuit board (PCB) for internal power and alarm distribution (refer to Appendix B). Accessible from the front panel is the DB9 external ALARM connector, the RF IN and RF OUT type N connectors.
Additionally, the front panel provides access to the +27 Vdc POWER IN connector, visibility of the
two MCPA’s fault alarm LED indicators and the GAIN CTRL dip switch. Refer to Table 1-1 for the
dip switch truth table and Fiqure 1-1 for pin designations.
With the access door open, the two amplifier modules are visible. All solid-state, the MCPAs are
designed for parallel operation for high peak power output. Their modular construction and
unique and highly effective LED-based operational status and fault indicators help minimize
downtime. The turn-on and turn-off sequence of voltages are fully automatic, as is overload protection and recycling. Inadvertent operator damage from front panel manipulation is virtually impossible. Refer to Figures 1-7 and 1-8 for drawing views of the amplifier module.
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Table 1-1 Truth Table Input Variable Attenuator
Pin 1
Pin 2
Pin 3
Pin 4
Attenuation
+5Vdc
+5Vdc
+5Vdc
+5Vdc
0dB
+5Vdc
+5Vdc
+5Vdc
0Vdc
1dB
+5Vdc
+5Vdc
0Vdc
+5Vdc
2dB
+5Vdc
+0Vdc
+5Vdc
+5Vdc
4dB
+5Vdc
+5Vdc
+5Vdc
0Vdc
8dB
0Vdc
0Vdc
0Vdc
0Vdc
15dB
DIP SWITCH
SOCKET
VOLTAGE
REGULATOR
VARIABLE
ATTENUATOR
OUTPUT
+5Vdc
Vout
GND
GND
GND
GND
NC
GND
NC
GND
GND
10
INPUT
GND
+27Vdc (Vin)
Figure 1-1 Variable Attenuator, Voltage Regulator and Dip Switch Socket Pin Configuration
1-3 Functional and Physical Specifications
The BAS system’s functional and physical specifications are listed in Table 1-2. A functional block
diagram is provided in Section 4 of this manual to illustrate the system’s operational layout.
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1-3.1 MCR20830-1 Subrack Specifications
Table 1-2 MCR20830-1 Booster Amplifier Subrack System Specifications
Frequency
869 – 894 MHz
Gain
+20 dBm, ± 0.2 dBm
RF Input Power
+31 dBm composite w/variable attenuator set
to 0dB attenuation.
+46 dBm composite w/variable attenuator set
to 15 dB attenuation.
RF Output Power:
60W modules
52.3 Watts (+47.18 dBm) 1 module
91.0 Watts (+49.59 dBm) 2 modules
Phase Variation
± 5°
Alarms
+5 Vdc TTL
D.C. Power
+ 27 Vdc, 55 Amps max
Total System Return Loss
-19 dBm
Channel Spacing
12.5 KHz
Operating Temperature
0 to 50 degrees C
Subrack Dimensions
12.22(H)x*17(W)x24.5(D) inches
Weight (Fully assembled)
Approximately 80 Pounds (36.28 kilograms)
*Note: Does not include 1-inch right and left side mounting flanges.
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Table 1-3 Electrical Specifications for 2-Way Splitter
Insertion Loss
-33dB Min. (TBD on actual part)
-48dB Max.
Amplitude Balance
±0.2dB Max.
Insertion Loss Flatness Over Frequency
±0.3dB Max.
Input/Output Return Loss
-20dB Min.
Port to Port Phase Delta
±5 Degrees Max.
Port to Port Isolation
-20.0dB Min.
IP3 (Input Power = 5dBm)
-90dBc Min.
Power Handling (Fixed Attenuator)
20 Watts Max.
Power Handling (Variable Attenuator)
3.16 Milliwatts Max.
Table 1-4 Electrical Specifications for 2-Way Combiner
Insertion Loss
-0.6 dB (TBD on actual parts)
Amplitude Balance
±0.2dB Max.
Insertion Loss Flatness Over Frequency
±0.3dB Max.
Input/Output Coupled Port Return Loss
-18.0 dB Min.
Port to Port Phase Delta
±5 Degrees Max.
Port to Port Isolation
-20.0dB Min..
Power Handling
120 Watts
Sampling Coupler
-25dB ±1dB
Sampling Coupler Directivity
-18.0 dB Min.
IP3 (Input Power = TBD)
-100 dBc Min
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1-3.2 GL3-800 Series Amplifier Sprecifications
Table 1-5 G3L-800 Series Amplifier’s Electrical Specifications
Frequency Range
869-894 MHz
Channel Spacing
12.5 KHz
Output Power:
GL3-900-60
+47.8 dBm (60 Watts)
Input Power
-10.0 dBm max.
RF Gain
GL3-900-60-001, -006
+57.8 dB ±1.0 dB @ +27Vdc, 25 C
G3L-800-60-002, -004
+62 dB ±1.0 dB @ +27Vdc, 25 C
G3L-800-60-003
+65 dB ±0.7 dB @ +27Vdc, 25 C
RF Gain Flatness over the
operating frequency range
±0.1 dB over any 1.25 MHz (over the frequency range).
Gain Flatness:
±0.5 dB (935 MHz – 942 MHz)
Normal Operating Voltage
+27 Vdc ±1V Nominal (±5%) 1Vpp ripple (100-120 Hz) max.
Current Consumption:
GL3-900-60
27 Amps @ 27 Vdc, 25 °C, Prf = 50 Watts average
Abnormal Operating Voltage
+21 Vdc to below +26 Vdc. Above +28 Vdc to +29 Vdc.
RF Gain variation by Temp &
Voltage
TBD
Gain Variation Over Dynamic
Range
±0.1 dB max./20 dB for 0 to –20 dB rated power output
Intermodulation Distortion
-65 dBc min. (Main signal power to Spurious @ (12.5 kHz)
In-Band Spurious
-55 dBc min @ +23 to +24 Vdc
Input/Output VSWR.
1.5: 1 max @ 65 ± ºC.
Load Stability
Infinite VSWR. all phases
Output Isolation
20 dB min. (shall incorporate an output isolator)
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Table 1-6 G3L-800 Series Amplifier’s Mechanical Specifications
Items
Specifications
Physical Dimension of
MCPA
Front panel: 342.5mm(W) x 99mm(H) x 3mm(D)
Body: 288.8mm(W) x 95.3mm(H) x 446mm(D)
Weight
Approximately 28.6 pounds (13 killograms)
Connector Type
D-sub, Hybrid, Plug-in Type RF connector: PKZ 26-0020 series
straight plug type (Phoenix Co.) refers to attached drawing.
MCPA Front Panel Switch
CKT Breaker. +27 Vdc Power Indicator
Connector
Description
Pin Outs
A1
RF Output
(Coaxial Contact)
A2
Ground
(Power Contact)
A3
+27 Vdc
(Power Contact)
A4
RF Input
(Coaxial Contact)
TX H
10
+27 V
TX L
11
COM SV
GND
12
AMP AO
RX H
13
AMP A1
RX L
14
AMP A2
GND
15
AMP A3
HERE LPA
16
NC
FF LPA
17
NC
RESERVED
Markings
TBD
Front Panel LED Display
LED type: SMD
RUN
GREEN (When MCPA is enabled)
ALM
Red (When any alarm occurred, LED is on)
DC
Green (When DC Power is ON, LED is on)
MCPA Captive fastener
TBD
Front Panel color & silk
TBD
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Table 1-7 Environmental Specifications for G3L-800 Series Amplifiers
Items
Specifications
Operating Temperature
0 to + 50 C
Storage Temperature
-40 to + 85 C
Relative Humidity
5 to 90% RH (non-condensing)
Operating Air Pressure
860 to 1060 mbar
Shock
40 m/s s* @ 22 ms half sinusoid shock
Pressure
Integral forced air cooling must operate correctly at
up to 0.3 inches back.
Vibration
Bellcore TR-NWT-000063 (1 m/s*s0.1∼200Hz)
Corrosion Resistance/ Salt Fog
The MCPAs shall comply with the requirements of
Bellcore Technical Reference TA-NWT-000487, Issue 2, Section 4.12
Altitude
All specifications shall be met at an altitude up to
15,000 feet where the maximum external ambient
temperature is decreased by 0.5 C/ 1000 feet above
sea level. The MCPAs shall not sustain damage
when being transported at altitude up to 40,000 feet
or uniformly applied pressure to 30 PSIA.
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1-4
Booster Amplifier Subrack System Integration Manual
Booster Amplifier Subrack (BAS) System Major Components
Table 1-8 lists the model numbers and descriptions of the major components that comprise the
BAS system and the document number (if available) of the manual related to each component.
Table 1-8 Major BAS System Components
Qty Per
Expandable
To
Model/PN
Description
800-01292-001
Top Assembly, BAS II w/o
Combiner Backplane
800-01294-001
Front Panel Assy
700-00901-001
Cable Assy, Power In
700-00902-001
Cable Assy, Amp Power
700-00903-001
Cable Assy, Amp Power
700-00904-001
Cable Assy, Fan
700-00905-001
Cable Assy, Amplifier
800-001296-001
Fan Assy
800-01297-001
Tray Assy
500-01425-001
PCB Assy, Power Distribution
MCR20830-1
Booster Amplifier Subrack
GL3-900-60-005
60-Watt Amplifier
System
1-5 Equipment Changes
Powerwave Technologies, Inc. reserves the right to make minor changes to the equipment, including but not limited to component substitution and circuitry changes. Changes that impact this
manual may be incorporated in a later revision of the manual.
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Figure 1-2 Booster Amplifier Subrack System – Top View
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Figure 1-3 Booster Amplifier Subrack System – Front View.
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Figure 1-4 Booster Amplifier Subrack System – Side View (Front Door Open)
Figure 1-5 Booster Amplifier Subrack System – Side View with Fans Removed
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Figure 1-6 BAS Backplane
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Figure 1-7 Model GL3-800 Series Amplifier
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Figure 1-8 Model GL3-800 Series Amplifier - Rear, Top and Front Views
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Booster Amplifier Subrack System Integration Manual
Section 2. Installation
2-1 Introduction
This section contains unpacking, inspection, installation instructions and recommendations for the
Booster Amplifier Subrack (BAS) System. 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. 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. Pay particular attention to power
plant capacity, air conditioning needs, and RF/DC cabling/breaker requirements.
2-3 Electrical Service Recommendations
Powerwave 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.
§
Straight, short ground runs be used.
§
The electrical service must be well grounded.
Circuit breakers should be thermal type, capable of handling the anticipated inrush current, in a
load center with a master switch.
2-4 Air Conditioning
Each GL3-900-60-005 amplifier generates 1900 BTUs of heat at full power. A fully populated
MCR20830-1 Booster Amplifier Subrack system operating at full power will generate 3800 BTUs
(using two GL3-900-60) amplifiers. At least a 1/3-ton air conditioner is needed to cool this Powerwave equipment.
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Unpacking And Inspection
This equipment (as applicable) has been operated, tested and calibrated at the factory. Carefully
open and remove the MCPAs and model MCR20830-1 Booster Amplifier Subrack (BAS) from
their respective containers. Retain all packing material that can be reassembled in the event that
the unit must be returned to the factory. Please perform the following steps:
CAUTION
Exercise care in handling equipment during inspection to prevent
damage caused by rough or careless handling.
1. Visually inspect the MCPAs and the BAS for damage that may have occurred during shipment.
2. Check for evidence of water damage, bent or warped chassis, loose screws or nuts, or extraneous packing material in the connector(s).
CAUTION
Before applying power, make sure that all connectors to the BAS
components are secure. Make sure that the input and output of the
BAS are properly terminated at 50 ohms. Do not operate the system
without a load attached. Refer to Section 1, Table 1-2 for input power
requirements. Excessive input power may damage the equipment.
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.
§
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 the equipment is damaged and must be returned to the factory:
§
Please write or phone for return authorization. Refer to section 6-3.1 of this manual for instructions.
§
Powerwave 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 PERFORMANCE
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2-5 Installation Instructions
The model MCR20830-1 Booster Amplifier Subrack (BAS) is designed for use in a
2-way transceiver paging base station. The host enclosure must permit access to the subrack for;
DC power, RF and monitor cables. As well as, proper ventilation. The BAS system is designed
for an enclosure with at least 36 inches of depth. Please proceed with installation as follows:
WARNING
Verify that all circuit breaker switches on the subrack are in the OFF
position. Turn off external primary DC power before connecting DC
power cables.
1. Install the subrack into the host base station and secure it into place using #10 32x1/2 Phillips
screws and #10 flat washers.
2. Connect POWER IN (+27 Vdc) to the subrack. Refer to Figure 2-1 for pin locations and Table
2-2 for pin designations.
3. Connect RF IN cable to the subrack.
4. Connect RF OUT cable to the subrack.
5. Connect external ALARM interface to external summary board. Refer to Figure 2-2 for pin
locations and Table 2-4 for pin designation.
6. Loosen thumbscrews to the front access door and open the door.
7. Before installing the MPCA into the subrack, inspect the 21-pin D-sub male combo connector
on the rear of each amplifier. Verify that all pins are straight, no pins are recessed, and that
the alignment shield is not bent.
8. Place power ON/OFF switch on the MCPA’s front panel in the “off” (far-left) position.
WARNING
Do not slam amplifiers into the subrack. Forcing the amplifier into
the surack at too fast a rate may cause the pins on the 21-D-sub
conector of the amplifier to become recessed or broken.
9. Insert a plug-in MCPA into the subrack. Tighten thumbscrews.
10. Repeat steps 7, 8 and 9 for the second MCPA.
WARNING
Check your work before applying DC voltage to the system. Make
certain all connections are tight and correct.
11. 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.
12. Refer to Section 3 for initial turn-on and checkout procedures.
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2-6 Amplifier Module Power, Alarm, Control, and RF Connector
The power, alarm, control, and RF connections on the amplifier are made through a 21WA4 male
connector and are listed and described in Table 2-1 below and in Section 1, Table 1-4.
Table 2-1 MCPA Alarms & Controls
Items
Alarms & Controls
Specifications
TTL Level; +5 Volts
Buffer: 74ABT244 (5V) - recommended
When unit does not exist (HEAR_PAU)
Equipped: GND Deletion OPEN
When unit does not exist (HEAR_PAU)
Normal: High Abnormal GND
3:1 (6dB ± 1dB) @ 35dBm-48dBm Output Power. PAU
remains normal operation when this alarm condition
disappears (NOT shutdown)
This alarm only at +75ºC. +5 ºC//-0 ºC
@output power is greater than +48.5 dBm ±0.5dB.
MCPA will recover when the alarm condition disappears. (NOT shutdown).
@ +20.5 Vdc ± 0.5V or +29 Vdc ± 0.5V. When this
alarm occurs the MCPA shall shut-down
When an alarm occurs on the feed forward path.
Reserved
Deletion Alarm
Function Fail Alarm
VSWR Alarm
High Temp. Alarm
Over Power Output
Alarm
DC Fail Alarm
Loop Fail Alarm
EN/DISABLE
Remarks
D-Line
D-Line
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
The Alarm Interface connector on the front panel of the MCR20830-1 Booster Amplifier Subrack
is a 9-pin female D-sub connector that permits serial interface with the external alarm monitor.
Refer to Figure 2-1 and Table 2-3 for connector definition.
Figure 2-1 J5 Alarm Connector
Table 2-2 J5 Alarm Connector Pin Designation
Pin
044-05078 Rev A
Description
HERE_PAU-1
FF_PAU-1
DC_ON/OFF_1
PAU_RST_1
HERE_PAU_2
FF_PAU_2
DC_ON/OFF_2
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PAU_RST_2
No Connection (NC)
2-7 Remote Control and Status
Refer to Table 2-3 for a description and list of remote control and status specifications for the
MCPA.
Figure 2-2 Front Panel POWER IN Connector
Table 2-3 Front Panel POWER IN Connector Pin Designations
Pin
044-05078 Rev A
Description
+27Vdc
Ground
+27Vdc
NC
+27Vdc
Ground
Ground
2-5
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Booster Amplifier Subrack System Integration Manual
â
Table 2-4 Remote Control and Status
Items
RS-485
Physical
Layer
Asynchronous
Packet
Protocol
Address
Specifcations
Each MCPA shall support an RS-485 multi-drop differential serial asynchronous communications link operation at 9600 baud, 1 bit start, 8 bit data, 1
bit parity, 1 bit stop bit. The host shall terminate the RS-485 differential receive and transmit lines with 120 ohms. Because this communications bus
is also shared with other system resources. The MCPA is required to support the following asynchronous packet format communications protocol.
Packet format used for both commands and responses.
Byte
Field
Description
Source ID
Address of Source
Destination ID Address of Destination
CMND/ ECHO Command/ Echo field
Each MCPA shall receive but IGNORE any data packet NOT ADDRESSED
to itself. The receiver must reset its state machines and ready itself to
Receive the start of the next packet if it observes no activity on its RS-485
receive lines in 50 ms.
The CMND/ ECHO byte is used to send commands from host to MCPA as
follows:
Byte
Field
Description
Source ID
Address of Source
Destination ID Address of Destination
-b(7): 0
-b(4:6): PAS ID
-b(0:3): PAU slot ID
CMND
00H
01H-ffH
Response
from PAU
MCPA responses always echo the received CMND bytes as an ECHO byte of the
response packet.
Byte
044-05078 Rev A
Command Field
CMND/ ECHO=
Report status
Reserved
Field
Source ID
Destination ID
Report Data
Description
-b(7): 0
-b(4:6): PAS ID
-b(0:3): PAU slot ID
Address of Source
-b0: 1= High VSWR
condition/ 0=normal
-b1: 1=High Temperature
condition/ 0=normal
-b2: 1=Over Power
condition/ 0=normal
-b3: 1=DC fail
condition/ 0=normal
-b4: 1=Loop alarm
condition/ 0=normal
-b5: 1=PAUenable
Condition/ 0=normal
-b6: reserved (0)
-b7: reserved (0)
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Section 3. Operating Instructions
3-1 Introduction
This section contains operating instructions for Powerwave’s Booster Amplifier Subrack (BAS)
system.
3-2 Initial Start-Up and Operating Procedures
To perform the initial start-up, proceed as follows:
1. Double check to ensure 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 Table 1-1 for input power
requirements. Excessive input power may damage the MCPA
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. Turn on the supply that provides +27 Vdc to the amplifier system.
3. Place the power ON/OFF switch on the amplifier front panel in the “ON” (middle) position.
4. Close the front access door. Tighten the thumbscrews.
5. Ensure that the GAIN CTRL dip switch is set at minimum gain (maximum attenuation). Refer to Section 1, Table 1-1 for the dip switch’s truth table.
6. Allow the amplifiers to warm up for at least 5 minutes before taking power readings.
7. Refer to Appendix C for the power setting procedure.
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Section 4. Principles of Operation
4-1 Introduction
This section contains a functional description of Powerwave Technologies Inc.’s, Booster Amplifier Subrack (BAS) system. Refer to Figure 4-1 for the system’s functional block diagram.
4-2 RF Input Signal
The maximum input power for all carrier frequencies to the system should not exceed the limits
specified in Section 1, Table 1-2.
4-3 RF Output Load
The load impedance should be as good as possible (VSWR of 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).
MCR 20830-1
GAIN
CTRL
GL3-800-60
Splitter
60w
30 dB
VVA
RF Input
RS-485 Alarm
Interface
DB9
ISO
2x Ground
Alarm
Ctrl
60w
ISO
2x +27VDC
MCR 20830-1
Distribution
Circuit
Board
(DC,Fans,
Alarms)
Alarm
-25dB
Sample
RF Output
Figure 4-1 System Block Diagram
4-4 System Functional Discription
Designed as a subrack for installation in a 2-way transceiver paging base station, the BAS system
is comprised of a MCR20830-1 Booster Amplifier Subrack (BAS) and two G3L-900-60 plug-in
multi-carrier power amplifiers (MPCAs).
Additionally, the BAS houses a two-way power splitter/combiner and a distribution printed circuit
board (PCB). Refer to Appendix A for pinout locations. The RF IN, RF OUT, +27 Vdc and the
ALARM summary connector, interface with the host system via front panel cabling.
The RF input signal is split equally and applied to the plug-in amplifiers. The output from each
amplifier is an amplified composite signal of approximately 60 Watts before combiner losses. All
phase and gain corrections are performed on the signal(s) in the individual amplifier. The amplifier outputs are fed to a power combiner and combined to form a composite RF output of up to 91
Watts after combiner losses. Refer to Figure 4-1 for the System Functional Block Diagram.
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The distribution printed circuit board (PCB) assembly is used to distribute power to the BAS system’s internal components. The PCB circuit is a DC/DC converter designed to convert the +27
Vdc input to +12 Vdc and +15 Vdc. Refer to Appendix B for pinout location.
4-5 Multi-Carrier Power Amplifier (MCPA) Functional
Description
The MCPA is a linear, feed-forward multi-carrier power amplifier that operates in the 5 MHz frequency band from 869 MHz to 894 MHz at an output power 60 Watts. Each amplifier is a selfcontained module and is functionally independent of the other MCPA in the system. The amplifiers are designed for parallel operation to achieve high peak power output (refer to Table 1-2 for
MPCA power specifications). Each MCPA has an alarm board that monitors the amplifier performance. If a failure or fault occurs in an MCPA, it is transmitted to the host system via the Dsubminiature 21WA4 connector at the rear of the module. A warning light (LED), which is routed
from the amplifier via the J7 connector on the PCB to the front panel of the BAS, will illuminate.
The indicator LEDs are identified as Alarm 1 and Alarm 2 which corresponds to their respective
amplifier..
The amplifier is compliant to the requirements of FCC Part 22 with respect to spurious emissions.
Constant gain is maintained by continuously comparing active paths with passive references, and
correcting for small variations through the RF feedback controls. All gain variations, for example
those due to temperature, are reduced to the passive reference variations. The amplifier is comprised of: A preamp
A driver amplifier
A main amplifier
An error and pre-error amplifier
Alarm monitoring and control
-40dB
1st Loop
Phase & Gain
Pre
Main
FWD
PWR
Pre
Amp
RF Out
Main
Amp
2nd Loop
Phase & Gain
Delay
Delay
-30dB
-10dB
RFL
PWR
Error
Amp
Feed Forward Loop control
+15 +5 -5 +27VDC
Power Supply
Alarms & Display
Front Panel
Smart Rack
Figure 4-2 Multi-Carrier Power Amplifier Functional Block Diagram
4-5.1 Pre-driver Amplifier
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The input of the amplifier uses two stages of class AB amplification which provide approximately
13.5 dB of gain in the 5 MHz frequency band from 869 MHz to 894 MHz. The amplifier operates
on +27 Vdc.
4-5.2 Three-Stage Driver Amplifier
The input of the amplifier uses three stages of class AB amplification which provide approximately
32 dB of gain in the 5 MHz frequency band from 869 MHz to 894 MHz. The amplifier operates on
+27 Vdc, and a bias voltage of +5 Vdc. The logic controls the +5 Vdc bias voltage that shuts
down the amplifier.
4-5.3 Main Amplifier
The signal provides approximately 11 dB of gain in the 869 to 894 MHz frequency band. The output from the main amplifier is typically 60 Watts. The main amplifier operates on +27 Vdc, and a
bias voltage of +5 Vdc. The alarm logic controls the +5 Vdc bias voltage that shuts down the amplifier.
The main amplifier employs class AB amplification for maximum efficiency. The error amplifier
and feed forward loops are used to correct signal non linearities introduced by the class AB main
amplifier. The error amplifier operates in class A 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 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 sample 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.
4-5.4 Alarm Monitoring and Control
During routine operation, 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. When this happens, the ALARM LED is illuminated on the
front panel of the subrack. The fault is transmitted back to an external summary module via the
external ALARM interface connection on the front panel of the subrack.
4-5.5 Loop Control Circuit
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 first 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.
The second loop control section obtains a sample of the distortion added to the output signals by
the main amplifiers. The signal is phase shifted 180 degrees, then fed to the error amplifier where
it is amplified to the same power level as the input sample. The signal is then coupled to the error
signal on to the main output signal. The final output is monitored by the second loop and adjusted
to ensure that the signal distortion and intermodulation distortion (IMD) on the final output is cancelled out.
4-6 Amplifier Module Cooling
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Although each amplifier contains it own heat sink, it is cooled by forced air. Two fans mounted on
the front of the subrack are used for forced air cooling and redundancy. The fans draw air
through the front of the system and exhaust hot air out the back. The fans are field replaceable.
Each amplifier, when properly cooled, will provide sufficient cooling to maintain the amplifier within
the specified operating temperature range. Six inches of free space are required at both the front
and rear panels of the subrack to allow adequate air volume to circulate over the heat sinks.
4-7 Power Distribution
Primary DC power for the amplifier is provided by the host system. The amplifier module has a
DC/DC converter and voltage regulator that converts the +27 Vdc to +15 Vdc, +5 Vdc, and +8 Vdc
for internal use.
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Booster Amplifier Subrack System Integration Manual
Section 5. Maintenance
5-1 Introduction
This section contains periodic maintenance and performance test procedures for Powerwave’s
Booster Amplifier Subrack (BAS) system.
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.
Table 5-1. Periodic Maintenance
Task
Inspection
Cables and Connectors
Interval
Action
12 Months
Performance Tests
Clean Fans/Heat Sinks
12 Months
3 Months
Inspect signal and power cables for frayed insulation.
Check RF connectors to be sure that they are tight.
Perform annual test per paragraph 5-5.
Inspect for debri. Remove dust with a soft
cloth/brush or vacuum cleaner.
5-3 Test Equipment Required For Test
Test equipment required to test the amplifier 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 required must be calibrated to 0.05 dB
resolution. Any deviation from the nominal attenuation must be accounted
for and factored into all output readings.
Table 5-2. Test Equipment Required
Nomenclature
Signal Generator
20 dB Attenuator, 250 Watt
20 dB Attenuator, 20 Watt (2 each)
Spectrum Analyzer
Coax Directional Coupler
Power Meter / Sensor
Arbitrary Waveform Generator
Network Analyzer
Source Diskette
044-05078 Rev. A
Manufacturer
H.P.
Bird
Bird
H.P.
H.P.
H.P.
Sony
H.P.
Powerwave
5-1
Model
8656B
Tenuline
Tenuline
8560E
778D
437B / 8481A
AWG2021
8753C
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Booster Amplifier Subrack System Integration Manual
5-4 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 5
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.
5-4.1 Amplifier Performance Test
To perform this test, proceed as follows:
Connect test equipment as shown in Figure 5-1.
WARNING
Do not apply any RF signals at this time.
5-4.1.1 Amplifier Spurious Emissions Test:
With the RF input signal to the amplifier set to be as shown in Figure 5-1, use the spectrum analyzer to measure the spurious emissions performance. Record test data in Table 5-3. Verify that
it is within the specifications shown in Table 1-2. Switch tested amplifier to OFF.
5-4.1.2 Gain Test:
1.
Disconnect spectrum analyzer from test setup, and connect the network analyzer.
2.
Set network analyzer as follows:
3.
A.
Power output to -13 dBm.
B.
Frequency start to 869 MHz.
C.
Frequency stop to 894 MHz.
D.
Normalize the network analyzer for gain and return loss.
Check the amplifier gain across the band from 869 MHz to 894 MHz. Gain should be as
specified in Table 1-2. Record test data in Table 5-3.
5-4.1.3 Input Return Loss:
Read and record the S11 return loss measurement on network analyzer. Record test data in Table
5-3.
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Figure 5-1 Amplifier Test Setup Diagram
044-05078 Rev. A
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Booster Amplifier Subrack System Integration Manual
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Table 5-3. Multi-Carrier Power Amplifier Test Data Sheet
DATE _________________________________
MODULE S/N ___________________________
TEST CONDITIONS:
Load and Source Impedance: 50 Ohms
VSWR: < 1.2:1
Supply Voltage: +27 Vdc ±0.1 Vdc
TEST
RF Gain
Spurious
Emissions
Gain Flatness
Input Return
Loss
PASS
SPECIFICATION
Vcc = 27 Vdc
PO = 50 W
Freq. = 869 – 894 MHz
Vcc = 27 Vdc
PO =50 W
869 - 894 MHz Band
Vcc = 27 Vdc
PO =50 W
869 - 894 MHz Band
Vcc = 27 Vdc
PO = 50 W
869 - 894 MHz Band
MIN
Table 1-2
-0.5 dB
MAX
Table 1-2
+0.5 dB
DATA
-65 dBc
±0.5 dB
-12 dB
FAIL
Tested by
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5-5 Field Replacement of the Module
The GL3-900-60 multi-carrier power amplifier module can be replaced in the field on site by a
qualified technician with experience maintaining RF power amplifiers and similar equipment:
To replace a power amplifier module, proceed as follows:
1.
Set on/off switch on the front panel of the amplifier module to OFF (down).
2.
Loosen two thumbscrews 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 21WA4 multipin connector.
3.
With steady even pressure, use handle on front of amplifier to pull module out of subrack.
4.
Install replacement in reverse order of steps 1 through 3 above.
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Booster Amplifier Subrack System Integration Manual
Section 6. Troubleshooting
6-1 Introduction
This section contains a list of problems which users have encountered 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. 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.
6-2 Troubleshooting
Refer to Table 6-1 for troubleshooting suggestions.
Table 6-1. Troubleshooting.
Symptom
Inoperative
MCR20830-1 Fan Noise
GL3-900-60-001, -002, -003,
-004, -006 Inoperative
Suggested Action
1.
2.
3.
1.
2.
3.
1.
2.
3.
Check for proper power supply voltages.
Verify all RF connections.
Contact your field representative.
Locate noisy fan.
Check for damage
Replace noisy or damaged fan
Check for proper power supply voltage.
Verify all RF connections.
Verify that unit does not have a major fault (red LED on
front panel). Recycle power.
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 (949) 809-1100 to obtain this
number, or FAX your request to (949) 757-6676. 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 Powerwave’s Customer Service Department for packing materials and information.
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Appendix A. Booster Amplifier Subrack Backplane Wiring Diagram
AMP_1
A1
P2
A2
(TX_H)
(TX_L)
GND
(RX_H)
(RX_L)
GND
22
23
(HERE_PAU)
(FF_PAU)
(DC_ONNOFF)
(PAU_RST)
10
24
(DIV_SW)
11
(COM_SW)
12
A1
(AMP_A0)
13
A2
(AMP_A1)
14
15
16
25
26
(AMP_A2)
LED_GRN ANODE
27
28
RF IN
20
21
+27Vdc
RF INPUT
LED_RED ANODE
17
GND
A3
NC
A4
RF OUTPUT
AMP_2
A1
A2
10
29
11
30
12
31
(TX_H)_2
GND_2
(RX_H)_2
(RX_L)_2
(FF_PAU)_2
17
A3
A4
10
(DIV_SW)_2
11
(COM_SW)_2
12
(AMP_A0)_2
13
(AMP_A1)_2
14
35
36
16
(PAU_RST)_2
17
15
33
16
14
14
34
13
(DC_ONNOFF)_2
1-
12
GND_2
11
(HERE_PAU)_2
15
+27Vdc
(TX_L)_2
13
32
RF INPUT
(AMP_A2)_2
15
LED_GRN ANODE_2
16
LED_RED ANODE_2
17
18
GND
37
A3
NC
A4
044-05078 Rev. A
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RF OUTPUT
RF OUT
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Appendix B. Distribution Printed Circuit Board
Pinout Location
DB37 PINOUT
20
P4
J4
21
22
TX_H
TX_L
RX_H
RX_L
RS485
23
24
25
26
27
HERE_PAU_1
FF_PAU_1
DC_ON/OFF_1
10
PAU_RST_1
11
DIV_SW_1
12
COM_SW_1
13
14
O TP1
(AMP_A0_1)
AMP_A1_1
15
AMP_A2_1
16
28
29
17
11
12
31
NC
N/C
TX_H
19
J6
TX_L
21
22
RX_H
23
RX_L
24
13
32
14
33
15
34
16
35
SPLITTER/COMBINER
HERE_PAU_2
25
26
FF_PAU_2
27
DC_ON/OFF_2
28
PAU_RST_2
29
DIV_SW_2
30
COM_SW_2
31
AMP_A0_2
J7
32
17
36
37
19
044-05078 Rev. A
TP2
33
LED_GRN_2
34
18
ALARM
LED_ RED_1
20
30
LED_GRN_1
18
10
J5
35
LED_RED_2
36
N/C
37
N/C
38
N/C
39
N/C
40
N/C
LED
B-1
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Booster Amplifier Subrack System Integration Manual
â
Appendix C Power Setting Procedure
C-1 Power Setting Calculations:
1.
Ensure the composite input power to the Powerwave MCR20930-1 is < 0 dBm.
2.
Determine the required output level at the hatch plate per carrier (Analog, Digital, CDPD, and
Setup Channels). Follow the example after step 5 below.
3.
Determine the amount of loss between the subrack output and the hatch plate.
A.
Either the calculated value (Lucent uses 1.7dB for the Series II), or
B.
Measure the loss
1.
Key one radio and make a measurement in dBm at the front of the subrack with an HP
EPM-441A or equivalent power meter. Write the value down: _____ dBm.
2.
Disconnect the radio and move the power meter to the hatch plate.
3.
Key the same radio and make a measurement in dBm, and write it down: _____ dBm.
The difference between the two measurements is the loss.
4.
Determine the amount of power output at the rear of the subrack per carrier.
5.
Multiply the number of carriers times the output power level per carrier at the front of the subrack.
Three blank tables are provided on page 3 of this appendix for you to record your desired power
levels.
Hatch
Power
(w)
Convert Hatch Power
Loss from
Hatch to
Powerwave
Subrack (dB)
Power @ Powerwave
Subrack (dBm)
b=10*LOG(a / 0.001)
d=b+c
Analog
6.3
10*Log(6.3/0.001)=37.9934
1.7
CDMA*
21*
10*Log(21/0.001)=43.2222
CDPD
6.3
Setup
Inner
Tier
Formula
to dBm
Convert Powerwave Subrack No. of
Power to watts
Carriers
Total Power
per Signal
(watts)
e=x10(d/10)*0.001
g=ef
37.9934 + 1.7 = 39.6934 x10(39.9934/10)*0.001=9.318
10
93.1838
1.7
43.2222 + 1.7 = 44.9222 x10(44.9222/10)*0.001=31.06
13
62.1226
10*Log(6.3/0.001)=37.9934
1.7
37.9934 + 1.7 = 39.6934 x10(39.9934/10)*0.001=9.318
9.3184
6.3
10*Log(6.3/0.001)=37.9934
1.7
37.9934 + 1.7 = 39.6934 x10(39.9934/10)*0.001=9.318
9.3184
2.5
10*Log(2.5/0.001)=33.9794
1.7
33.9794 + 1.7 = 35.6794 x10(35.6794/10)*0.001=3.697
14.7911
Total
Power
188.7342
Example
*Some RF Engineers will give the power for Pilot Page and Sync (on the order of 2 to 5W). Powerwave
normally multiplies this value by 7 for the purpose of roughly calculating the CDMA channel with full
traffic load.
If the total output power level at the front of the Powerwave subrack exceeds the subrack’s specified
capability with the number of populated amplifiers:
Ø
Reduce the number of input radios until the subrack power rating is met.
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C-2 Power Setting Procedure:
Splitter
Example:
Single Analog Ch
Composite
~-1.7dB
5 to 20dB
Gain Avail.
MCPA
58.8dBg
Comb.
111mW
20.45dBm
29.59dBm
910mW
DC
11.09W
40.45dBm
7.5W
38.75dBm
49.59dBm
91W
47.89dBm
61.52W
Values in Boxes are given or known.
The remaining values are calculated
based on the given values.
Maximum composite input
level if gain is set to
maximum (20dB)
Figure C-1 Gain Block Example
1.
Set all transceiver levels to midrange output levels if this is a new base station installation. For
existing base stations, the levels may be left as they currently are set.
NOTE
The composite input level should not exceed -20dBm most applicatons.
Higher input levels may result in over-driving the MCR20830-1 amplifier
subrack. Refer to
Section 1 for individual model power specifications.
2.
Ensure all radios are not transmitting, including CDPD.
3.
Connect the power meter, with appropriate attenuators as necessary, to the transmit filter output
feed at the hatch plate.
4.
Set the GAIN CTRL to minimum gain (maximum attenuation). Refer to Section 1, Table 1-1 for
the dip switch truth table.
5.
Key one radio (usually this is the primary setup channel).
6.
Set the output level using the GAIN CTRL on the Powerwave subrack and transmitter gain adjustment for this single channel. Normally, the CDMA channel has the most limiting range, so this
is the best channel to start with, although most technicians normally start with the setup channel.
Try to keep the adjustments in the middle of the available range adjustments.
7.
Verify the power level is still correct.
8.
Unkey the radio.
9.
Key one radio at a time and set the power level of each individual radio at the hatch plate according to the calculations made in the first section above. Do not readjust the GAIN CTRL level.
10. Unkey all radios.
C-2.1 Overpower Verification
11. Connect the power meter, with appropriate attenuators as necessary, to the RF output of the
Powerwave subrack.
12. Reconnect the transmit filter output cable to the antenna.
044-05078 Rev. A
C-2
November 2000
Booster Amplifier Subrack System Integration Manual
â
13. Key all the radios and measure the total maximum power. This power level should not exceed the
rating for the MCR20830-1. If the power rating for the MCR20830-1 is exceeded, the intermodulation distortion performance of the amplifiers will suffer and the software-overpower
protection feature will activate.
NOTE:
Each amplifier will go into overdrive alarm when they are being
driven 3 dB over the rated power for that amplifier.
Each amplifier will shut down at 3 dB over the rated power, and
possibly cause the entire sector to be disabled.
Table C-1 Amplifier and Amplifier Subrack ratings
Amplifier
1 Module
2 Modules
60 Watt 47.8 dBm
52.3 W 47.18 dBm
91 W 49.52 dBm
*All measurements should be made with a calibrated power meter accurate within +2% (HP EPM-441A
or equivalent)
14. Disconnect all the radios.
15. Reconnect the RF output coax cable to the Powerwave subrack.
044-05078 Rev. A
C-3
November 2000
â
Hatch
Power
(w)
Formula
Booster Amplifier Subrack System Integration Manual
Convert Hatch Power Loss from Hatch Power @ Powerwave Convert Powerwave No. of
to Powerwave
Subrack (dBm)
Subrack Power to Carriers
to dBm
Subrack (dB)
watts
b=10*LOG(a / 0.001)
d=b+c
10
e=x (d/10)*0.001
Total Power per
Signal
(watts)
g=ef
Sector:
Total
Power
Hatch
Power
(w)
Formula
Convert Hatch Power Loss from Hatch Power @ Powerwave Convert Powerwave No. of
to Powerwave
Subrack (dBm)
Subrack Power to Carriers
to dBm
Subrack (dB)
watts
b=10*LOG(a / 0.001)
d=b+c
10
e=x (d/10)*0.001
Total Power per
Signal
(watts)
g=ef
Sector:
Total
Power
Hatch
Power
(w)
Formula
Convert Hatch Power Loss from Hatch Power @ Powerwave Convert Powerwave No. of
to Powerwave
Subrack (dBm)
Subrack Power to Carriers
to dBm
Subrack (dB)
watts
b=10*LOG(a / 0.001)
d=b+c
10
e=x (d/10)*0.001
Total Power per
Signal
Sector:
Total
Power
044-05078 Rev. A
C-4
November 2000
(watts)l
g=ef

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