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/\ /\ /\
PpyyzayyAYE.
TECHNOLOGIES
INSTALLATION & SERVICE
MCR3303-3-1 SUBRACK
MPA9600-25 AMPLIFIER
MULTICARRIER PCS
AMPLIFIER SYSTEM
1970-1990 MHz
25 T0 75 WATTS AVERAGE POWER
-60 dBc INTERMODULATION DISTORTION
27 October 1998
Powerwave Technologies, Inc. Tel: 949-757-0530
2026 McGaw Avenue Fax: 949-757-0941
Irvine, CA 92614 Web Site: www.pwav.com
044-05054 Rel B
2-1
2-2
2-3
2-4
2-5
2-6
2-7
3-1
3-2
44
4.3
44
4-5
46
4451
4-61
445.3
4-54
4-7
4-8
4-8.1
4-82
4-9
TABLE OF CONTENTS
Section 1 Page
General Description M
Introduction .....
General Descriptio
Functional and Physical Specifications.
Section 2
Installation
Introduction .....
Electrical Service Recommendations
Unpacking and Inspection
Installation Instructions .........................
Subrack Connectors J1 MON 1 Through J3 MON 3.
Subrack Connector J5 ...........
Amplifier Module Status, Alarm. Control, and Power Connector.
Section 3
Operating Instructions
Introduction .. .
Location and Function of Amplifier Module Controls and Indicators
Initial Start~Up and Operating Procedures ...................................
Section 4
Principles of Operation
Introduction
RF Input Signal
RF Output Load
System Functional Description
MCR3303—3-1 Subrack .....
MPA9600-25 Amplifier Module
Main Amplifier..
Error Amplifier..
Amplifier Monitoring
Amplifier Module Cooling
Power Distribution
lntermodulation
Two Tone Interrnodulation
Multitone Intermodulation
Alarms ........................
(MA-05054 Rem; ii
5-5.1
5-6.1
5-62
6-1
6-2
6-3
6-3. 1
6»3.2
TABLE OF CONTENTS (Continued)
Section 5 Page
Maintenance &
Introduction ...................................................................................................................... 5-1
Periodic Maintenance ................ 5-1
Test Equipment Required For Test
Cleaning Air InIets/Outlets
Performance Test .........
54
5-2
5-2
Amplifier System Performance Test. 5-2
Field Replaceable Parts and Module 5-6
MPA9600»25 Power Amplifier Modul 5-6
Cooling Fans ................. 5-6
Section 6
Troubleshooting
Introduction .....
Troubleshooting . 6-1
Retum for Service Procedure. 6-1
Obtaining an RMA
Repackaging for Shipmen
LIST OF ILLUSTRATIONS
MPA9600-25 Amplifier ............................................................................................
MCR3303-3-1 Subrack.
Subrack Rear Panel..
Connectors J1 MON 1 Through J3 MON 3.
Connector J5 ........................................
Amplifier Connector (on Rear of MPA9600-25 Module
Model MPA9600-25 Amplifier Module Control and Indicators.
MCR3303-3-1 Three Module Amplifier System ................
MPA9600—25 Power Amplifier Module Functional Block Diagra
Amplifier System Test Setup Diagram ............................................................................. 5-3
LIST OF TABLES
Page
Major System Components ...............
Multicarrier PCS Amplifier System Functional Specification
MCR3303-3-1 Subrack Power, Monitor, Control, and Input/Output Connectors,
Connectors J1 MON 1 Through J3 MON 3 Definition
Connector J5 Definition ..............
Amplifier Module Status, Alarm, Control, and Power Connections,
Amplifier Module Controls and Indicators.
Periodic Maintenance
Test Equipment Required.
Multicarrier PCS Amplifier System Test Data Shee
(wt-05054 Rev. B iii
GENERAL DESCRIPTION
1-1. INTRODUCTION
This manual contains information and procedures for installation, operation, and maintenance of
Powerwave‘s multicarrier PCS amplifier system, The manual is organized into six sections as
follows:
Section 1. General Description
Section 2. Installation
Section 3. Operating Instructions
Section 4. Principles of Operation
Section 5. Maintenance
Section 6. Troubleshooting
1-2. GENERAL DESCRIPTION
The MPA9600-25 amplifier (figure 1-1) is a linear, feed-forward power amplifier that operates in
the 20 MHz frequency band from 1970MHz to 1990MHz. The amplifier can simultaneously
transmit multiple frequencies, with better than -60 dBc third order intermodulation distortion (IMD),
The amplifier system is modular in design, and is ideally suited for use in AMPS/TDMAICDMA
base stations. The plug-in Model MPA9600-25 amplifier modules can each provide 25 watts of
power and function completely independently of each other. The amplifier modules are designed
for parallel operation to produce high peak power output and backup redundancy for remote
applications. The system is housed in the MCR3303-3-1 subrack (figure 1-2) which holds up to
three MPA9600-25 amplifiers to produce up to 75 watts output. 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 down-time. The tum-on and tum-off sequences of voltages are fully automatic. as
is overload protection and recycling. Inadvertent operator damage from Iront panel manipulation
is virtually impossible.
Notice
To comply with FCC regulations, no
channels existing withln 200 kHz spaclng
from the edges 0! any frequency block are to
be used for transmission.
The MCR3303-3-1 subrack contains an RF power splitter/combiner and a summary logic module
that monitors the functional status of all plug-in amplifiers. The rear panel of the subrack has the
044-05054 Rev. B 1-|
system RF IIO connectors. an RF output sample connector, and DC power input terminals. The
front panel of each amplifier module has unit level status/fault indicators and a power onloff circuit
breaker. Primary power for the amplifier system is s27 Vdc. Cooling for each plug-in amplifier
module is provided by two fans 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 ANDPHYSICAL SFECIFICA'HONS
Functional and physical specifications for the amplifier system are listed in table 1-2,
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 situafions
that would enhance this manual.
1-5. ORDERING INFORMATION
Table 1-1 following gives the part numbers and descriptions to be used when ordering either an
entire system or individual major components that comprise the system,
Table 1-1. Majors stem Components
SYSTEM DESCRIPTION OF SUB- QTY DESCRIPTION OF SUB-
ORDER SYSTEM NUMBER COMPONENT PER COMPONENT MODEL
NUMBER MODEL SYSTEM NUMBER
NUMBER
MCR3303—3—1 75 W 1970-1990 MHz PCS MPA9600—25 25 W 1970—1990 MHz PCS
System for Base Station
Equipment.
MCR3303-3—1 1 | 3-Way 17“ Subrack.
600-2294 1 | Front tan assembly, large.
| 800-00547-001 Front fan assembly, shall
| | accounts-om | 1 Realm assembly.
04405054 Rel/J! 1.2
H 1°}! 75050‘7170
S'l
\3 5 W SvOfock
MCRjfiO
W7?
Table 1-2. Multicarrier PCS Amplifier System Functional Specifications
Frequency Range
1970-1990 MHz
Total Maximum Input Power
0 dBm
Total Output Power (Minimum)
in MCR3303-3-1 System
25 Wtypical (1 Module)
50 W typical (2 Modules)
75 W typical (3 Modules)
Intermodulation Distortion
and In-Band Spurious:
1 Module : -60 dBc (Max) @ +24 to +28 Vdc @ 25 Watts
2 Modules: -60 dBc (Max) @ +24 to +25 Vdc @ 50 Watts
3 Modules: -60 (18: (Max) @ +24 to +28 Vdc @ 75 Watts
(-55 dBc(Min) @ +23 to +24 Vdc)
RF Gain at 1980 MHz
(without RF input filter)
59,51 0.5dB (1 Module) (without RF filter at input)
595: 0.5dB (2 Modules) (without RF filter at input)
5 5 10.5dB (3 Modules) (without RF filter at input)
Gain Flatness:
t 0.7 dB @ 27 Vdc i1Vdc
Gain Variation Over
Temperature:
t .o as @27 Vdct1Vdc
t 1.5 as @24t026Vdc
Output Protection:
Mismatch Protected
Input Port Return Loss: -14 dB (Min)
Harmonics: Better than -45 dBc _]
Out of Band Spurious: Better than -60 dBc
Duty Cycle: Continuous
DC Input Power: +27 Vdc 1 1 Vdc, 28 Amps Max per module @ 25 Watts
Operational +23 Vdc to 30 Vdc
Operating Temperature: 0 "C. to +50 "C.
Storage—Temperature: -40 ”C. to +85 °C.
Operating Humidity:
5°/n - 95% Relative Humidity (Non-Condensing)
Storage Humidity:
5% - 95 % Relative Humidig (Non-Condensing)
DC Input Connectors:
|_l
Threaded Studs, 5/16 - 18 thread.
Fan/Summag Alarm Connector:
Six position terminal block
RF Input Connector:
RF Output Connector:
SMA Female
Type "N’" Female“
RF Output Sample Connector:
SMA Female
Dimensions:
MPA9600—25 Amplifier
| MCR3303-3—1 Subrack:
1—1
15.72" High, 550" Vlflde, 16.74” Deep
15.72” High, 17.00” Wide,18.41" Deep (with input filter)
044-05054 Rcvi B
INSTALLATION
2-1. INTRODUCTION
This section contains installation recommendations. unpacking, inspection. and installation
instructions for the Multicarrier PCS Amplifier System. Carefully read all material in this section
prior to equipment unpacking or installation. Also read and review the operating procedures in
Section 3 prior to installing the equipment. Section 3 contains applicable standards imposed by
the Federal Communications Commission. It is important that the licensee perform these tasks
correctly and in good faith, Carefully read Parts 73 and 74 of the FCC rules to determine how
they apply to your installation. DON‘T TAKE CHANCES WITH YOUR LICENSE.
2-2. ELECTRICAL SERVICE RECOMMENDATIONS
Powenrvave 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
electn‘cal service must be well grounded,
Each amplifier system should have its own circuit breaker, so a failure in one does not shut off the
whole installation. Circuit breakers should be thermal type, capable of handling the anticipated
inrush current, in a load center with a master switch.
2-3. 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
open the containers and remove the subrack and amplifier modules. Remin all packing material
that can be reassembled in the event that the unit must be returned to the factory.
CAUTION
Exercise care in handling equipment
during inspection to prevent damage
caused by rough or careless handling.
Visually inspect the amplifier subrack and 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 connectors or fans. Inspect all connectors 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 for loss or damage may
not be withheld from any payment to Powemave, nor may any payment due be withheld pending
the outcome thereof. WE CANNOT GUARANTEE THE FREIGHT CARRIER'S PERFORMANCE.
044-05054 Rev. B 2-1
2-4. INSTALLATION INSTRUCTIONS
The MCR3303-34 19-inch subrack. which holds up to three amplifier modules, is designed for
installation in a rack or cabinet that permits access to the rear of the amplifier system for
connection of DC power, RF. and control and monitor cables. The location and function of the
system interface connectors are shown in figures 2-1. 2-2, and 2-3, and are described in tables
2-1, 2-2, and 2-3, The plug-in amplifier module connector is shown in figure 2-4 and is described
in table 24.
Table 2-1. MCR3303—3-1 Subrack Power. Monitor, Control, and Input/Output Connectors
FUNCTION
Input terminals for primary +27 Vdc source voltage and
its return.
15-pin female D—Sub connectors (refer to figure 2-2 and
table 2-2 for individual pin signals).
SMA female coax connector. RF output signal is at
4011.0dB of signal output to antenna.
25-pin female D—SUB connector (refer to figure 2-3 and
table 2-3 for individual pin signals).
Extended TYPE N female coax connector. Output to
antenna. Refer to table 1-2 for power output level of
one to three amplifier module systems.
SMA female coax connector, Refer to table 1-2 for
«ower input level to amplifier module s stem.
+27V and GND Terminals
J1 MON 1 thru J3 MON 3
Connectors
J4 - RF SAMPLE connector
3 | J5 CONTROL Connector
4 J6-RF OUT Connector
fl J7 RF IN Connector
To install the amplifier system proceed as follows:
1. install subrack in equipment rack or cabinet and secure in place with eight screws
2. Refer to figure 2-1 for the location of all subrack input/output connectors.
3. Connect control cable to J5 CONTROL connector on rear of subrack (refer to figure 2-2 and
table 2-2 for J5 definition).
4. Connect monitor cables for amplifiers 1 through 3 to connectors J1 MON 1 throth J1 MON 3
respectively on rear of subrack (refer to figure 2-3 and table 2-3 for J1 — J3 definition).
5. Connect antenna cable to JG-RF OUT connector on rear of subrack.
6. Connect transceiver or exciter output to the input terminal J7 RF IN on me rear of the sub-
rack.
7. if being used, connect the RF sampling cable to J4 RF SAMPLE,
MM
Turn off external primary Dc power before
connecting DC power cables.
8. Remove protective cover on power terminal block; do not discard. Connect positive primary
power to +27V terminal and negative primary power to GND terminal.
Replace protective cover on DC terminal
block. Failure to replace cover properly
could result in personal injury and
044-05054 Rev. B 2-2
damage to equipment in the event of a
short circuit,
044-05054 Rev. B 2-3
3 “Am VSOSO'VVO
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gagfi A, as ,i, 493; SB MLQ 7'
figure 2 / Spbmck Rom Demo;
CAUTION
Verify that all circuit breaker switches on the front
panels of the amplifiers are In the loft (OFF) position.
8. Install the plug-in amplifier modules in the slots of the subrack.
9. Check your work before applying DC voltage to the system. Make certain all connections are
tight and correct.
10. Measure primary DC input voltage. DC input voltage should be +27 Vdc 11.0 Vdc. If the DC
input voltage is above or below Hie limits. call and consult Powerwave before you turn on your
amplifier.
11 Refer to section 3 for initial tum-on and checkout procedures.
2-5. SUBRACK CONNECTORS J1 MON 1 THROUGH J3 MON 3
Connectors J1 MON 1 through J3 MON 3 on the rear of the MCR3303-3-1 subrack are 15-pin
female D»sub connectors that permit monitoring various alarm signals for each amplifier in the
subrack. Refer to figure 2-2 and table 2-2 for connector definition.
41
Figure 2-2. Connectors J1 MON 1 Through J3 MON 3
Table 2-2. Connectors J1 MON 1 Through J3 MON 3 Definition
Iilll suemu.
Ground
Over Power Fault
TTL Output
Normally low; high if over power fault
High Temp Fault
1'I'L Output
Normally low; high if high temp fault
VSWR Fault
TTL Output
Normally low; high if VSWR fault
DC Fault
TTL Output
Normally low; high if DC fault
Loop Fault
TTL Output
Normally low; high if loop fault
Low Power Fault
TTL Output
Normally low; high if low power fault
Fan Fault
TTL Output
Normally low; high if fan or fans fault
Ground
Fwd Mon
Analog Out
40 V @ 50 WE n power
Rev Mon
Analog Out
Ground pin for a high, float for a low
04443054 Rev. B
2-5
2-6. SUBRACK CONNECTOR J5
Connector J5 CONTROL on the rear of the MCR3303-3-1 subrack is a 25-pin female D-sub
connector that supports the RS-485 communications function. Refer to figure 2-3 and table 2-3
for connector definition.
Figure 2-3, Connector J5
Table 2- 3 Connector J5 Definition
mam-
RS485 RxD+
RS485 RXD—
RS485 TXD+
7-23
044-05054 Rev, B 2-6
2-7. AMPLIFIER MODULE STATUS, ALARM, CONTROL, AND POWER CONNECTOR
Each amplifier in the subrack has a separate remote alarm and control connector which may be
used by the host system to monitor and control the individual amplifier modules. The status.
alarm, control, and power connections on the amplifier connector are made through a 21-pin male
D‘Sub combo connector (figure 2-4) and are listed and described in table 24.
7 fiafiN
aaaornnn
Figure 2-4. Amplifier Connector (on Rear of MPA9600-25 Module)
Table 2-4. Amplifier Module Status, Alarm, Control. and Power Connections
PIN NUMBER
FUNCTION
DESCRIPTION
RF Input
Coaxial Contact
Power Input
+27 Vdc (Power Contact)
Ground
RF Output
Ground lPower Contact)
Coaxial Contact
Ground
Ground
NC (No Connection)
NC (No Connection)
NC (No Connedjon)
NC (No Connection)
NC (No Connection)
NC (No Connection)
Fan Fail
TTL signal normally low. A high level indicates that one or both of the
fans have failed.
Fonivard Power
Monitor
NC (No Connection)
Average Power Input
An analog DC signal representing the RF output power of the MCA,
The voltage is 4 volts z 100 mV at the maximum rated output power.
An analog DC voltage representing the average detected power of all
the MCAs in a rack. This voltage is derived lrorn dividing the sum of all
the lorward power voltages in a rack by the number at enabled MCAs.
This voltage is used by the MCA to determine a low power fault,
Summary Fault
NC (No Connection)
TTL signal normally low. A high level indicates that the MCA has been ,
disabled by a recurring alarm fault,
NC gNo Connection)
Module Deter:
Ground potential. Inlorms the rack that an MCA is plugged in.
Bias Input‘
‘I'I'L signal normally low for an enabled MCA. A high level will disable
the MCA
044—05054 Rev. B
FP Disable Output
TrL signal, low if the front panel switch is in the ON positi n. A high
level indicates the front panel switch in the OFF
2-7
OPERATING INSTRUCTIONS
3-1. INTRODUCTION
This section contains operating instructions for the Multicarrier PCS Amplifier System.
3-2. LOCATION AND FUNCTION OF AMPLIFIER MODULE CONTROLS AND INDICATORS.
The location of the plugin amplifier module controls and indicators is shown in figure 3—1. Their
funcfions are described in detail in table 3»1.
(<9 mm mu: 6ch we Rah 69
044-05054 Rev. B 3-1
Figure 3-1. MPA9600-25 Amplifier Module Controls and Indicators
044-05054 Rev. B 3-2
Table 3-1. Amplifier Module Control and Indicators
FUNCTION (Note: MPA = Multicarrier PCS Amplifier)
Indicator
Green LED. When lit, indicates that the 4-27 Vdc supply is greater than
+23 Vdc and less than +30 Vdc, The LED will blink if the voltage is
28 Vdc to 30 Vdc. If the +27 Vdc indicator goes out, the DC FAIL indi-
cator will illuminate, This indicates that the +27 Vdc voltage dropped
below +23 Vdc. A timer is started and the DC fail counter is incre-
mented. Alter five seconds the fault is analyzed and if it exists the
counter is incremented. If the count equals 25 before the timer
reaches 15 minutes, a summary fault will occur, the fault indicator will
latch on, and me MPA module will be disabled. 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 MPA will be disabled in-
stantaneously, as indicated by the illumination of the LPA DISAB. LED,
A timer is started and the DC fail counter is incremented. After five
seconds the voltage is measured. If the fault exism the counter is in-
cremented,’ If the count equals five before the timer reaches 15 min-
utes, a summary fault will occur, the fault indicator will latch on, and the
MPA module will remain disabled. If 15 minutes elapse before the
counter reaches five. the counter and timer will reset to zero.
2 +15VDC
Indicator
Green LED. When lit, indicates that the +15 Vdc supply is greater than
+14 Vdc and less than +16 Vdc. if the +15 Vdc indicator goes out, the
DC FAIL indicator will illuminate. This indicates that the +15 Vdc volt-
age dropped below +14 Vdc or increased above +16 Vdc. A timer is
started and the DC fail counter is incremented. Alter five seconds the
fault is analyzed and if it exists the counter is incremented.‘ If the
count equals 25 before the timer reaches 15 minutes, a summary fault
will occur, the fault indicator will latch on, and the MPA module will be
disabled. If 15 minutes elapse before the counter reaches 25, the
cou nter and timer will reset to zero.
3 +5VDC Indicator
Green LED. When lit, indicates that the +5 Vdc supply is greater than
+45 Vdc and less than +5.5 Vdc. If the +5 Vdc indicator goes out. the
DC FAIL indicator will illuminate. This indicates that the +5 Vdc voltage
dropped below +4.5 Vdc or increased above +55 Vdc. A timer is
started and the DC fail counter is incremented. After five seconds the
fault is analyzed and if it exists the counter is incremented.‘ If the
count equals 25 before the timer reaches 15 minutes, a summary fault
will occur, the fault indicator will latch on, and the MPA module will be
disabled. If 15 minutes elapse before the counter reaches 25, the
counter and timer will reset to zero,
-5VDC Indicator
044-05054 Rev. E
Green LED. When lit, indicates that the A5 Vdc supply is greater than
-5.5 Vdc and less than -4.5 Vdc. If the -5 Vdc indicator goes out, me
DC FAIL indicator will illuminate. This indicates that the —5 Vdc voltage
dropped below -5.5 Vdc or increased above —4.5 Vdc. Atimer is
started and the DC fail counter is incremented. After five seconds the
fault is analyzed and if it exists the counter is incremented.‘ If the
count equals 25 before the timer reaches 15 minutes, a summary fault
will occur, the fault indicator will latch on, and the MPA module will be
disabled. If 15 minutes elapse before the counter reaches 25, the
cou nter and timer will reset to zero.
3-3
NAME
FUNCTION (Note: MPA = Multicam'er PCS Amplifier)
RF ON Switch
Three position switch:
OFF (down position) - Turns off amplifier module.
ON (center position) - Normal amplifier on position.
RESET (up position) - When toggled to reset position, all the green
LED indicators will turn off and all the red LED indicators will illuminate
momentarily (LED test); this will also reset the fault latches. Then a se-
ries 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 re—
leased. If a fault occurs and the MPA is disabled. the alarms can be
cleared and the MPA enabled by this reset position. The functions of
the switch are disabled for five seconds after a power-up condition.
OVER PWR
Fault Indicator
Red LED. When lit. indicates the output power from the amplifier ex-
ceeded 50 watts. If an over power condition occurs the MPA is imme
diately disabled. A timer is started and the over power fault counter is
incremented, After five seconds the MPA is enabled and the fault is
analyzed. If the fault exists. the MPA is again disabled and the counter
is incremented.’ If the count equals five before the timer reaches 15
minutes, a summary fault will occur. the fault indicator will latch on. and
the MPA module will be disabled. Toggling the reset switch will enable
the MPA. If 15 minutes elapse before the counter reaches five. the
counter and timer will reset to zero.
HIGH TEMP
Fault Indicator
Red LED. When lit, indicates that the amplifier heat sink temperature
has exceeded 80 °C. If a high temp condition occurs a timer is started
and the high temp fault counter is incremented. After five seconds the
fault is analyxed. If the fault exists, the counter is incremented.‘ if the
count equals 25 before the timer reaches 15 minutes. a summary fault
will occur. the fault indicator will latch on, and the MPA module will be
disabled. Toggling the reset switch will enable the MPA. if 15 minutes
elapse before the counter reaches 25, the counter and timer will reset
to zero.
VSWR Fault
indicator
044-05054 Rev. B
Red LED, When lit, indicates that the reflected power detected at the
amplifier output exceeds 25 watts. If a VSWR condition occurs a timer
is started and the VSWR fault counter is incremented. After five sec-
onds the fault is analyzed. Ifthe fault exists. the counter is incre-
mented.‘ If the count equals 25 before the timer reaches 15 minutes.
a summary fault will occur, the fault indicator will latch on. and the MPA
module will be disabled. Toggling the reset switch will enable the MPA.
If 15 minutes elapse before the counter reaches 25. the counter and
timer will reset to zero.
3-4
FUNCTION (Note: MPA = Multicarrier PCS Amplifier)
DC FAIL Fault
Indicator
Red LED. When lit, indicates that one of the internal DC voltages
dropped below or exceeded the safe threshold level
(4-23 V<+27 V<+30 V, +14 V<+15 V<+16 V, +4.5 V<+5 V
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