Axcera LU5ATD User manual

INSTRUCTION MANUAL
Innovator
LX Series
Digital Power Amplifier
Assembly
AXCERA, LLC
103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA
[phone] •FAX [phone]
www.axcera.com •[email protected]

LX Series Digital Table of Contents
Power Amplifier Assembly
Volume 2, Rev. 1 June 15, 2006
i
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
SECTION PAGE
1.1 Manual Overview...................................................................................1-1
1.2 Assembly Designation Numbers ..............................................................1-1
1.3 Safety..................................................................................................1-2
1.4 Contact Information ......................................................................... 1-2
1.5 Material Return Procedure ......................................................................1-2
1.6 Limited One Year Warranty for Axcera Products........................................1-3
CHAPTER 2 AMPLIFIER ASSEMBLY DESCRIPTION, MAINTENANCE
& REMOTE CONTROL CONNECTIONS
2.1 LX Series Power Amplifier Chassis Assembly Overview .............................2-1
2.1.1 Power Amplifier Chassis Configurations...........................................2-3
2.1.1.1 125 Watt Power Amplifier Chassis Configuration.....................2-3
2.1.1.2 250 Watt Power Amplifier Chassis Configuration.....................2-3
2.1.1.3 500W Power Amplifier Chassis Configuration..........................2-3
2.1.2 System Configurations..................................................................2-4
2.1.2.1 125W, 250W or 500W System Configurations ........................2-4
2.1.2.2 1 kW System Configuration..................................................2-4
2.1.2.3 1.5 kW System Configuration ...............................................2-4
2.1.2.4 2 kW System Configuration..................................................2-5
2.1.2.5 2.5 kW System Configuration ...............................................2-5
2.1.2.6 3 kW System Configuration..................................................2-6
2.1.3 Power Amplifier Module Assembly, 250W........................................2-8
2.1.4 Power Supply Module Assembly...................................................2-10
2.1.5 Front Panel LCD Display Screens..................................................2-10
2.2 External Assembly...............................................................................2-10
2.2.1 Visual/Aural Metering Board ........................................................2-10
2.3 System Operation................................................................................2-10
2.3.1 Principles of Operation................................................................2-11
2.4 Maintenance .......................................................................................2-12
2.5 Customer Remote Connections....................................................... 2-12
CHAPTER 3 SITE CONSIDERATIONS, INSTALLATION AND SETUP PROCEDURES
3.1 Site Considerations................................................................................3-1
3.2 Unpacking the Chassis w/Modules and bandpass filter...............................3-5
3.3 Installing the Chassis w/Modules and filters..............................................3-5
3.4 AC Input...............................................................................................3-6
3.5 Setup and Operation..............................................................................3-7
3.5.1 Input Connections........................................................................3-7
3.5.2 Initial Turn On .............................................................................3-8
3.5.2.1 DM8 Digital Modulator Module LEDs on Front Panel.................3-8
3.5.2.2 IF Processor Module LEDs on Front Panel...............................3-8
3.5.2.3 VHF/UHF Upconverter Module LEDs on Front Panel .................3-8
3.5.2.4 Controller Module LEDs on Front Panel ..................................3-9
3.5.2.5 Power or Driver Amplifier Module LEDs on Front Panel ............3-9
3.5.3 Front Panel Screens for the Exciter/Amplifier Chassis Assembly.........3-9
3.5.4 Operation Procedure.....................................................................3-9

LX Series Digital Table of Contents
Power Amplifier Assembly
Volume 2, Rev. 1 June 15, 2006
ii
TABLE OF CONTENTS -(Continued)
SECTION PAGE
CHAPTER 4 CIRCUIT DESCRIPTIONS
Power Amplifier Chassis Assembly..........................................................4-1
4.1 Power Amplifier Module..........................................................................4-1
4.1.1 UHF Phase/Gain Board..................................................................4-1
4.1.2 150 Watt Driver Pallet Assembly....................................................4-2
4.1.3 150 Watt Driver, Dual Output Board...............................................4-2
4.1.4 UHF Module Assembly, RF Module Pallet, Philips ..............................4-2
4.1.5 2 Way UHF Combiner Assembly.....................................................4-3
4.1.6 Amplifier Control Board.................................................................4-3
4.2 Power Supply Assembly .........................................................................4-5
4.3 External Assembly.................................................................................4-5
4.3.1 Dual Peak Detector Board .............................................................4-5
APPENDICES
APPENDIX A INNOVATOR LX SERIES SPECIFICATIONS
APPENDIX B DRAWINGS AND PARTS LISTS
APPENDIX C TRANSMITTER LOG SHEET

LX Series Digital Table of Contents
Power Amplifier Assembly
Volume 2, Rev. 1
iii
LIST OF FIGURES
FIGURE PAGE
1-1Brady Marker Identification Drawing.................................................1-1
2-1500W Digital Power Amplifier Assembly Racking Plan.........................2-3
3-11 kW Minimum Ventilation Configuration...........................................3-4
3-2Front and Rear View Exciter/Driver...................................................3-5
3-3Front and Rear View 76” Cabinet Typical 2kW Configuration ...............3-6
3-4AC Input Box Assembly...................................................................3-6
3-5Rear View of LX Series Transmitter ..................................................3-7
4-1125 Watt Digital UHF Amplifier Module .............................................4-2

LX Series Digital Table of Contents
Power Amplifier Assembly
Volume 2, Rev. 1
iv
LIST OF TABLES
TABLE PAGE
2-1Typical LX Series Digital System Drawings and Parts Lists ..................2-4
2-2LX Series Power Amplifier Chassis Assemblies ...................................2-8
2-3Power Amplifier Status Indicators.....................................................2-9
2-4Power Amplifier Control Adjustments................................................2-9
2-5Power Amplifier Sample ..................................................................2-9
2-6LX Series Customer Remote Connections.................................2-13
2-7(Optional) Exciter Switcher Customer Remote Connections.... 2-15
3-1LX Series Digital Transmitters AC Input and Current Requirements......3-1
3-2Rear Chassis Connections for LX Series Transmitter...........................3-7

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-1
Chapter 1
Introduction
1.1 Manual Overview
This manual explains the installation,
setup, alignment, and maintenance
procedures for the Power Amplifier
Assembly for the Innovator LX Series
transmitter. Information and drawings
on the exciter/driver assembly are
contained in Volume 1. It is important
that you read all of the instructions,
especially the safety information in this
chapter, before you begin to install or
operate the unit.
This instruction manual is divided into five
chapters and supporting appendices.
Chapter 1, Introduction, contains
information on the assembly numbering
system used in the manual, safety,
maintenance, return procedures, and
warranties. Chapter 2, Amplifier
Assembly Description, Maintenance &
Remote Control Connections, describes
the amplifier assembly and includes
discussions on control and status
indicators and remote control connections.
Chapter 3, Site Considerations,
Installation and Setup Procedures,
explains how to unpack, install, setup, and
operate the power amplifier assembly.
Chapter 4, Circuit Descriptions, contains
circuit level descriptions for boards and
board level components in the power
amplifier. Appendix A contains system
specifications. Appendix B contains
drawings and parts lists. Appendix C
contains a transmitter log sheet.
1.2 Assembly Designators
Axcera has assigned assembly numbers,
Ax designations such as A1, where
x=1,2,3…etc, to all assemblies, modules,
and boards in the system. These
designations are referenced in the text of
this manual and shown on the block
diagrams and interconnect drawings
provided in the appendices. The Block
Diagrams, Interconnects, Schematics,
Assembly Drawings and Parts Lists are
arranged in increasing numerical order in
the appendices. Section titles in the text
for assembly or module descriptions or
alignment procedures contain the
associated part number(s) and the
relevant appendix that contains the
drawings for that item.
The cables that connect between the
boards within a tray or assembly and
that connect between the trays, racks
and cabinets are labeled using Brady
markers. Figure 1-1 is an example of a
Brady marked cable. There may be as
few as two or as many as four Markers
on any one cable. These Brady markers
are read starting furthest from the
connector. If there are four Brady
Markers, this marker is the transmitter
number such as transmitter 1 or
transmitter 2. The next or the furthest
Brady Marker is the rack or cabinet
number on an interconnect cable or the
board number within a tray. The next
number on an interconnect cable is the
Tray location or number. The Brady
marker closest to the connector is the
jack or connector number on an
interconnect cable or the jack or
connector number on the board within a
tray.
Figure 1-1 Brady Marker Identification Drawing

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-2
1.3 Safety
The UHF transmitter systems
manufactured by Axcera are designed to
be easy to use and repair while providing
protection from electrical and mechanical
hazards. Please review the following
warnings and familiarize yourself with the
operation and servicing procedures
before working on the transmitter
system.
Read All safety Instructions – All of
the safety instructions should be read
and understood before operating this
equipment.
Retain Manuals – The manuals for the
transmitter should be retained at the
transmitter site for future reference.
Axcera provides two sets of manuals for
this purpose; one set can be left at the
office while one set can be kept at the
site.
Heed all Notes, Warnings, and
Cautions – All of the notes, warnings,
and cautions listed in this safety section
and throughout the manual must be
followed.
Follow Operating Instructions – All of
the operating and use instructions for the
transmitter should be followed.
Cleaning – Unplug or otherwise
disconnect all power from the equipment
before cleaning. Do not use liquid or
aerosol cleaners. Use a damp cloth for
cleaning.
Ventilation – Openings in the cabinet
and module front panels are provided for
ventilation. To ensure the reliable
operation of the driver/transmitter, and
to protect the unit from overheating,
these openings must not be blocked.
Servicing – Do not attempt to service
this product yourself until becoming
familiar with the equipment. If in doubt,
refer all servicing questions to qualified
Axcera service personnel.
Replacement Parts – When
replacement parts are used, be sure that
the parts have the same functional and
performance characteristics as the
original part. Unauthorized substitutions
may result in fire, electric shock, or other
hazards. Please contact the Axcera
Technical Service Department if you have
any questions regarding service or
replacement parts.
1.4 Contact Information
The Axcera Field Service Department can
be contacted by phone at (724) 873-
8100 or by fax at [phone].
Before calling Axcera, please be prepared
to supply the Axcera technician with
answers to the following questions. This
will save time and help ensure the most
direct resolution to the problem.
1. What are the Customers’ Name
and call letters?
2. What are the model number and
type of transmitter?
3. Is the transmitter digital or
analog?
4. How long has the transmitter
been on the air? (Approximately
when was the transmitter
installed.)
5. What are the symptoms being
exhibited by the transmitter?
Include the current control/power
supply LCD readings and the
status of LEDs on the front
panels of the modules. If
possible, include the
control/power supply LCD
readings before the problem
occurred.
1.5 Return Material Procedure
To insure the efficient handling of
equipment or components that have been
returned for repair, Axcera requests that
each returned item be accompanied by a
Return Material Authorization Number
(RMA#).

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-3
The RMA# can be obtained from any
Axcera Field Service Engineer by
contacting the Axcera Field Service
Department at [phone] or by fax
at [phone]. This procedure
applies to all items sent to the Field
Service Department regardless of
whether the item was originally
manufactured by Axcera.
When equipment is sent to the field on
loan, an RMA# is included with the unit.
The RMA# is intended to be used when
the unit is returned to Axcera. In
addition, all shipping material should be
retained for the return of the unit to
Axcera.
Replacement assemblies are also sent
with an RMA# to allow for the proper
routing of the exchanged hardware.
Failure to close out this type of RMA# will
normally result in the customer being
invoiced for the value of the loaner item
or the exchanged assembly.
When shipping an item to Axcera, please
include the RMA# on the packing list and
on the shipping container. The packing
slip should also include contact
information and a brief description of why
the unit is being returned.
Please forward all RMA items to:
AXCERA, LLC
103 Freedom Drive
P.O. Box 525
Lawrence, PA 15055-0525 USA
For more information concerning this
procedure, call the Axcera Field Service
Department @ [phone].
Axcera can also be contacted through e-
mail at [email protected] and on the
Web at www.axcera.com.
1.6 Limited One Year Warranty for
Axcera Products
Axcera warrants each new product that
it has manufactured and sold against
defects in material and workmanship
under normal use and service for a
period of one (1) year from the date of
shipment from Axcera's plant, when
operated in accordance with Axcera's
operating instructions. This warranty
shall not apply to tubes, fuses,
batteries, bulbs or LEDs.
Warranties are valid only when and if
(a) Axcera receives prompt written
notice of breach within the period of
warranty, (b) the defective product is
properly packed and returned by the
buyer (transportation and insurance
prepaid), and (c) Axcera determines, in
its sole judgment, that the product is
defective and not subject to any misuse,
neglect, improper installation,
negligence, accident, or (unless
authorized in writing by Axcera) repair
or alteration. Axcera's exclusive liability
for any personal and/or property
damage (including direct, consequential,
or incidental) caused by the breach of
any or all warranties, shall be limited to
the following: (a) repairing or replacing
(in Axcera's sole discretion) any
defective parts free of charge (F.O.B.
Axcera’s plant) and/or (b) crediting (in
Axcera's sole discretion) all or a portion
of the purchase price to the buyer.
Equipment furnished by Axcera, but not
bearing its trade name, shall bear no
warranties other than the special hours-
of-use or other warranties extended by
or enforceable against the manufacturer
at the time of delivery to the buyer.
NO WARRANTIES, WHETHER
STATUTORY, EXPRESSED, OR
IMPLIED, AND NO WARRANTIES OF
MERCHANTABILITY, FITNESS FOR
ANY PARTICULAR PURPOSE, OR
FREEDOM FROM INFRINGEMENT,
OR THE LIKE, OTHER THAN AS
SPECIFIED IN PATENT LIABILITY
ARTICLES, AND IN THIS ARTICLE,
SHALL APPLY TO THE EQUIPMENT
FURNISHED HEREUNDER.

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-4
!
!!
!WARNING!!!
"
""
"HIGH VOLTAGE #
##
#
DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS
YOU ARE FAMILIAR WITH ITS OPERATION AND EXPERIENCED IN
SERVICING HIGH VOLTAGE EQUIPMENT. LETHAL VOLTAGES ARE PRESENT
WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF
POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM.
$
$$
$RADIO FREQUENCY RADIATION HAZARD $
$$
$
MICROWAVE, RF AMPLIFIERS AND TUBES GENERATE HAZARDOUS RF
RADIATION THAT CAN CAUSE SEVERE INJURY INCLUDING CATARACTS,
WHICH CAN RESULT IN BLINDNESS. SOME CARDIAC PACEMAKERS MAY BE
AFFECTED BY THE RF ENERGY EMITTED BY RF AND MICROWAVE
AMPLIFIERS. NEVER OPERATE THE TRANSMITTER SYSTEM WITHOUT A
PROPERLY MATCHED RF ENERGY ABSORBING LOAD ATTACHED. KEEP
PERSONNEL AWAY FROM OPEN WAVEGUIDES AND ANTENNAS. NEVER
LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA. MONITOR ALL PARTS OF
THE RF SYSTEM FOR RADIATION LEAKAGE AT REGULAR INTERVALS.

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-5
EMERGENCY FIRST AID INSTRUCTIONS
Personnel engaged in the installation, operation, or maintenance of this equipment are urged to become
familiar with the following rules both in theory and practice. It is the duty of all operating personnel to be
prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.
RESCUE BREATHING
1. Find out if the person is
breathing.
You must find out if the person
has stopped breathing. If you
think he is not breathing, place
him flat on his back. Put your ear
close to his mouth and look at his
chest. If he is breathing you can
feel the air on your cheek. You
can see his chest move up and
down. If you do not feel the air
or see the chest move, he is not
breathing.
2. If he is not breathing, open
the airway by tilting his head
backwards.
Lift up his neck with one hand
and push down on his forehead
with the other. This opens the
airway. Sometimes doing this will
let the person breathe again by
himself.
3. If he is still not breathing,
begin rescue breathing.
-Keep his head tilted backward.
Pinch nose shut.
-Put your mouth tightly over his
mouth.
-Blow into his mouth once every
five seconds
-DO NOT STOP rescue breathing
until help arrives.
LOOSEN CLOTHING - KEEP
WARM
Do this when the victim is
breathing by himself or help is
available. Keep him as quiet as
possible and from becoming
chilled. Otherwise treat him for
shock.
BURNS
SKIN REDDENED: Apply ice cold water to burned
area to prevent burn from going deeper into skin
tissue. Cover area with a clean sheet or cloth to
keep away air. Consult a physician.
SKIN BLISTERED OR FLESH CHARRED: Apply
ice cold water to burned area to prevent burn from
going deeper into skin tissue.
Cover area with clean sheet or cloth to keep away
air. Treat victim for shock and take to hospital.
EXTENSIVE BURN - SKIN BROKEN: Cover area
with clean sheet or cloth to keep away air. Treat
victim for shock and take to hospital.

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-6
dBm, dBw, dBmV, dBµ
µµ
µV, & VOLTAGE
EXPRESSED IN WATTS
50 Ohm System
WATTS PREFIX dBm dBw dBmV dBµV VOLTAGE
1,000,000,000,000 1 TERAWATT +150 +120
100,000,000,000 100 GIGAWATTS +140 +110
10,000,000,000 10 GIGAWATTS +130 +100
1,000,000,000 1 GIGAWATT +120 + 99
100,000,000 100 MEGAWATTS +110 + 80
10,000,000 10 MEGAWATTS +100 + 70
1,000,000 1 MEGAWATT + 90 + 60
100,000 100 KILOWATTS + 80 + 50
10,000 10 KILOWATTS + 70 + 40
1,000 1 KILOWATT + 60 + 30
100 1 HECTROWATT + 50 + 20
50 + 47 + 17
20 + 43 + 13
10 1 DECAWATT + 40 + 10
1 1 WATT + 30 0 + 77 +137 7.07V
0.1 1 DECIWATT + 20 - 10 + 67 +127 2.24V
0.01 1 CENTIWATT + 10 - 20 + 57 +117 0.707V
0.001 1 MILLIWATT 0 - 30 + 47 +107 224mV
0.0001 100 MICROWATTS - 10 - 40
0.00001 10 MICROWATTS - 20 - 50
0.000001 1 MICROWATT - 30 - 60
0.0000001 100 NANOWATTS - 40 - 70
0.00000001 10 NANOWATTS - 50 - 80
0.000000001 1 NANOWATT - 60 - 90
0.0000000001 100 PICOWATTS - 70 -100
0.00000000001 10 PICOWATTS - 80 -110
0.000000000001 1 PICOWATT - 90 -120
TEMPERATURE CONVERSION
°
°°
°F = 32 + [(9/5) °
°°
°C]
°
°°
°C = [(5/9) (°
°°
°F - 32)]

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-7
USEFUL CONVERSION FACTORS
TO CONVERT FROM TO MULTIPLY BY
mile (US statute) kilometer (km) 1.609347
inch (in) millimeter (mm) 25.4
inch (in) centimeter (cm) 2.54
inch (in) meter (m) 0.0254
foot (ft) meter (m) 0.3048
yard (yd) meter (m) 0.9144
mile per hour (mph) kilometer per hour(km/hr) 1.60934
mile per hour (mph) meter per second (m/s) 0.44704
pound (lb) kilogram (kg) 0.4535924
gallon (gal) liter 3.7854118
U.S. liquid
(One U.S. gallon equals 0.8327 Canadian gallon)
fluid ounce (fl oz) milliliters (ml) 29.57353
British Thermal Unit watt (W) 0.2930711
per hour (Btu/hr)
horsepower (hp) watt (W) 746
NOMENCLATURE OF FREQUENCY BANDS
FREQUENCY RANGE DESIGNATION
3 to 30 kHz VLF - Very Low Frequency
30 to 300 kHz LF - Low Frequency
300 to 3000 kHz MF - Medium Frequency
3 to 30 MHz HF - High Frequency
30 to 300 MHz VHF - Very High Frequency
300 to 3000 MHz UHF - Ultrahigh Frequency
3 to 30 GHz SHF - Superhigh Frequency
30 to 300 GHz EHF - Extremely High Frequency
LETTER DESIGNATIONS FOR UPPER FREQUENCY
BANDS
LETTER FREQ.BAND
L 1000 - 2000 MHz
S 2000 - 4000 MHz
C 4000 - 8000 MHz
X 8000 - 12000 MHz
Ku 12-18GHz
K 18-27GHz
Ka 27-40GHz
V 40-75GHz
W 75 - 110 GHz

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-8
RETURN LOSS VS. VSWR
1.001 1.01 1.1 2.0
VSWR
0
-10
-20
-30
-40
-50
-60
-70
R
E
T
U
R
N
L
O
S
S
dB

LX Series Digital Chapter 1, Introduction
Power Amplifier Assembly
Volume 2, Rev. 1 1-9
ABBREVIATIONS/ACRONYMS
AC Alternating Current
AFC Automatic Frequency Control
ALC Automatic Level Control
AM Amplitude modulation
AGC Automatic Gain Control
AWG American wire gauge
BER Bit Error Rate
BW Bandwidth
DC Direct Current
D/A Digital to analog
DTV Digital Television
dB Decibel
dBm Decibel referenced to 1 milliwatt
dBmV Decibel referenced to 1 millivolt
dBw Decibel referenced to 1 watt
FEC Forward Error Correction
FM Frequency modulation
Hz Hertz
ICPM Incidental Carrier Phase Modulation
I/P Input
IF Intermediate Frequency
LED Light emitting diode
LSB Lower Sideband
MPEG Motion Pictures Expert Group
O/P Output
PLL Phase Locked Loop
PCB Printed circuit board
QAM Quadrature Amplitude Modulation
SMPTE Society of Motion Picture and
Television Engineers
VSB Vestigial Side Band

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-1
Chapter 2
Amplifier Assembly Description, Maintenance
& Remote Control Connections
2.1 LX Series Power Amplifier Chassis
Assembly Overview
The power amplifier chassis assembly in
the LX Series contains modular television
amplifiers that slide into the assembly
each producing approximately 125 Watts
Digital output. There is also needed one
external Power Supply Module Assembly
for every two 125 Watt PA modules, which
also slide into the Power Amplifier Chassis
Assembly, under the PA Modules. One
On/Off circuit breaker, mounted on the
rear of the power amplifier assembly,
supplies AC to each power supply
assembly. Four PA modules and two
Power Supply modules are the maximum
number of modules in one Power Amplifier
Chassis Assembly producing 500W Digital
output power. Two Power Amplifier
Chassis Assemblies are required for 1 kW
digital output power, three Power
Amplifier Chassis Assemblies for 1.5 kW
digital, four Power Amplifier Chassis
Assemblies for 2 kW digital, five Power
Amplifier Chassis Assemblies for 2.5 kW
digital, and six Power Amplifier Chassis
Assemblies are required for 3 kW digital
output power.
In a 125W digital system the RF output of
the exciter/driver at the “N” connector J25
connects to the (A3) power amplifier
chassis assembly at the “N” connector
J201.
In a 250W or 500W digital system the RF
output of the exciter/driver at the “N”
connector J25 connects to the (A3) power
amplifier chassis assembly at the “N”
connector J200.
In a 1 kW digital system the RF output of
the exciter/driver connects to (A5) a 2
Way Splitter Assembly. The two outputs
of the splitter connect to the (A3) and
(A6) power amplifier chassis assemblies at
J200.
In a 1.5 kW digital system the RF output
of the exciter/driver connects to (A5) a 4
Way Splitter Assembly. Three outputs of
the splitter, the fourth at J5 is 5 Watt
terminated, connect to the (A3), (A6)
and (A13) power amplifier chassis
assemblies at J200.
In a 2 kW digital system there are two
cabinet assemblies (A1 and A2). The
(A1) cabinet assembly contains the (A1-
A27) exciter/driver assembly and the
(A1-A6 and A1-A3) Power Amplifiers.
The (A2) cabinet assembly contains the
(A2-A6 and A2-A3) Power Amplifiers.
The RF output of the exciter/driver
connects to (A1-A5) a 4 Way Splitter
Assembly. Three outputs of the splitter
at J2, J4 and J5 connect to the (A1-A3),
(A2-A6) and (A2-A3) power amplifier
chassis assemblies at J200. The fourth
output of the splitter at J1 is connected
through A1-A5-A1, a phase matching
line, before it is connected to the input of
the (A1-A6) Power Amplifier.
In a 2.5 kW digital system there are two
cabinet assemblies (A1 and A2). The
(A1) cabinet assembly contains the (A1-
A27) exciter/driver assembly and the
(A1-A6 and A1-A3) Power Amplifiers.
The (A2) cabinet assembly contains the
(A2-A6, A2-A3 and A2-A13) Power
Amplifiers. The RF output of the
exciter/driver at J25 connects to (A1-A5-
A1) a 2 Way Splitter Assembly. One
output of the splitter connects to (A2-A5)
a 4 way splitter in the (A2) cabinet and
the other output connects to (A1-A5-A2)
a 4 way splitter in the (A1) cabinet. Two
of the outputs of the (A1-A5-A2) splitter
at J1, and J5 connect to the (A1-A3) and
(A1-A6) power amplifier chassis
assemblies at J200. The third and fourth
output of the (A1-A5-A2) splitter at J2
and J4 are terminated. The other output
of the (A1-A5-A1) 2 Way Splitter at J2

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-2
connects to the (A2) cabinet at J3 of (A2-
A5) a 4 way splitter. Three of the outputs
of the (A2-A5) splitter at J1, J2 and J4
connect to the (A1-A3), (A1-A6) and (A1-
A13) power amplifier chassis assemblies
at J200. The other output of the (A2-A5)
splitter at J4 is terminated.
In a 3 kW digital system there are two
cabinet assemblies (A1 and A2). The (A1)
cabinet assembly contains the (A1-A27)
exciter/driver assembly and the (A1-A6,
A1-A3, and A1-A13) Power Amplifiers.
The (A2) cabinet assembly contains the
(A2-A6, A2-A3, and A2-A13) Power
Amplifiers. The RF output of the
exciter/driver at J25 connects to (A1-A5-
A1) a 2 Way Splitter Assembly. One
output of the splitter connects to (A2-A5)
a 4 way splitter in the (A2) cabinet and
the other output connects to (A1-A5-A2) a
4 way splitter in the (A1) cabinet. Three
of the outputs of the (A1-A5-A2) splitter
at J1, J2 and J4 connect to the (A1-A3),
(A1-A6) and (A1-A13) power amplifier
chassis assemblies at J200. The fourth
output of the (A1-A5-A2) splitter at J5 is
terminated. The other output of the (A1-
A5-A1) splitter at J2 connects to the (A2)
cabinet at J3 of (A2-A5) a 4 way splitter.
Three of the outputs of the (A2-A5)
splitter at J1, J2, and J4 connect to the
(A2-A3), (A2-A6), and (A2-A13) power
amplifier chassis assemblies at J200. The
other output of the (A2-A5) splitter at J5
is terminated.
Data and control information for the
system is fed through the system serial
cable. In a 125W, 250W or 500W digital
system, the system serial cable connects
from J34 on the exciter/driver assembly to
J232 on the (A3) Power Amplifier
Assembly.
In a 1 kW digital system, the system
serial cable connects from J34 on the
exciter/driver assembly to J232 on the
(A3) Power Amplifier Assembly. The serial
cable then connects from J233 on the
(A3) power amplifier to J232 on the (A6)
power amplifier.
In a 1.5 kW digital system, the system
serial cable connects from J34 on the
exciter/driver assembly to J232 on the
(A3) Power Amplifier Assembly. The
serial cable then connects from J233 on
the (A3) power amplifier to J232 on the
(A6) power amplifier and from J233 on
the (A6) power amplifier to J232 on the
(A13) power amplifier.
In a 2 kW digital system, the system
serial cable connects from J34 on the
exciter/driver assembly to J232 on the
(A1-A3) Power Amplifier Assembly. The
serial cable then connects from J233 on
the (A1-A3) power amplifier to J232 on
the (A1-A6) power amplifier. The serial
cable next connects from J233 on (A1-
A6) to J233 on the (A2-A3) power
amplifier and then from J233 on the (A2-
A3) power amplifier to J232 on the (A2-
A6) power amplifier.
In a 2.5 kW digital system, the system
serial cable connects from J34 on the
exciter/driver assembly to J232 on the
(A1-A3) Power Amplifier Assembly. The
serial cable then connects from J233 on
the (A1-A3) power amplifier to J232 on
the (A1-A6) power amplifier. The serial
cable next connects from J233 on (A1-
A6) to J232 on the (A2-A3) power
amplifier. The serial cable next connects
from J233 on (A2-A3) to J232 on the
(A2-A6) power amplifier and then from
J233 on the (A2-A6) power amplifier to
J232 on the (A2-A13) power amplifier.
In a 3 kW digital system, the system
serial cable connects from J34 on the
exciter/driver assembly to J232 on the
(A1-A3) Power Amplifier Assembly. The
serial cable then connects from J233 on
the (A1-A3) power amplifier to J232 on
the (A1-A6) power amplifier. The serial
cable next connects from J233 on (A1-
A6) to J232 on the (A1-A13) power
amplifier. The serial cable next connects
from J233 on (A1-A13) to J232 on the
(A2-A3) power amplifier and then from
J233 on the (A2-A3) power amplifier to
J232 on the (A2-A6) power amplifier.
Finally the serial cable connects from

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-3
J233 on (A2-A6) to J232 on (A2-A13)
power amplifier.
2.1.1 Power Amplifier Chassis
Configurations
In the 125W digital power amplifier
chassis assembly the RF from J201
connects to the OSP Jack J111 in the
power amplifier assembly. In the power
amplifier chassis assemblies above 250W,
the RF from J200 connects to the SMA
Jack J100 on the 4 way splitter assembly.
The 4 outputs, in a 1 kW amplifier power
amplifier assembly, connect through the
output SMA jacks to OSP input jacks of
the four slide in power amplifier module
assemblies. J101 connects to jack J111
on power amplifier #1. J102 connects to
jack J121 on power amplifier #2. J103
connects to jack J131 on power amplifier
#3. J104 connects to jack J141 on power
amplifier #4.
2.1.1.1 125 Watt Digital Power Amplifier
Chassis Configuration
In a 125 Watt digital power amplifier
chassis assembly, the RF input at J201 is
connected to J111 on the power amplifier
module. The output of the power
amplifier at J112 connects to the RF
output jack J203 of the power amplifier
chassis assembly.
2.1.1.2 250 Watt Digital Power Amplifier
Chassis Configuration
In a 250 Watt digital power amplifier
chassis assembly, Jacks J103 and J104,
on the 4 way splitter assembly, are not
used and are terminated with 50Ω. Also,
the power amplifier modules #3 and #4
are not used. Finally a 2 way combiner is
used in place of the 4 way combiner.
2.1.1.3 500W Digital Power Amplifier
Chassis Configuration
In a 500W digital amplifier power
amplifier assembly, the output OSP jacks
connect to the OSP input jacks on the
four way combiner assembly. J112
connects to J151 on the 4 way combiner.
J122 connects to J152 on the 4 way
combiner power amplifier #2. J132
connects to J153 on the 4 way combiner.
J142 connects to J154 on the 4 way
combiner.
Figure 2-1. 500W Digital Power Amplifier
Assembly Racking Plan
In a 500W digital amplifier power
amplifier assembly, the (A5) power
supply #1 provides voltages to the (A1)
power amplifier #1 and the (A3) power
amplifier #3 assemblies and the (A6)
power supply #2 provides voltages to the
(A2) power amplifier #2 and the (A4)
power amplifier #4.

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-4
2.1.2 System Configurations
Table 2-1: Typical LX Series Digital System Configuration Drawings and Parts Lists
DIGITAL SYSTEM
CONFIGURATIONS INTERCONNECT RACKING PLAN PARTS LIST
125W 1303940 1303596 1303913
250W 1303940 1303596 1303893
500W 1303940 1303596 1303894
1 kW 1303941 1303596 1303895
NOTE: Refer to Table 2-1 for the
Interconnect, Racking Plan and Parts
List Numbers for your system. The
actual drawings and parts lists are
located in Appendix B of this manual.
A Drawing List of the order the
drawings appear in the Appendix is
found at the beginning of the section.
2.1.2.1 125 Watt, 250 Watt or 500W
Digital Output System Configurations
In a 125 Watt digital system, the output
of the (A3) power amplifier chassis
assembly at the 7/16” connector J203 is
cabled to (A9) the bandpass filter for the
system. In a 250 Watt or 500W digital
system, the output of the (A3) power
amplifier chassis assembly at the 7/16”
connector J205 is also cabled to the (A9)
bandpass filter. The filtered output
connects either directly to (A11) the
output coupler or first to the Optional 1
section or 2 section trap filter if more
filtering is needed and then to the output
coupler. The (A11) coupler assembly
supplies a forward and a reflected power
samples to the (A4) Dual Peak Detector
Board. The Dual Peak Detector Board
supplies reflected and forward output
power samples to the exciter/driver for
metering purposes. The reflected sample
connects to TB31-13 and the forward
sample at TB31-14. The RF output for the
transmitter is at J2 the 7/8” EIA connector
on the (A11) coupler assembly.
2.1.2.2 1 kW Digital Output System
Configuration
In a 1 kW digital system, the output of the
(A3) and the (A6) power amplifier chassis
assemblies, at the “7/16” connectors
J205, are cabled to (A7) the hybrid
combiner for the system, mounted to the
input of the bandpass filter. A 500 Watt
reject load (A9) connects to J4 on the
hybrid combiner to dissipate reject
power. A thermal switch (A9-A1) is
mounted to the reject load and supplies
an overtemperature fault, at 175º F., to
the driver assembly, at TB30-7 & TB30-
15, if a problem occurs in the output
lines. NOTE: If an overtemperature fault
occurs, it must be manually reset on the
system controller after repairs are made.
The combined output of the hybrid
combiner at the “7/8” Jack J3 is
connected to J1 on the digital bandpass
filter. The filtered output of the bandpass
filter is connected to (A14) the low pass
filter assembly. The output of the filter is
either cabled directly to the (A11) output
coupler or first to an optional 1 or 2
section trap filter and then to the output
coupler. The (A11) coupler assembly
supplies a forward and a reflected power
samples to the (A4) Dual Peak Detector
Board. The Dual Peak Detector Board
supplies reflected and forward output
power samples to the exciter/driver for
metering purposes. The reflected sample
connects to TB31-13 and the forward
sample at TB31-14. The RF output for
the transmitter is at J2 the 7/8” EIA
connector on the (A11) coupler
assembly.
2.1.2.3 1.5 kW Digital Output System
Configuration
In a 1.5 kW system, the outputs of A3,
A6 and A13 power amplifier chassis
assemblies, at the “N” connectors J205,
are cabled to (A7) the hybrid combiner
for the system mounting facing the rear

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-5
of the cabinet. A 500 Watt reject load
(A18), mounted on the roof of the
cabinet, connects to J4 on the hybrid
combiner to dissipate reject power.
Another 500 Watt reject load (A9), also
mounted on the roof, connects to J5 on
the hybrid combiner to dissipate reject
power. Thermal switches (A9-A1 & A18-
A1) are mounted to the reject loads and
supply overtemperature faults, at 175º F.,
to the driver assembly at TB30-7 & 15, if
a problem occurs in the output lines.
NOTE: If an overtemperature fault occurs,
it must be manually reset on the system
controller after repairs are made. The
combined output of the hybrid combiner is
cabled to the externally mounted
assemblies, which consist of (A15) the
digital bandpass filter, (A14) the low pass
filter, (A10) the optional output trap filter
and (A11) the output coupler. The output
coupler assembly supplies a forward and a
reflected sample to the (A44) Dual Peak
Detector Board. The Dual Peak Detector
Board supplies samples to the
exciter/driver for metering purposes. The
reflected sample connects to TB31-13 and
the forward sample to TB31-14. The RF
output for the transmitter is at J2 the 3-
1/8” EIA connector on the (A11) output
coupler assembly.
2.1.2.4 2kW Digital Output System
Configuration
In a 2 kW digital system, the outputs of
the four power amplifier chassis
assemblies must be combined. This is
accomplished by combining two power
amplifier chassis assemblies, creating two
outputs then combing these into one
output. In the (A1) cabinet assembly, the
outputs of the (A1-A3 and A1-A6) power
amplifiers at the “7/16” connectors J205,
are cabled to the (A1-A7) hybrid
combiner, mounted to the input jack of
the (A1-A8) bandpass filter. A 1 kW
reject load (A1-A9), that dissipates reject
power, is mounted on a shelf inside the
(A1) cabinet and is connected to (J4) on
the hybrid combiner. A thermal switch
(A1-A9-A1) is mounted to the reject load
and supplies an overtemperature fault, at
175º F., to the driver assembly at TB30-7
& 15, if a problem occurs in the output
lines for the (A1) amplifier cabinet. The
combined output at (A1-A7-J3) of the
hybrid combiner connects to the (A1-A8)
bandpass filter for filtering before it is
connected either directly to the “7/8”
Jack J1 on (A3) the 2 way combiner
assembly mounted on the roof of the
cabinets, or through the optional (A1-
A12) trap filter and then to the 2 way
combiner.
In the (A2) cabinet, the outputs of the
(A2-A3 and A2-A6) power amplifiers at
the “7/16” connectors J205, are cabled to
(A2-A7) hybrid combiner. A 1 kW reject
load (A2-A9) connects to (J4) on the
hybrid combiner to dissipate reject
power. A thermal switch (A2-A9-A1) is
mounted to the reject load and supplies
an overtemperature fault, at 175º F., to
the driver assembly at TB30-7 & 15, if a
problem occurs in the output lines for the
(A2) amplifier cabinet. The combined
output at (A2-A7-J3) of the hybrid
combiner connects to the (A2-A8)
bandpass filter for filtering before it is
connected either directly to the “7/8”
Jack J2 on (A3) the 2 way combiner
assembly mounted on the roof of the
cabinets, or through the optional (A2-
A12) trap filter and then to the 2 way
combiner. The combined output of the
(A3) 2 way combiner at the 1-5/8”
connector (A3-J3) is connected to the
input of the (A4) output coupler. The
output coupler assembly supplies a
forward power sample at (A4-J3) and a
reflected sample at (A4-J6) to the (A44)
Dual Peak Detector Board. The Dual
Peak Detector Board supplies a reflected
power sample to TB31-13 and a forward
power sample to TB31-14 on the
exciter/driver for metering purposes.
The RF output for the transmitter is at J2
the 1-5/8” connector on the (A4) output
coupler assembly.
2.1.2.5 2.5kW Digital Output System
Configuration
In a 2.5 kW digital system, the outputs of
the five power amplifier chassis
assemblies must be combined. This is

LX Series Digital Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly Maintenance & Remote Control Connections
Volume 2, Rev. 1 2-6
accomplished by combining three power
amplifier chassis assemblies, creating one
combined output, and combining the
other two power amplifier chassis
assemblies, creating another combined
output. The two combined outputs are
then combined into one output. In the
(A2) cabinet assembly, the outputs of the
(A2-A3, A2-A6, and A2-A13) power
amplifiers at the “7/16” connectors J205,
are cabled to the J1, J2 & J3 input jacks of
(A2-A7) a 3 way hybrid combiner. A 500
Watt reject load (A2-A5), that dissipates
reject power, is mounted near the top of
the (A2) cabinet facing the rear and is
connected to (J5) on the hybrid combiner.
A thermal switch (A2-A5-A1) is mounted
to the reject load and supplies an
overtemperature fault, at 175º F., to the
driver assembly at TB30-7 & 15, if a
problem occurs in the combining process
for the (A2) amplifier cabinet. Another
500 Watt reject load (A2-A8), that
dissipates reject power, is mounted next
to the other load also facing the rear of
the (A2) cabinet and is connected to (J4)
on the hybrid combiner. A thermal switch
(A2-A9-A1) is mounted to the reject load
and supplies an overtemperature fault, at
175º F., to the driver assembly at TB30-7
& 15, if a problem occurs in the combining
process in the (A2) amplifier cabinet. This
fault is in parallel with the other fault line.
The combined output of the A2 cabinet at
(A2-A7-J6) of the hybrid combiner
connects to one of the input jacks (J1) on
(A3) the 2 way combiner mounted on the
roof of the cabinets.
In the (A1) cabinet, the outputs of the
(A1-A3 and A1-A6) power amplifiers at
the “7/16” connectors J205, are cabled to
(A1-A7) hybrid combiner. A 500 Watt
reject load (A1-A18) connects to (J4) on
the hybrid combiner to dissipate reject
power. A thermal switch (A1-A18-A1) is
mounted to the reject load and supplies
an overtemperature fault, at 175º F., to
the driver assembly at TB30-7 & 15, if a
problem occurs during the combining in
the (A1) amplifier cabinet. The combined
output of the A1 cabinet at (A1-A7-J3) of
the hybrid combiner connects to the other
input jack (J2) on (A3) the 2 way
combiner mounted on the roof of the
cabinets. J4 on the combiner connects to
a 1.5 kW reject load (A1-A9), which
dissipates reject power, which is
mounted inside the cabinet facing the
rear of the (A1) cabinet. A thermal
switch (A1-A9-A1) is mounted to the
reject load and supplies an
overtemperature fault, at 175º F., to the
driver assembly at TB30-7 & 15, if a
problem occurs in the combing of the
(A1) and the (A2) amplifier cabinets.
This fault is in parallel with the other
overtemperature fault lines.
The combined output of the (A3)
combiner connects to the (A8) digital
bandpass filter for filtering before it is
connected through the (A12) low pass
trap filter, for additional filtering, to the
input of the (A11) output coupler. The
output coupler assembly supplies a
forward power sample at (A1-A44-J1)
and a reflected sample at (A1-A44-J2) to
the (A44) Dual Peak Detector Board. The
Dual Peak Detector Board supplies a
reflected power sample to TB31-13 and a
forward power sample to TB31-14 on the
exciter/driver for metering purposes.
The RF output for the transmitter is at J2
the 3-1/8” connector on the A11 output
coupler assembly.
2.1.2.6 3kW Digital Output System
Configuration
In a 3 kW system, the outputs of the six
power amplifier chassis assemblies must
be combined. This is accomplished by
combining three power amplifier chassis
assemblies, creating one combined
output, and combining the other three
power amplifier chassis assemblies,
creating another combined output. The
two combined outputs are then combined
into one output. In the (A1) cabinet
assembly, the outputs of the (A1-A3, A1-
A6, and A1-A13) power amplifiers at the
“7/16” connectors J205, are cabled to the
J1, J2 & J3 input jacks of (A1-A7) a 3
way hybrid combiner. A 500 Watt reject
load (A1-A9), that dissipates reject
power, is mounted on the roof of the
(A1) cabinet and is connected to (J5) on