UBS Axcera LU6000AL Compiled External Amplifier Manual

INSTRUCTION MANUAL
Innovator
LX Series
Analog Power Amplifier
Assembly
103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA
(724) 873-8100 FAX (724) 873-8105
www.axcera.com info@axcera.com
LX Series Power Amplifier Assembly Table of Contents
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
2.1.1.1 250 Watt Power Amplifier Chassis Configuration................... 2-3
2.1.1.2 500 Watt Power Amplifier Chassis Configuration................... 2-3
2.1.1.3 1 kW Power Amplifier Chassis Configuration ........................ 2-3
2.1.2 System Configurations............................................................. 2-3
2.1.2.1 250W, 500W or 1kW System Configurations........................ 2-4
2.1.2.2 2 kW System Configuration.............................................. 2-4
2.1.2.3 3 kW System Configuration.............................................. 2-5
2.1.2.4 4 kW System Configuration.............................................. 2-5
2.1.2.5 5 kW System Configuration.............................................. 2-6
2.1.2.6 6 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 System Operation ..........................................................................2-10
2.2.1 Principles of Operation ............................................................2-10
2.3 Maintenance.................................................................................2-12
2.4 Customer Remote Connections ...................................................2-12
CHAPTER 3 SITE CONSIDERATIONS, INSTALLATION AND SETUP PROCEDURE S
3.1 Site Considerations.......................................................................... 3-1
3.2 Unpacking the Chassis w/Modules, bandpass and trap filters .................... 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 ....................................................................... 3-9
3.5.2.1 Receiver Module LEDs on Front Panel ................................. 3-9
3.5.2.2 Modulator Module LEDs on Front Panel............................... 3-9
3.5.2.3 IF Processor Module LEDs on Front Panel ...........................3-10
3.5.2.4 Upconverter Module LEDs on Front Panel...........................3-10
3.5.2.5 Controller Module LEDs on Front Panel ..............................3-10
3.5.2.6 Power or Driver Amplifier Module LEDs on Front Panel ..........3-10
3.5.3 Front Panel Screens for the (Optional) Exciter Switcher Tray ..........3-10
3.5.4 Front Panel Screens for the Exciter/Amplifier Chassis Assembly ......3-13
3.5.5 Operation Pro cedure ..............................................................3-22
LX Series, Rev. 1 March 2, 2005 i
LX Series Power Amplifier Assembly Table of Contents
TABLE OF CONTENTS - (Continued)
SECTION PAGE
CHAPTER 4 CIRCUIT DESCRIPTIONS
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
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 Module Replacement ........................................................................ 5-1
5.1.1 Initial Test Setup .................................................................... 5-1
5.2 Innovator LX Series Exciter/Driver Chassis Assembly.............................. 5-1
5.2.1 (Optional) Receiver Module Assembly ......................................... 5-2
5.2.2 Modulator Module Assembly ...................................................... 5-2
5.2.3 IF Processor Module Assembly .................................................. 5-3
5.2.4 VHF/UHF Upconverter Module Assembly ...................................... 5-3
5.2.5 Setting up the Drive Level of the Transmitter ............................... 5-4
5.2.6 Changing the Channel on the Transmitter.................................... 5-4
5.2.7 Frequency Response Delay Equalization Adjustment ...................... 5-4
5.2.8 Linearity Correction Adjustment ................................................ 5-5
5.3 Bandpass Filter Assembly ................................................................. 5-6
5.4 (Optional) One or Two Section Trap Filter Assembly ............................... 5-7
5.4.1 Fine Tuning ........................................................................... 5-8
5.4.2 Major Tuning ......................................................................... 5-8
5.5 Calibration of Transmitter Forward Output Power Level........................... 5-9
5.6 Calibration of Transmitter Reflected Output Power Level ........................5-10
APPENDICES
APPENDIX A INNOVATOR LX SERIES SPECIFICATIONS APPENDIX B DRAWINGS AND PARTS LISTS APPENDIX C TRANSMITTER LOG SHEET
LX Series, Rev. 1 March 2, 2005 ii
LX Series Power Amplifier Assembly Table of Contents
LIST OF FIGURES
FIGURE PAGE
1-1 Brady Marker Identification Drawing............................................. 1-1
2-1 1kW Power Amplifier Assembly Racking Plan .................................. 2-3
3-1 1 kW Minimum Ventilation Configuration ....................................... 3-4
3-2 Front and Rear View Exciter/Driver .............................................. 3-5
3-3 Front and Rear View 76” Cabinet Typical 4kW Configuration.............. 3-6
3-4 AC Input Box Assembly ............................................................. 3-6
3-5 Rear View of LX Series Transmitter/Translator................................ 3-8
4-1 250 Watt UHF Amplifier Module ................................................... 4-2
5-1 Typical Red Field Spectrum......................................................... 5-5
5-2 Bandpass Filter........................................................................ 5-7
5-3 One Section Trap Filter.............................................................. 5-8
LX Series, Rev. 1 iii
LX Series Power Amplifier Assembly Table of Contents
LIST OF TABLES
TABLE PAGE
2-1 Typical LX Series Analog System Drawings and Parts Lists................ 2-3
2-2 Typical LX Series Dig ital System Drawings and Parts Lists................. 2-4
2-3 LX Series Power Amplifier Chassis Assemblies ................................ 2-8
2-4 Power Amplifier Status Indicators ................................................ 2-9
2-5 Power Amplifier Control Adjustments............................................ 2-9
2-6 Power Amplifier Sample ............................................................. 2-9
2-7 LX Series Customer Remote Connections...............................2-13
3-1 LX Series Transmitters AC Input and Current Requirements.............. 3-1
3-2 LX Series Transmitters AC Input and Current Requirements.............. 3-6
3-3 Rear Chassis Connections for LX Series Transmitter.........................3-8
(Optional) Exciter Switcher Menu Screens....................................................3-11
3-4 Exciter Switcher Menu 01 Splash Screen #1 .................................3-11
3-5 Menu 02 Splash Screen #2........................................................3-11
3-6 Menu 03 Exciter Switcher Control Screen, Automatic Operation.......3-11
3-7 Menu 04 Exciter Switcher Control Screen, Manual Operation...........3-11
3-8 Menu 05 Exciter Switcher Control Screen, Amps On Line................3-11
3-9 Menu 06 Exciter Switcher Control Screen, Cancel Auto Back up.......3-12
3-10 Menu 07 Exciter Switcher Control Screen, B Back up to A...............3-12
3-11 Menu 08 Exciter Switcher Control Screen, back up Changeover.......3-12
3-12 Menu 09 Exciter Switcher Control Screen, Ext Amp Status..............3-12
3-13 Menu 10 Exciter Switcher Control Screen, Ext Amp Status..............3-12
LX System Controller Menu Screens .............................................................3-13
3-14 Menu 01 Splash Screen #1........................................................3-13
3-15 Menu 02 Splash Screen #2........................................................3-13
3-16 Menu 10 Main Screen ..............................................................3-13
3-17 Menu 11 Error List Access Screen...............................................3-14
3-18 Menu 12 Transmitter Device Data Access Screen ..........................3-14
3-19 Menu 13 Transmitter Configuration Access Screen ........................3-14
3-20 Menu 20 Error List Display Screen ..............................................3-14
3-21 Menu 30 Transmitter Device Details Screen .................................3-15
3-22 Menu 30-1 System Details Screens ............................................3-15
3-23 Transmitter Device Parameters Detail Screens .............................3-15
3-24 Menu 40 Authorized Personnel Screen ........................................3-16
3-25 Menu 40-1 Transmitter Set Up: Power Raise/Lower Screen .............3-17
3-26 Menu 40-2 Transmitter Set Up: Model Select Screen .....................3-17
3-27 Menu 40-3 Transmitter Set Up: Receiver Channel Configuration......3-18
3-28 Menu 40-4 Transmitter Set Up: Upconverter Channel Select Screen .3-18
3-29 Menu 40-5 Transmitter Set Up: Serial Address Screen...................3-18
3-30 Menu 40-6 Transmitter Set Up: Station ID Screen..........................3-18
3-31 Menu 40-7 Transmitter Set Up: System Visual Power Cal. Screen......3-19
3-32 Menu 40-8 Transmitter Set Up: System Aural Power Cal. Screen.......3-19
3-33 Menu 40-9 Transmitter Set Up: System Rfltd. Power Cal. Screen ......3-19
3-34 Menu 40-10 Transmitter Set Up: Modulated Output Cal. Screen ........3-19
3-35 Menu 40-11 Transmitter Set Up: Aural Deviation Screen .................3-20
3-36 Menu 40-12 Transmitter Set Up: Fwrd Pwr Fault Threshold Screen....3-20
3-37 Menu 40-13 Transmitter Set Up: Refl Power Fault Threshold Screen ..3-20
3-38 Menu 40-14 Transmitter Set Up: DLC Control Screen......................3-20
3-39 Menu 40-15 Transmitter Set Up: Auto Standby Control Screen.........3-21
LX Series, Rev. 1 iv
LX Series Power Amplifier Assembly Table of Contents
LIST OF TABLES
TABLE PAGE
3-40 Menu 40-16 Transmitter Set Up: Receiver ALC Fault Set Up Screen...3-21
3-41 Menu 40-17 Transmitter Set Up: Inner Loop Gain Control Screen ......3-21
3-42 Menu 40-18 Transmitter Set Up: Optional System Control Screen .....3-21
3-43 Menu 40-19 Transmitter Set Up: Remote Command Control Screen...3-22
5-1 Typical Bandpass Values ............................................................ 5-6
5-2 Results of Tuning the Output Trap Filter........................................ 5-9
LX Series, Rev. 1 v
LX Series Power Amplifier Assembly Chapter 1, Introduction
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. It is important that you read all of the instructio ns, 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. Chapter 5, Detailed Alignment Procedures, provides information on adjusting the power amplifier and the system for optimal operation. Appendix
A contains system specifications. Appendix B contains assembly and
subassembly drawings and parts lists. Appendix C contains a transmitter log sheet.
1.2 Assembly Designators
Axcera has assigned assembly numbers, such as Ax (x=1,2,3…), to all assemblies, trays, and boards that are referenced in the text of this manual and shown on the block diagrams and interconnect drawings provided in the appendices. These supporting documents are arranged in increasing numerical order in the appendices. Section titles in the text for assembly or tray 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, Rev. 1 1-1
LX Series Power Amplifier Assembly Chapter 1, Introduction
1.3 Safety
The transmitters and associated power amplifier assemblies manufactured by Axcera are designed to be easy to use and repair while providing protection from electrical and mechanical hazards. Listed throughout the manual are notes, cautions, and warnings concerning possible safety hazards that may be encountered while operating or servicing the transmitter. Please review these warnings and familiarize yourself with the operation and servicing procedures before working on the assembly.
Read All Instructions – All of the operating and safety instructions should be read and understood before operating this equipment.
Retain Manuals – The manuals for the power amplifier assembly and the transmitter should be retained at the transmitter site for future reference. We provide 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 Instructions – All of the operating and use instructions for the amplifier assembly 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 cabinets and modules front panels are provided for ventilation. To ensure the reliable operation of the amplifier assembly, 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 (724) 873-8105.
Before calling Axcera, please be prepared to supply the Axcera technicia n 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
LX Series, Rev. 1 1-2
LX Series Power Amplifier Assembly Chapter 1, Introduction
Return Material Authorization Number (RMA#).
An RMA# can be obtained from any Axcera Field Service Engineer by contacting the Axcera Field Service Department at (724) 873-8100 or by fax at (724) 873-8105. 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 exchange 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:
For more information concerning this procedure, call the Axcera Field Service Department.
Axcera can also be contacted through e­mail at info@axcera.com 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, or bulbs.
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, Rev. 1 1-3
LX Series Power Amplifier Assembly Chapter 1, Introduction
F WARNING!!!
× HIGH VOLTAGE Ø
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, Rev. 1 1-4
LX Series Power Amplifier Assembly Chapter 1, Introduction
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.
SKIN REDDENED: 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. Consult a physician.
SKIN BLISTERED OR FLESH CHARRED: Apply ice cold water to burned area to prevent burn from going deeper into skin tissue.
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
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, Rev. 1 1-5
LX Series Power Amplifier Assembly Chapter 1, Introduction
dBm, dBw, dBmV, dBµV, & VOLTAGE
EXPRESSED IN WATTS
50 Ohm System
WATTS PREFIX dBm dBw dBm
V 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
dBµV VOLTAGE
TEMPERATURE CONVERSION
° F = 32 + [(9/5) °C]
° C = [(5/9) (°F - 32)]
LX Series, Rev. 1 1-6
LX Series Power Amplifier Assembly Chapter 1, Introduction
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 - 18 GHz K 18 - 27 GHz Ka 27 - 40 GHz V 40 - 75 GHz W 75 - 110 GHz
LX Series, Rev. 1 1-7
LX Series Power Amplifier Assembly Chapter 1, Introduction
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 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
LX Series, Rev. 1 1-8
LX Series Power Amplifier Assembly Chapter 1, Introduction
N
dB
RETURN LOSS VS. VSWR
0
-10
-20
R E T U R
L O S S
-30
-40
-50
-60
-70
1.001 1.01 1.1 2.0
VSWR
LX Series, Rev. 1 1-9
LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description, Maintenance & Remote Control Connections
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 250 Watts peak of sync output. There is also needed one external Power Supply Module Assembly for every two 250 Watt PA modules, which also slide into the Power Amplifier Chassis Assembly, under the PA Modules. Four PA modules and two Power Supply modules are the maximum number of modules in one Power Amplifier Chassis Assembly producing 1 kW analog output power . Two Power Amplifier Chassis Assemblies are required for 2 kW analog output power, three Power Amplifier Chassis Assemblies for 3 kW analog, four Power Amplifier Chassis Assemblies for 4 kW analog, five Power Amplifier Chassis Assemblies for 5 kW analog, and six Power Amplifier Chassis Assemblies are required for 6 kW analog output power.
In a 250W 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 500W or 1 kW 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 2 kW 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 3 kW 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 4 kW 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 5 kW 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-A6) and the (A1-A3) power amplifier chassis assemblies at J200. The RF outputs at J2 and J4 of the (A1-A5-A2) splitter are 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 (A1-A6), (A1-A3)
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and (A1-A13) power amplifier chassis assemblies at J200. The other output of the (A2-A5) splitter at J5 is terminated.
In a 6 kW 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-A5­A1) 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 (A1­A5-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 inf ormation for the system is fed through the system serial cable. In a 250W, 500W or 1kW system, the system serial cable connects from J34 on the exciter/driver assembly to J232 on the (A3) Power Amplifier Assembly.
In a 2 kW 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 3 kW 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 4 kW 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 (A1­A6) to J233 on the (A2-A3) power amplifier and then from J233 on the (A2­A3) power amplifier to J232 on the (A2­A6) power amplifier.
In a 5 kW 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 (A1­A6) 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 6 kW 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 (A1­A6) 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 J233 on (A2-A6) to J232 on (A2-A13) power amplifier.
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2.1.1 Power Amplifier Chassis Configurations
In the 250W 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.
2.1.1.1 250 Watt Power Amplifier Chassis Configuration
In a 250 Watt 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.
2.1.1.2 500 Watt Power Amplifier Chassis Configuration
In a 500 Watt power amplifier chassis assembly, Jacks J103 and J104, on the 4 way splitter assembly, are not used and are terminated with 50O. Also, the power amplifier modules #3 and #4 are not
2.1.2 System Configurations
Table 2-1: Typical LX Series Analog System Configuration Drawings and Parts Lists
ANALOG SYSTEM
CONFIGURATIONS
250W 1303515 1303383
500W
1 kW
INTERCONNECT RACKING PLAN PARTS LIST
(Transmitter) 1303564
(Translator) 1303563
(Transmitter) 1303564
(Translator) 1303563
used. Finally a 2 way combiner is used in place of the 4 way combiner.
2.1.1.3 1kW Power Amplifier Chassis Configuration
In a 1 kW 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. 1 kW Power Amplifier
Assembly Racking Plan
In a 1 kW 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.
(Transmitter) 1303865
(Translator) 1303862
1303383
1303383
(Transmitter) 1303864
(Translator) 1303269
(Transmitter) 1303604
(Translator) 1303272
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ANALOG SYSTEM
CONFIGURATIONS
2 kW 1303685 1303601 3 kW 1304066 1304075 (Transmitter) 1304068
4 kW 1304127 1304133 (Transmitter) 1304206 5 kW 1304278 1304277 (Transmitter) 1304276 6 kW 1304311 1304310 (Transmitter) 1304325
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.
2.1.2.1 250 Watt, 500 Watt or 1kW Output System Configurations
In a 250 Watt 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 500 Watt or 1 kW 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) Visual/Aural Metering Board. The Visual/Aural Metering Board supplies reflected, visual and aural output power samples to the exciter/ driver for metering purposes. The reflected sample connects to TB31-13, the visual sample at TB31-14 and the aural output power sample at TB31-15. The RF output for the transmitter is at J2 the 7/8” EIA connector on the (A11) coupler assembly.
2.1.2.2 2 kW Output System Configuration
In a 2 kW 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
INTERCONNECT RACKING PLAN PARTS LIST
(Transmitter) 1303866
(Translator) 1303828
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 & TB30­15, 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 bandpass filter. The filtered output of the bandpass filter is either cabled directly to the (A11) output coupler or first to the 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) Visual/Aural Metering Board. The Visual/Aural Metering Board supplies reflected, visual and aural output power samples to the exciter/driver for metering purposes. The reflected sample connects to TB31­13, the visual sample at TB31-14 and the aural output power sample at TB31-15. The RF output for the transmitter is at J2 the 7/8” EIA connector on the (A11) coupler assembly.
2.1.2.3 3kW Output System Configuration
In a 3 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 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
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mounted on the roof, connects to J5 on the hybrid combiner to dissipate reject power. Thermal switches (A9-A1 & A18­A1) 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 (A8) the bandpass filter, (A12) the output trap filter and (A11) the output coupler. The output coupler assembly supplies a forward and a reflected sample to the (A44) Visual/Aural Metering Board. The Visual/Aural Metering Board supplies samples to the exciter/driver for metering purposes. The reflected sample connects to TB31-13, the visual sample to TB31-14 and aural output power sample to TB31-
15. 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 4kW Output System Configuration
In a 4 kW 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 (A1­A12) 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 (A2­A12) 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) Visual/Aural Metering Board. The Visual/Aural Metering Board supplies a reflected power sample to TB31-13, a visual power sample to TB31-14 and aural power sample to TB31-15 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 5kW Output System Configuration
In a 5 kW system, the outputs of the five power amplifier chassis assemblies must be combined. This is accomplished by combining three power amplifier chassis assemblies, creating one combined
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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 (A1) cabinet assembly, the outputs of the (A1-A6 and A1-A3) power amplifiers at the “7/16” connectors J205, are cabled to the J1 and J2 input jacks of (A1-A7) a hybrid combiner. A 500 Watt reject load (A1­A18), that dissipates reject power, is mounted near the top of the (A1) cabinet and is connected to (J4) on the hybrid combiner. 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 in the output lines for the (A1) amplifier cabinet. A 1.5 kW reject load (A1-A9), that dissipates reject power, is mounted beside the 500W load in the (A1) cabinet and is connected to (A3-J4) a 2 way 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 transmitter. This fault is in parallel with the other fault line. The combined output of the A1 cabinet at (A1­A7-J3) of the hybrid combiner connects to (J2) one of the input jacks to (A3) the 2 way combiner mounted on the roof of the cabinets.
In the (A2) cabinet, the outputs of the (A2-A6, A2-A3 and A2-A13) power amplifiers at the “7/16” connectors J205, are cabled to (A2-A7) a hybrid combiner. A 500W reject load (A2-A9) connects to (J4) on the hybrid combiner to dissipate reject power. A thermal switch (A2-A9­A1) 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 of the power amplifiers in the (A2) amplifier cabinet. A 500W reject load (A2-A5) connects to (J5) on the hybrid combiner to dissipate reject power. 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 output lines for the (A2) amplifier cabinet. . These faults are in parallel with the other fault lines.
The combined output of the A2 cabinet at (A2-A7-J6) of the hybrid combiner connects to the other input jack (J1) 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), that 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 output lines for the (A2) amplifier cabinet. This fault is in parallel with the other overtemperature fault lines.
The combined output of the (A3) combiner at J3 connects to the (A8) bandpass filter for filtering before it is connected through the (A12) trap filter, for additional filtering, to the input of the (A11) output coupler. The outp ut coupler assembly supplies a forward power sample at (A1-A44-J1) and a reflected sample at (A1-A44-J2) to the (A44) Visual/Aural Metering Board, mounted in the (A1) cabinet. The Visual/Aural Metering Board supplies a reflected power sample to TB31-13, a visual power sample to TB31-14 and aural power sample to TB31-15 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 6kW Output System Configuration
In a 6 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
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into one output. In the (A1) cabinet assembly, the outputs of the (A1-A3, A1­A6, 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 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. Another 500 Watt reject load (A1-A18), that dissipates reject power, is mounted on the roof of the (A1) cabinet and is connected to (J4) on the hybrid combiner. A thermal switch (A1­A18-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. This fault is in parallel with the other fault line. The combined output of the A1 cabinet at (A1-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 (A2) cabinet, the outputs of the (A2-A3, A2-A6, and A3-A13) power amplifiers at the “7/16” connectors J205, are cabled to (A2-A7) hybrid combiner. A 500 Watt reject load (A2-A9) connects to (J4) on the hybrid combiner to dissipate reject power. A thermal switch (A2-A9­A1) 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. Another 500 Wat t reject load (A2-A18), that dissipates reject power, is mounted on the roof of the (A2) cabinet and is connected to (J4) on the hybrid combiner. A thermal switch (A2-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 in the output lines for the (A2) amplifier cabinet.
The combined output of the A2 cabinet at (A2-A7-J6) 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 (A5), that dissipates reject power, which is mounted inside the cabinet facing the rear of the (A2) cabinet. A thermal switch (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 output lines for the (A2) amplifier cabinet. This fault is in parallel with the other overtemperature fault lines. The combined output of the (A3) combiner connects to the (A8) bandpass filter for filtering before it is connected through the (A12) trap filter, for additional filtering, to the input of the (A11) output coupler. The output coupler assembly supplies a forward power sample at (A1­A44-J1) and a reflected sample at (A1­A44-J2) to the (A44) Visual/Aural Metering Board. The Visual/Aural Metering Board supplies a reflected power sample to TB31-13, a visual power sample to TB31-14 and aural power sample to TB31-15 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.
NOTE: If an overtemperature fault occurs in any system configuration, it must be manually reset on the system controller after re pairs are made.
The LX Series power amplifier assembly is made up of the modules and assemblies listed in Table 2-3.
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ASSEMBLY
DESIGNATOR
ASSEMBLY NAME PART NUMBER
125W/250W/500 Watt Chassis Assembly 1303958
Table 2-3: Typical LX Series Power Amplifier Chassis Assemblies
Or 500W Upgradeable & 1 kW Chassis Assembly
1303953
A3 & (Opt A6 & A13) Power Amplifier Assembly, 250 Watt 1302868
Power Supply Assembly 1302863
Opt A5 2 or 4 Way Splitter Assembly
1303567 (2 Way) 1303347 (4 Way)
A11 Coupler Assembly 450029
A4 or A44 Visual/Aural Metering Board 1265-1309
2.1.3 Power Amplifier Module Assembly, 250 Watt (1302868; Appendix B)
The Transmitter/Exciter Driver Power Amplifier module and any External Power Amplifier modules contain the same control and monitoring board. This board monitors RF output power, RF reflected power, the current draw of amplifier sections, the supply voltage, and the temperature of the PA heat sink. The RF power detector circuit outputs
The 250 Watt Power Amplifier Module Assembly is made up of (A6) an Amplifier Control Board (1303682, 1301962 or
1303702), (A1) a UHF Phase/Gain Board (1303213), (A2) a 150 Watt Driver Pallet Assembly (1303293), (A3 & A4) two RF Module Pallets, Philips (1300116), and (A5) a 2-Way Combiner Board (1303208).
The Power Amplifier Module contains Broadband LDMOS amplifiers that cover the entire UHF band with no tuning required. Each module amplifies the RF to a nominal 300W output power. The Power Amplifier assembly is used to amplify the RF output of the Transmitter/Exciter Driver. A cable, located on the rear chassis, connects the RF output from the Exciter/Driver at J25 to J200 the RF input to the PA Assembly. This module contains RF monitoring circuitry for both an analog and a digital system. Control and monitoring lines to the Power Amplifier module are routed through the floating blind-mate connector of the Control & Monitoring/Power Supply module.
vary with operating frequency. These circuits must be calibrated at their intended operating frequency. The following front panel potentiometers are used to set the Power Amplifier Calibrations in Analog Systems.
R201 Reflected Power Cal R202 Forward Power Cal R204 Meter Offset Zero
In analog systems, the Aural power of an Exciter Driver Power Amplifier and the Aural power of any external amplifier will not be reported by the system Control Monitoring module. Additionally the Visual power of these amplifiers, is reported as Forward Power just like in digital systems. In analog systems, aural and visual power will only be reported for the final system RF output.
If the Control Monitoring module is monitoring a 10-100 Watt Analog Transmitter, system power is measured in the Power Amplifier module. The wired connections are transferre d through the power supply connector to
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the backplane board on a five position header. All four positions of control board switch SW1 must be set on to route these lines as the system's RF power signals. In systems of output power greater than 100 Watts, system power is monitored by an external module that is connected to TB31 and control board SW1 switches must be set off.
The Forward Power of the Transmitter/Exciter Driver Power Amplifier module is routed to the Upconverter module as AGC #1. A system over-drive condition is detected when this value rises above 0.9 VDC. When an over-drive condition is detected, the Upconverter module reduces its RF output level. For values less than 0.9 VDC, the Upconverter uses this voltage for automatic gain.
Table 2-4. Power Amplifier Status Indicator
LED FUNCTION
ENABLED
(Green)
DC OK
(Green)
TEMP
(Green)
MOD OK
(Green)
When lit Green, it indicates that the PA is in the Operate Mode. If a Mute occurs, the PA will remain Enabled, until the input signal is returned. When lit Green, it indicates that the fuse protected DC inputs to the PA module are OK. When lit Green, it indicates that the temperature of the heatsink assembly in the module is below 78°C. When lit Green, it indicates that the PA Module is operating and has no faults. If the Module OK LED is Red and blinking a fault is present. 1 Blink indicates Amplifier Current Fault.
MOD OK
(Red)
2 Blinks indicate Temperature Fault. 3 Blinks indicate +32V Power Supply Over Voltage Fault. 4 Blinks indicate +32V Power Supply Under Voltage Fault. 5 Blinks indicate Reflected Power Fault. 6 Blinks indicate +12V or –12V Power Supply Fault.
Table 2-5. Power Amplifier Control Adjustments
POTENTIOMETERS DESCRIPTION
RFL CAL Adjusts the gain of the Reflected Power monitoring circuit
VISUAL CAL Adjusts the gain of the Visual / Forward Power monitoring circuit
METER ZERO Adjusts the offset of the Forward Power monitoring circuit
Table 2-6. Power Amplifier Sample
DISPLAY FUNCTION
FWD SAMPLE RF sample of the amplified signal being sent out the module on J25.
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2.1.4 Power Supply Module Assembly, LX Series (1302863; Appendix B)
The Power Supply Module Assembly is made up of (A1) a +32V/2000W Switching Power Supply and (A2) a ±12V/40W Switching Power Supply.
The power supply module provides the +32 VDC and the +12 VDC and –12 VDC to the power amplifier module assembly .
2.1.5 Front Panel Display Screens
NOTE: In systems with two exciters and an exciter switcher, first perform the following procedure with Exciter A as the On Air Exciter then select Exciter B as the On Air Exciter and repeat the procedure. Switcher system must be in Manual.
A 4 x 20 display located on the front of the Control & Monitoring/Power Supply Module is used in the LX Series transmitter for control of the operation and display of the operating parameters of the entire transmitter. Refer to Chapter 3 for detailed information on the LCD menu screens.
2.2 System Operation
When the transmitter is in operate, as set by the menu screen located on the Control & Monitoring Module in the exciter/driver assembly. The IF Processor will be enabled, the mute indicator on the front panel will be extinguished. The +32 VDC stage of the Power Supply in the Control & Monitoring Module is enabled, the operate indicator on the front panel is lit and the DC OK on the front panel should also be green. The enable and DC OK indicators on the PA Module will also be green.
When the transmitter is in standby. The IF Processor will be disabled, the mute indicator on the front panel will be red. The +32 VDC stage of the Power Supply in the Control & Monitoring Module is disabled, the operate indicator on the front panel will be extinguished and the DC OK on the front panel should remain green. The enable indicator on the PA Module is also extinguished.
If the transmitter does not switch to Operate when the operate menu is switched to Operate, check that all faults are cleared and that the remote control terminal block stand-by signal is not active.
The transmitter can be controlled by the presence of a modulated input signal. If the input signal to the transmitter is lost; the transmitter automatically cutbacks and the input fault indicator on the IF Processor module lights. When the video input signal returns, the transmitter automatically returns to full power and the input fault indicator is extinguished.
2.2.1 Principles of Operation
Operating Modes
This transmit ter is either operating or in standby mode. The sections below discuss the characteristics of each of these modes.
Operate Mode
Operate mode is the normal mode for the transmitter when it is providing RF power output. To provide RF power to the output, the transmitter will not be in mute. Mute is a special case of the operate mode where the +32 VDC section of the power supply is enabled but there is no RF output power from the transmitter. This condition is the result of a fault condition that causes the firmware to hold the IF Processor module in a mute state.
LX Series, Rev. 1 2-10
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