UBS Axcera 425A 500-watt solid state television transmitter User Manual Table of Contents

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Document ID	99868
Application ID	8Q73O8/VEwa2gsYbPPmrwg==
Document Description	Table of Contents
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Microsoft Word - pdf
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Date Submitted	2000-05-12 00:00:00
Date Available	2000-06-13 00:00:00
Creation Date	2000-05-12 10:58:14
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2000-05-12 10:58:16
Document Title	Table of Contents

500-Watt VHF Transmitter
Table of Contents
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1
1.2
1.3
1.4
1.5
1.6
Manual Overview ..................................................................................1-1
Assembly Designation Procedure ............................................................1-1
Safety .................................................................................................1-1
Maintenance.........................................................................................1-2
Material Return Procedure......................................................................1-2
Warranty for Broadcast Products – Limited One-Year Warranty ..................1-3
CHAPTER 2 SYSTEM DESCRIPTION
2.1 System Overview..................................................................................2-1
2.2 Control and Status ................................................................................2-2
2.2.1 VHF Exciter Tray ..........................................................................2-3
2.2.2 600-Watt Amplifier Tray ...............................................................2-6
2.3 Input and Remote Connections...............................................................2-7
2.4 AC Input ............................................................................................2-10
CHAPTER 3 CIRCUIT DESCRIPTIONS
3.1 High-Band VHF Exciter ...............................................................................3-1
3.1.1 Aural IF Synthesizer Board, 4.5 MHz ...................................................3-1
3.1.2 Sync Tip Clamp/Modulator Board........................................................3-2
3.1.3 Delay Equalizer Board .......................................................................3-5
3.1.4 IF Carrier Oven Oscillator Board .........................................................3-6
3.1.5 ALC Board, NTSC ..............................................................................3-7
3.1.6 IF Phase Corrector Board ................................................................. 3-13
3.1.7 VHF Mixer/Amplifier Enclosure Assembly ........................................... 3-15
3.1.8 Transmitter Control Board................................................................ 3-17
3.1.9 Visual/Aural Metering Board............................................................. 3-22
3.1.10 Channel Oscillator Assembly, Dual Oven .......................................... 3-23
3.1.11 EEPROM FSK Identifier Board ......................................................... 3-23
3.1.12 IF Attenuator Board....................................................................... 3-24
3.2 600-Watt High-Band VHF Amplifier Trays.................................................... 3-24
3.3 Bandpass Filter Assembly ......................................................................... 3-28
CHAPTER 4 INSTALLATION AND SETUP PROCEDURES
4.1
4.2
4.3
4.4
Site Considerations ...............................................................................4-1
Unpacking the Cabinets and Trays ..........................................................4-4
Installing the Cabinets and Trays............................................................4-5
Setup and Operation .............................................................................4-6
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1
5.2
5.3
5.4
5.5
5.6
High-Band VHF Exciter Tray with Baseband Video and Audio Inputs............5-1
VHF Exciter Tray with 4.5-MHz Composite Input Kit ..................................5-1
VHF Exciter Tray with Either Baseband or 4.5-MHz Composite Input ...........5-2
IF Phase Corrector Adjustment ...............................................................5-3
Linearity Corrector Adjustment ...............................................................5-3
Phase and Gain Adjustment of the VHF Amplifier Trays .............................5-4
425A, Rev. 0
500-Watt VHF Transmitter
Table of Contents
TABLE OF CONTENTS (continued)
5.7 Calibration of the Forward Output Power Level of the Transmitter...............5-5
5.8 Calibration of the Reflected Output Level of the Transmitter.......................5-5
5.9 2-Way Combiner Assembly ....................................................................5-6
5.10 Bandpass Filter Assemblies ..................................................................5-6
5.11 600-Watt High-Band VHF Amplifier Tray ................................................5-6
5.11.1 AGC Control Board .....................................................................5-6
5.11.2 Phase Shifter Board....................................................................5-7
5.11.3 VHF Filter/Amplifier Board...........................................................5-7
5.11.4 High-Band VHF Amplifier Board ...................................................5-7
5.11.5 Overdrive Protection Board .........................................................5-7
5.11.6 VHF High-Band Amplifier Board ...................................................5-7
5.11.7 4-Way Splitter Board ..................................................................5-8
5.11.8 High-Band Amplifier Board ..........................................................5-8
5.11.9 4-Way Combiner Board...............................................................5-8
5.11.10 Calibration of the Visual Plus Aural Output
Power and VSWR Cutback.........................................................5-8
5.12 Board Level Alignment Procedures ........................................................5-9
5.12.1 (Optional) 4.5-MHz Composite Input Kit .......................................5-9
5.12.2 Delay Equalizer Board...............................................................5-10
5.12.3 Composite 4.5-MHz Filter Board.................................................5-10
5.12.4 (Optional) 4.5-MHz Bandpass Filter Board...................................5-10
5.12.5 IF Carrier Oven Oscillator Board.................................................5-11
5.12.6 Sync Tip Clamp/Modulator Board ...............................................5-11
5.12.7 Aural IF Synthesizer Board, 4.5 MHz ..........................................5-13
5.12.8 ALC Board (Part 1 of 2).............................................................5-14
5.12.9 IF Phase Corrector Board ..........................................................5-15
5.12.10 ALC Board, NTSC (Part 2 of 2) .................................................5-15
5.12.11 Channel Oscillator Board, Dual Oven ........................................5-16
5.12.12 x4 Multiplier Board .................................................................5-16
5.12.13 VHF Filter/Mixer Board............................................................5-16
5.12.14 High-Band VHF Filter/Amplifier Board .......................................5-17
APPENDICES
APPENDIX A SYSTEM SPECIFICATIONS
APPENDIX B SAMPLE LOG REPORT SHEET
APPENDIX C ASSEMBLY DRAWINGS
APPENDIX D SUBASSEMBLY DRAWINGS
425A, Rev. 0
ii
500-Watt VHF Transmitter
Table of Contents
LIST OF FIGURES
4-1
4-2
1 kW Minimum Ventilation Configuration ..........................................4-4
Chassis Trak Cabinet Slides.............................................................4-5
5-1
Waveform...................................................................................5-12
425A, Rev. 0
iii
500-Watt VHF Transmitter
Table of Contents
LIST OF TABLES
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
425A Major Trays and Assemblies....................................................2-1
VHF Exciter Tray Meters .................................................................2-3
VHF Exciter Tray Switches ..............................................................2-4
VHF Exciter Tray Fault Indicators.....................................................2-4
VHF Exciter Tray Samples...............................................................2-5
600-Watt Amplifier Tray Switches....................................................2-6
600-Watt Amplifier Tray Fault Indicators ..........................................2-7
600-Watt Amplifier Tray Control Adjustments ...................................2-7
600-Watt Amplifier Tray Sample......................................................2-7
VHF Exciter Remote Interface Connections
With the A/V Input and Remote Interface Assembly ......................2-8
VHF Amplifier Tray Remote Interface Connections
With the A/V Input and Remote Interface Assembly ....................2-10
3-1
600-Watt Amplifier Tray Boards and Assemblies..............................3-25
5-1
5-2
Bandpass Filter Typical Values.........................................................5-6
ALC Board LEDs...........................................................................5-14
425A, Rev. 0
iv

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