UBS Axcera 425A 500-watt solid state television transmitter User Manual Table of Contents
UBS-Axcera 500-watt solid state television transmitter Table of Contents
Contents
Table of Contents
500-Watt VHF Transmitter Table of Contents
425A, Rev. 0 i
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Manual Overview ..................................................................................1-1
1.2 Assembly Designation Procedure ............................................................1-1
1.3 Safety .................................................................................................1-1
1.4 Maintenance.........................................................................................1-2
1.5 Material Return Procedure......................................................................1-2
1.6 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 Site Considerations ...............................................................................4-1
4.2 Unpacking the Cabinets and Trays ..........................................................4-4
4.3 Installing the Cabinets and Trays............................................................4-5
4.4 Setup and Operation .............................................................................4-6
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 High-Band VHF Exciter Tray with Baseband Video and Audio Inputs............5-1
5.2 VHF Exciter Tray with 4.5-MHz Composite Input Kit..................................5-1
5.3 VHF Exciter Tray with Either Baseband or 4.5-MHz Composite Input...........5-2
5.4 IF Phase Corrector Adjustment...............................................................5-3
5.5 Linearity Corrector Adjustment...............................................................5-3
5.6 Phase and Gain Adjustment of the VHF Amplifier Trays .............................5-4
500-Watt VHF Transmitter Table of Contents
425A, Rev. 0 ii
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
500-Watt VHF Transmitter Table of Contents
425A, Rev. 0 iii
LIST OF FIGURES
4-1 1 kW Minimum Ventilation Configuration ..........................................4-4
4-2 Chassis Trak Cabinet Slides.............................................................4-5
5-1 Waveform...................................................................................5-12
500-Watt VHF Transmitter Table of Contents
425A, Rev. 0 iv
LIST OF TABLES
2-1 425A Major Trays and Assemblies....................................................2-1
2-2 VHF Exciter Tray Meters .................................................................2-3
2-3 VHF Exciter Tray Switches ..............................................................2-4
2-4 VHF Exciter Tray Fault Indicators.....................................................2-4
2-5 VHF Exciter Tray Samples...............................................................2-5
2-6 600-Watt Amplifier Tray Switches....................................................2-6
2-7 600-Watt Amplifier Tray Fault Indicators ..........................................2-7
2-8 600-Watt Amplifier Tray Control Adjustments ...................................2-7
2-9 600-Watt Amplifier Tray Sample......................................................2-7
2-10 VHF Exciter Remote Interface Connections
With the A/V Input and Remote Interface Assembly......................2-8
2-11 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 Bandpass Filter Typical Values.........................................................5-6
5-2 ALC Board LEDs...........................................................................5-14