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

Table of Contents

500-Watt VHF Transmitter Table of Contents425A, Rev. 0 iTABLE OF CONTENTSCHAPTER 1 INTRODUCTION1.1 Manual Overview ..................................................................................1-11.2 Assembly Designation Procedure ............................................................1-11.3 Safety .................................................................................................1-11.4 Maintenance.........................................................................................1-21.5 Material Return Procedure......................................................................1-21.6 Warranty for Broadcast Products – Limited One-Year Warranty ..................1-3CHAPTER 2 SYSTEM DESCRIPTION2.1 System Overview..................................................................................2-12.2 Control and Status................................................................................2-22.2.1 VHF Exciter Tray..........................................................................2-32.2.2 600-Watt Amplifier Tray ...............................................................2-62.3 Input and Remote Connections...............................................................2-72.4 AC Input............................................................................................2-10CHAPTER 3 CIRCUIT DESCRIPTIONS3.1 High-Band VHF Exciter ...............................................................................3-13.1.1 Aural IF Synthesizer Board, 4.5 MHz...................................................3-13.1.2 Sync Tip Clamp/Modulator Board........................................................3-23.1.3 Delay Equalizer Board .......................................................................3-53.1.4 IF Carrier Oven Oscillator Board .........................................................3-63.1.5 ALC Board, NTSC..............................................................................3-73.1.6 IF Phase Corrector Board.................................................................3-133.1.7 VHF Mixer/Amplifier Enclosure Assembly ...........................................3-153.1.8 Transmitter Control Board................................................................3-173.1.9 Visual/Aural Metering Board.............................................................3-223.1.10 Channel Oscillator Assembly, Dual Oven..........................................3-233.1.11 EEPROM FSK Identifier Board .........................................................3-233.1.12 IF Attenuator Board.......................................................................3-243.2 600-Watt High-Band VHF Amplifier Trays....................................................3-243.3 Bandpass Filter Assembly .........................................................................3-28CHAPTER 4 INSTALLATION AND SETUP PROCEDURES4.1 Site Considerations ...............................................................................4-14.2 Unpacking the Cabinets and Trays ..........................................................4-44.3 Installing the Cabinets and Trays............................................................4-54.4 Setup and Operation .............................................................................4-6CHAPTER 5 DETAILED ALIGNMENT PROCEDURES5.1 High-Band VHF Exciter Tray with Baseband Video and Audio Inputs............5-15.2 VHF Exciter Tray with 4.5-MHz Composite Input Kit..................................5-15.3 VHF Exciter Tray with Either Baseband or 4.5-MHz Composite Input...........5-25.4 IF Phase Corrector Adjustment...............................................................5-35.5 Linearity Corrector Adjustment...............................................................5-35.6 Phase and Gain Adjustment of the VHF Amplifier Trays .............................5-4
500-Watt VHF Transmitter Table of Contents425A, Rev. 0 iiTABLE OF CONTENTS (continued)5.7 Calibration of the Forward Output Power Level of the Transmitter...............5-55.8 Calibration of the Reflected Output Level of the Transmitter.......................5-55.9 2-Way Combiner Assembly ....................................................................5-65.10 Bandpass Filter Assemblies ..................................................................5-65.11 600-Watt High-Band VHF Amplifier Tray ................................................5-65.11.1 AGC Control Board.....................................................................5-65.11.2 Phase Shifter Board....................................................................5-75.11.3 VHF Filter/Amplifier Board...........................................................5-75.11.4 High-Band VHF Amplifier Board ...................................................5-75.11.5 Overdrive Protection Board .........................................................5-75.11.6 VHF High-Band Amplifier Board ...................................................5-75.11.7 4-Way Splitter Board..................................................................5-85.11.8 High-Band Amplifier Board..........................................................5-85.11.9 4-Way Combiner Board...............................................................5-85.11.10 Calibration of the Visual Plus Aural OutputPower and VSWR Cutback.........................................................5-85.12 Board Level Alignment Procedures ........................................................5-95.12.1 (Optional) 4.5-MHz Composite Input Kit .......................................5-95.12.2 Delay Equalizer Board...............................................................5-105.12.3 Composite 4.5-MHz Filter Board.................................................5-105.12.4 (Optional) 4.5-MHz Bandpass Filter Board...................................5-105.12.5 IF Carrier Oven Oscillator Board.................................................5-115.12.6 Sync Tip Clamp/Modulator Board ...............................................5-115.12.7 Aural IF Synthesizer Board, 4.5 MHz ..........................................5-135.12.8 ALC Board (Part 1 of 2).............................................................5-145.12.9 IF Phase Corrector Board..........................................................5-155.12.10 ALC Board, NTSC (Part 2 of 2).................................................5-155.12.11 Channel Oscillator Board, Dual Oven ........................................5-165.12.12 x4 Multiplier Board .................................................................5-165.12.13 VHF Filter/Mixer Board............................................................5-165.12.14 High-Band VHF Filter/Amplifier Board .......................................5-17APPENDICESAPPENDIX A SYSTEM SPECIFICATIONSAPPENDIX B SAMPLE LOG REPORT SHEETAPPENDIX C ASSEMBLY DRAWINGSAPPENDIX D SUBASSEMBLY DRAWINGS
500-Watt VHF Transmitter Table of Contents425A, Rev. 0 iiiLIST OF FIGURES4-1 1 kW Minimum Ventilation Configuration ..........................................4-44-2 Chassis Trak Cabinet Slides.............................................................4-55-1 Waveform...................................................................................5-12
500-Watt VHF Transmitter Table of Contents425A, Rev. 0 ivLIST OF TABLES2-1 425A Major Trays and Assemblies....................................................2-12-2 VHF Exciter Tray Meters .................................................................2-32-3 VHF Exciter Tray Switches ..............................................................2-42-4 VHF Exciter Tray Fault Indicators.....................................................2-42-5 VHF Exciter Tray Samples...............................................................2-52-6 600-Watt Amplifier Tray Switches....................................................2-62-7 600-Watt Amplifier Tray Fault Indicators ..........................................2-72-8 600-Watt Amplifier Tray Control Adjustments ...................................2-72-9 600-Watt Amplifier Tray Sample......................................................2-72-10 VHF Exciter Remote Interface Connections With the A/V Input and Remote Interface Assembly......................2-82-11 VHF Amplifier Tray Remote Interface ConnectionsWith the A/V Input and Remote Interface Assembly....................2-103-1 600-Watt Amplifier Tray Boards and Assemblies..............................3-255-1 Bandpass Filter Typical Values.........................................................5-65-2 ALC Board LEDs...........................................................................5-14

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