UBS Axcera 325A 500-Watt VHF Low-band Television Transmitter User Manual Table of Contents

UBS-Axcera 500-Watt VHF Low-band Television Transmitter Table of Contents

Table of Contents

500-Watt VHF Low Band Transmitter Table of Contents325A, Rev. 0 i August 1, 2002TABLE OF CONTENTSCHAPTER 1 INTRODUCTION SECTION PAGE1.1 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 Axcera 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 VHF Amplifier Tray.......................................................................2-62.3 Input and Remote Connections...............................................................2-72.4 AC Input............................................................................................2-10CHAPTER 3 CIRCUIT DESCRIPTIONS3.1 Low-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...........................................................3-163.1.9 Visual/Aural Metering Board........................................................3-213.1.10 Channel Oscillator Assembly, Dual Oven.....................................3-233.1.11 EEPROM FSK Identifier Board ....................................................3-233.1.12 IF Attenuator Board..................................................................3-243.2 VHF Low-Band 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 Low-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...............................................................5-3
500-Watt VHF Low Band Transmitter Table of Contents325A, Rev. 0 ii August 1, 2002TABLE OF CONTENTS (continued) SECTION PAGE5.5 Linearity Corrector Adjustment...............................................................5-35.6 Phase and Gain Adjustment of the VHF Amplifier Trays .............................5-45.7 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 Low-Band VHF Amplifier Tray ...............................................................5-65.11.1 AGC Control Board .....................................................................5-75.11.2 Phase Shifter Board....................................................................5-75.11.3 VHF Filter/Amplifier Board...........................................................5-75.11.4 Low-Band VHF Amplifier Board ....................................................5-75.11.5 Overdrive Protection Board .........................................................5-75.11.6 3-Way Splitter Board .................................................................5-75.11.7 Low-Band Amplifier Board...........................................................5-85.11.8 3-Way Combiner Board...............................................................5-85.11.9 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.................................................................5-95.12.3 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.................................................5-105.12.6 Sync Tip Clamp/Modulator Board ...............................................5-105.12.7 Aural IF Synthesizer Board, 4.5 MHz ..........................................5-135.12.8 ALC Board (Part 1 of 2).............................................................5-135.12.9 IF Phase Corrector Board ..........................................................5-145.12.10 ALC Board, NTSC (Part 2 of 2).................................................5-145.12.11 Channel Oscillator Board, Dual Oven ........................................5-155.12.12 x2 Multiplier Board .................................................................5-165.12.13 VHF Filter/Mixer Board............................................................5-165.12.14 Low-Band VHF Filter/Amplifier Board ........................................5-16APPENDICESAPPENDIX A SYSTEM SPECIFICATIONSAPPENDIX B SAMPLE LOG REPORT SHEETAPPENDIX C BLOCK DIAGRAM/INTERCONNECT DRAWINGSAPPENDIX D SUBASSEMBLY DRAWINGS

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