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

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Document ID	265271
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Document Description	Table of Contents
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Document Type	User Manual
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Date Submitted	2002-08-23 00:00:00
Date Available	2002-10-16 00:00:00
Creation Date	2002-08-23 10:42:11
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2002-08-23 10:42:13
Document Title	Table of Contents

500-Watt VHF Low Band Transmitter
Table of Contents
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
SECTION
1.1
1.2
1.3
1.4
1.5
1.6
PAGE
Manual Overview ..................................................................................1-1
Assembly Designation Procedure ............................................................1-1
Safety .................................................................................................1-1
Maintenance.........................................................................................1-2
Material Return Procedure......................................................................1-2
Warranty for Axcera 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 VHF Amplifier Tray .......................................................................2-6
2.3 Input and Remote Connections...............................................................2-7
2.4 AC Input ............................................................................................2-10
CHAPTER 3 CIRCUIT DESCRIPTIONS
3.1 Low-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...........................................................3-16
3.1.9 Visual/Aural Metering Board........................................................3-21
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 VHF Low-Band 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
Low-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
325A, Rev. 0
August 1, 2002
500-Watt VHF Low Band Transmitter
Table of Contents
TABLE OF CONTENTS (continued)
SECTION
PAGE
5.5 Linearity Corrector Adjustment ...............................................................5-3
5.6 Phase and Gain Adjustment of the VHF Amplifier Trays .............................5-4
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 Low-Band VHF Amplifier Tray ...............................................................5-6
5.11.1 AGC Control Board .....................................................................5-7
5.11.2 Phase Shifter Board....................................................................5-7
5.11.3 VHF Filter/Amplifier Board...........................................................5-7
5.11.4 Low-Band VHF Amplifier Board ....................................................5-7
5.11.5 Overdrive Protection Board .........................................................5-7
5.11.6 3-Way Splitter Board .................................................................5-7
5.11.7 Low-Band Amplifier Board...........................................................5-8
5.11.8 3-Way Combiner Board...............................................................5-8
5.11.9 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.................................................................5-9
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.................................................5-10
5.12.6 Sync Tip Clamp/Modulator Board ...............................................5-10
5.12.7 Aural IF Synthesizer Board, 4.5 MHz ..........................................5-13
5.12.8 ALC Board (Part 1 of 2).............................................................5-13
5.12.9 IF Phase Corrector Board ..........................................................5-14
5.12.10 ALC Board, NTSC (Part 2 of 2) .................................................5-14
5.12.11 Channel Oscillator Board, Dual Oven ........................................5-15
5.12.12 x2 Multiplier Board .................................................................5-16
5.12.13 VHF Filter/Mixer Board............................................................5-16
5.12.14 Low-Band VHF Filter/Amplifier Board ........................................5-16
APPENDICES
APPENDIX A SYSTEM SPECIFICATIONS
APPENDIX B SAMPLE LOG REPORT SHEET
APPENDIX C BLOCK DIAGRAM/INTERCONNECT DRAWINGS
APPENDIX D SUBASSEMBLY DRAWINGS
325A, Rev. 0
ii
August 1, 2002

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