System Description

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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

Summary of content (4 pages)

PAGE 1
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.....................................................................................
PAGE 2
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 ..............
PAGE 3
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.
PAGE 4
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...................