System Description

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100 Watt High Band VHF Transmitter Table of Contents

420A, Rev. 0 i

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Manual Overview........................................................................................1-1

1.2 Safety .......................................................................................................1-1

1.3 Maintenance ..............................................................................................1-2

1.4 Material Return Procedure ...........................................................................1-2

1.5 Warranty for Broadcast Products – Limited One-Year Warranty .......................1-3

CHAPTER 2 SYSTEM DESCRIPTION

2.1 420A System Overview ...............................................................................2-1

2.1.1 Exciter Section ..................................................................................2-1

2.1.2 Upconverter Section ..........................................................................2-2

2.1.3 Amplifier Section ...............................................................................2-2

2.1.4 Bandpass Filter Assembly...................................................................2-3

2.1.5 Operational Voltages..........................................................................2-3

2.1.6 Configuration of the Power Entry Module AC Input ................................2-3

2.1.7 Control and Status.............................................................................2-4

2.1.8 Input and Remote Connections ...........................................................2-7

CHAPTER 3 INSTALLATION AND SETUP PROCEDURES

3.1 Site Considerations.....................................................................................3-1

3.2 Unpacking the Cabinets and Trays................................................................3-4

3.3 Installation of the Trays Not Supplied With the Cabinet...................................3-5

3.4 Setup and Operation Procedures ..................................................................3-7

CHAPTER 4 DETAILED ALIGNMENT PROCEDURES

4.1 Alignment of the 420A Transmitter...............................................................4-1

4.1.1 Baseband Section..............................................................................4-1

4.1.2 IF/Converter Section..........................................................................4-2

4.1.3 Amplifier Section of the Tray...............................................................4-2

4.1.4 Linearity Corrector Adjustment ...........................................................4-3

4.1.5 IF Phase Corrector Adjustment ...........................................................4-3

4.1.6 Calibration of the Output Power Level..................................................4-4

4.2 Board Level Alignment Procedures................................................................4-5

4.2.1 (Optional) 4.5 MHz Composite Input Kit...............................................4-5

4.2.2 Delay Equalizer Board........................................................................4-5

4.2.3 Composite 4.5 MHz Filter Board ..........................................................4-6

4.2.4 (Optional) 4.5 MHz Bandpass Filter Board ............................................4-5

4.2.5 IF Carrier Oven Oscillator Board..........................................................4-6

4.2.6 Sync Tip Clamp/Modulator Board ........................................................4-6

4.2.7 Aural IF Synthesizer Board, 4.5 MHz....................................................4-8

4.2.8 ALC Board (Part 1 of 2)......................................................................4-9

4.2.9 IF Phase Corrector Board .................................................................4-10

4.2.10 ALC Board, NTSC (Part 2 of 2) ........................................................4-10

4.2.11 Channel Oscillator Board ................................................................4-11

4.2.12 x4 Multiplier Board.........................................................................4-11

Summary of content (4 pages)

PAGE 1
00 Watt High Band VHF Transmitter Table of Contents TABLE OF CONTENTS CHAPTER 1 INTRODUCTION 1.1 1.2 1.3 1.4 1.5 Manual Overview ........................................................................................1-1 Safety .......................................................................................................1-1 Maintenance ..............................................................................................1-2 Material Return Procedure .....................................
PAGE 2
100 Watt High Band VHF Transmitter Table of Contents TABLE OF CONTENTS (continued) 4.2.13 4.2.14 4.2.15 4.2.16 4.2.17 4.2.18 4.2.19 4.2.20 Filter/Mixer Board .......................................................................... 4-11 Filter/Amplifier Board, High Output.................................................. 4-12 High-Band Amplifier Boards ............................................................ 4-12 Frequency Adjustment of the High Band Amplifier Boards ..................
PAGE 3
100 Watt High Band VHF Transmitter Table of Contents LIST OF FIGURES 3-1 3-2 3-3 1 kW Minimum Ventilation Configuration................................................3-4 Chassis Trak Cabinet Slides ..................................................................3-5 Cabinet Mounting Diagram ...................................................................3-6 4-1 Waveform...........................................................................................4-7 420A, Rev.
PAGE 4
100 Watt High Band VHF Transmitter Table of Contents LIST OF TABLES 2-1 2-2 2-3 2-4 2-5 2-6 2-7 Meters................................................................................................2-5 Switches.............................................................................................2-6 Adjustments .......................................................................................2-6 Control Indicators................................................................................