User's Manual

2650 Watt VHF High Band Transmitter Table of Contents
435B, 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 Limited One-Year Warranty for Axcera Products.......................................1-3
CHAPTER 2 SYSTEM DESCRIPTION AND REMOTE INTERFACE CONNECTIONS
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 High Band Amplifier Tray........................................................2-5
2.3 Input Connections.................................................................................2-6
2.4 AC Input to the transmitter....................................................................2-6
2.5 Remote Interface Connections ...............................................................2-6
CHAPTER 3 INSTALLATION AND SETUP PROCEDURES
3.1 Site Considerations ...............................................................................3-1
3.2 Unpacking the Cabinets and Trays..........................................................3-4
3.3 Installing the Cabinets and Trays............................................................3-5
3.4 Setup and Operation.............................................................................3-6
CHAPTER 4 CIRCUIT DESCRIPTIONS
4.1 VHF High Band Exciter ...............................................................................4-1
4.1.1 Aural IF Synthesizer Board, 4.5 MHz ...................................................4-1
4.1.2 Sync Tip Clamp/Modulator Board ........................................................4-2
4.1.3 Delay Equalizer Board........................................................................4-6
4.1.4 IF Carrier Oven Oscillator Board..........................................................4-6
4.1.5 ALC Board, NTSC ..............................................................................4-7
4.1.6 IF Phase Corrector Board ................................................................. 4-13
4.1.7 VHF Mixer/Amplifier Enclosure Assembly............................................ 4-15
4.1.8 Transmitter Control Board................................................................ 4-17
4.1.9 Visual/Aural Metering Board ............................................................. 4-22
4.1.10 Channel Oscillator Assembly, Dual Oven .......................................... 4-23
4.1.11 (Optional) EEPROM FSK Identifier Board .......................................... 4-23
4.1.12 (Optional) IF Attenuator Board........................................................ 4-24
4.2 VHF High Band Amplifier Trays................................................................... 4-24
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 VHF High Band 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