User's Manual

300-Watt Digital UHF Transmitter Table of Contents
DT830A, Rev. 1 i
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Manual Overview...................................................................................1-1
1.2 Assembly Designation Numbers ..............................................................1-1
1.3 Safety..................................................................................................1-1
1.4 Maintenance .........................................................................................1-2
1.5 Material Return Procedure ......................................................................1-2
1.6 Warranty for Axcera Products – Limited One-Year Warranty ......................1-3
CHAPTER 2 SYSTEM DESCRIPTION
2.1 System Overview .................................................................................2-1
2.1.1 8-VSB Modulator Tray...................................................................2-1
2.1.2 UHF Digital Exciter Tray ................................................................2-1
2.1.3 UHF Digital RF Output Components................................................2-2
2.1.4 Transmitter Power Requirements ...................................................2-2
2.2 Control and Status ................................................................................2-3
2.2.1 8-VSB Digital Modulator................................................................2-3
2.2.2 UHF Digital Exciter Tray ................................................................2-4
2.2.3 UHF Amplifier Trays......................................................................2-6
2.3 Remote Connections..............................................................................2-7
CHAPTER 3 INSTALLATION AND SETUP PROCEDURES
3.1 Site Considerations................................................................................3-1
3.2 Unpacking the Cabinets .........................................................................3-4
3.3 Installation of the Cabinets and Trays......................................................3-5
3.4 Setup and Operation Procedures.............................................................3-5
CHAPTER 4 CIRCUIT DESCRIPTIONS
4.1 UHF Exciter Tray ...................................................................................4-1
4.1.1 UHF Filter....................................................................................4-1
4.1.2 UHF Generator Board ...................................................................4-1
4.1.3 10-MHz Reference Generator Board ...............................................4-1
4.1.4 PLL Board....................................................................................4-2
4.1.5 Power Entry Module Assembly .......................................................4-4
4.1.6 IF Phase Corrector Board ..............................................................4-4
4.1.7 ALC Board ...................................................................................4-6
4.1.8 Visual/Aural Metering Board ........................................................ 4-12
4.1.9 UHF Upconverter Board .............................................................. 4-13
4.1.10 Transmitter Control Board ......................................................... 4-15
4.1.11 +12V(4A)/-12V(1A) Power Supply Board .................................... 4-19
4.1.12 5-Section Delay Equalizer Board, 44 MHz.................................... 4-20