User's Manual

300-Watt Digital UHF Transmitter Table of Contents
DT830A, Rev. 1 ii
TABLE OF CONTENTS (continued)
4.2 8-VSB Digital Modulator ....................................................................... 4-20
4.2.1 Vector Modulator Board .............................................................. 4-20
4.2.2 Switch Board ............................................................................. 4-21
4.2.3 Local Oscillator Board ................................................................. 4-21
4.2.4 LED Board ................................................................................. 4-22
4.2.5 VSB Modulator Interface Board.................................................... 4-22
4.2.6 VSB Filter Board......................................................................... 4-22
4.2.7 DC Power Supply Board .............................................................. 4-23
4.2.8 VSB IF Filter Board..................................................................... 4-23
4.2.9 VSB Symbol Generator Board...................................................... 4-23
4.3 UHF Amplifier Trays............................................................................. 4-23
4.3.1 1-Watt Amplifier Board Assembly................................................. 4-23
4.3.2 1-Watt Amplifier Board ............................................................... 4-24
4.3.3 4-Way Splitter Assembly............................................................. 4-24
4.3.4 4-Way Splitter Board .................................................................. 4-24
4.3.5 Coupler Board Assembly ............................................................. 4-25
4.3.6 Dual Peak Detector Enclosure...................................................... 4-25
4.3.7 Dual Peak Detector Board, Single Supply...................................... 4-25
4.3.8 Dual Stage Amplifier Assembly, Mid Band, Class AB....................... 4-26
4.3.9 Generic Dual Stage Amplifier Board, Class AB ............................... 4-27
4.3.10 Amplifier Protection Board ......................................................... 4-27
4.3.11 Amplifier Control Board............................................................. 4-28
4.3.12 Single Stage Amplifier Assembly, Mid Band, Class A..................... 4-30
4.3.13 Generic Single Stage Amplifier Board, Class A ............................. 4-31
4.3.14 Variable Gain/Phase Board Enclosure.......................................... 4-31
4.3.15 Variable Gain/Phase Board ........................................................ 4-32
4.3.16 4-Way Combiner Assembly........................................................ 4-33
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 UHF Exciter Tray ...................................................................................5-1
5.1.1 Delay Equalization Adjustment ......................................................5-2
5.1.2 IF Phase Corrector Adjustment ......................................................5-3
5.1.3 UHF Generator Board ...................................................................5-4
5.1.4 10-MHz Reference Generator Board ...............................................5-4
5.1.5 PLL Board....................................................................................5-4
5.2 UHF Amplifier Trays ..............................................................................5-6
5.2.1 Phase and Gain Adjustment of the UHF Amplifier Trays ....................5-7