User's Guide

Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 935 MHz iii
TABLE OF CONTENTS
Page
1 GENERAL .............................................................................................................................1-1
1.1 Introduction ...................................................................................................................1-1
1.2 OS(R/T)-3(A/H) Enhanced Synthesizer Family Models ..............................................1-1
1.3 Performance Specifications...........................................................................................1-3
1.4 Printed Circuit Board Numbering Convention..............................................................1-4
2 THEORY OF OPERATION..................................................................................................2-1
2.1 Internal Power and Control (Digital Board)..................................................................2-1
2.2 Synthesizer Analog Circuitry (Analog Board)..............................................................2-1
2.2.1 Common Analog Board Circuitry .....................................................................2-1
2.2.2 29 - 71.4 MHz Analog Board Circuitry ............................................................2-3
2.2.3 118 - 159.4 MHz Multichannel AM Analog Board Circuitry ..........................2-3
2.2.4 128 - 174 MHz Analog Board Circuitry ...........................................................2-4
2.2.5 406 - 470 MHz Analog Board Circuitry ...........................................................2-5
2.2.6 928 - 935 MHz Analog Board Circuitry ...........................................................2-6
2.3 Synthesizer Digital Circuitry (Digital Board) ...............................................................2-7
2.4 Frequency Control.........................................................................................................2-7
2.4.1 BCD Switch Frequency Control .......................................................................2-7
2.4.2 Frequency Select Handle Frequency Control....................................................2-8
2.5 Synthesizer Base and Frequency Increment Table .......................................................2-8
2.6 5.0/6.25 kHz Channelization.........................................................................................2-9
2.7 8.333 kHz Channelization. ............................................................................................2-9
2.8 12.5 kHz Channelization. ............................................................................................2-10
3 SYNTHESIZER ALIGNMENT ............................................................................................3-1
3.1 General ..........................................................................................................................3-1
3.2 Repair Note ...................................................................................................................3-1
3.3 Recommended Test Equipment ....................................................................................3-1
3.4 OS(R/T)-3(A/H) Synthesizer Factory Configuration....................................................3-1
3.5 OS(R/T)-3(A/H) Synthesizer Alignment ......................................................................3-2
3.5.1 General ..............................................................................................................3-2
3.5.2 Synthesizer Test Points .....................................................................................3-2
3.5.3 Synthesizer Removal and Installation ...............................................................3-3
3.5.4 Circuit Board Removal......................................................................................3-3
3.5.5 Frequency Adjustment and Channel Selection .................................................3-3
3.5.5.1 VHF OS(R/T)-3H 29 - 71.4 MHz VCO Alignment ..........................3-4
3.5.5.2 VHF OS(R/T)-3A 118 - 159.4 MHz Alignment................................3-5
3.5.5.3 VHF OS(R/T)-3H 128 - 174 MHz VCO Alignment .........................3-5
3.5.5.4 UHF OS(R/T)-3H 406 - 470 MHz VCO Alignment .........................3-6
3.5.5.5 UHF OS(R/T)-3H 928 - 935 MHz VCO Alignment .........................3-6
3.5.5.6 Reference Frequency Alignment........................................................3-7
3.5.6 Jumper Configuration........................................................................................3-8
4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS.........................................................4-1