User's Guide

Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 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 ................................................1-5
2 THEORY OF OPERATION........................................................................................2-1
2.1 Internal Power and Control (Digital Board)....................................................2-1
2.2 Synthesizer Analog Circui try (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
2.3 Synthesizer Digital Circuitry (Digital Board)..................................................2-6
2.4 Frequency Control..........................................................................................2-6
2.4.1 BCD Switch Frequency Control.........................................................2-6
2.4.2 Frequency Select Handle Frequency Control......................................2-7
2.5 Synthesizer Base and Frequency Increment Table ..........................................2-7
2.6 5.0/6.25 kHz Channelization. ..........................................................................2-8
2.7 8.333 kHz Channelization. ..............................................................................2-8
2.8 12.5 kHz Channelization. ................................................................................2-9
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 Con figuration ......................................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 Remova l 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 Reference Frequency Alignment .............................................3-6
3.5.6 Jumper Configuration .........................................................................3-7