Codan Radio Communications UT-3-460-S08 User Manual
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 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
2.3
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 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
Reference Frequency Alignment.............................................3-6
3.5.6
Jumper Configuration.........................................................................3-7