Codan Radio Communications VT-3-150-SN User Manuals

Table of Contents

• 1GENERAL

  5
  • 1.1Introduction

    5
  • 1.2Manual Organization

    5
  • 1.3VT-3 132 - 174 MHz Transmitter Family Models

    6
  • 1.4Performance Specifications

    7
  • 1.4.1General

    7
  • 1.4.2Audio Specifications

    8
  • 1.4.3Physical Specifications

    9
• 2SYSTEM OVERVIEW

  10
  • 2.1Transmitter Operation

    10
  • 2.2Frequency Selection

    12
  • 2.2.1Synthesizer Transmitter

    12
  • 2.3Transmitter Assembly and Adjustment

    13
  • 2.3.1Complete Transmitter Alignment

    13
  • 2.3.2Frequency Change

    14
  • 2.3.3Output Power Adjustment

    14
  • 2.3.4Deviation Setting

    15
  • 2.3.5Setting RF Alarm Thresholds

    15
  • 2.4Recommended Test Equipment List

    15
  • 2.5Repair Note

    16
  • 2.6Printed Circuitboard Numbering Convention

    16
• 3ILLUSTRATIONS

  17
  • 3.1MT-3 Transmitter Front Panel

    17
  • 3.2MT-3 Transmitter Case - Exploded View

    18
• 4PARTS LIST

  19
• 5REVISION HISTORY

  21
  • 1GENERAL

    29
    • 1.1Introduction

      29
    • 1.2Performance Specifications

      29
    • 1.2.1General

      29
    • 1.2.2Audio Specifications

      30
  • 2THEORY OF OPERATION

    31
    • 2.1 Transmitter Main Board

      31
    • 2.1.1General

      31
    • 2.1.2Transmitter Push-To-Talk

      31
    • 2.1.2.1Microphone PTT

      31
    • 2.1.2.2PTT With Time-Out-Timer

      32
    • 2.1.2.3PTT No Time-Out-Timer

      32
    • 2.1.2.4Optional Relay

      32
    • 2.1.2.5PTT Output

      33
    • 2.1.2.6PTT Voltage Switching

      33
    • 2.1.2.7Transmitter Standby Modes

      33
    • 2.1.3Audio Circuits

      34
    • 2.1.3.1Microphone Audio

      35
    • 2.1.3.2Received Audio

      35
    • 2.1.4Channel Selection

      35
    • 2.1.4.1Synthesized Transmitter

      35
    • 2.1.4.2Crystal Controlled Transmitter

      36
    • 2.1.5Amplifier Circuits

      36
    • 2.1.6Time-Out-Timer Circuitry

      36
    • 2.2MT-3 Front Panel Board

      38
    • 2.3MT-3 Audio Processor (Version 1.6)

      38
    • 2.3.1General

      38
    • 2.3.2Power Requirements

      38
    • 2.3.3Audio Processor Turn-on Time

      39
    • 2.3.4Audio Processor Signals

      39
    • 2.3.4.1Audio Processor Outputs

      39
    • 2.3.4.2Audio Processor Modulation Output

      40
    • 2.3.4.3Audio Processor Low Frequency / Direct Mod. Output

      40
    • 2.3.4.4Audio Processor Inputs

      40
    • 2.3.4.5Audio Processor Microphone Input

      41
    • 2.3.4.6Audio Processor Balanced Input

      41
    • 2.3.4.7Audio Processor Auxiliary Input

      41
    • 2.3.4.8Audio Processor Subtone Inputs

      41
    • 2.3.4.9Audio Processor Direct Modulation Input

      42
    • 2.4MT-3 Audio Processor (Version 1.8)

      42
    • 2.4.1General

      42
    • 2.4.2Power Requirements

      42
    • 2.4.3Audio Processor Turn-on Time

      43
    • 2.4.4Audio Processor Signals

      43
    • 2.4.4.1Audio Processor Outputs

      43
    • 2.4.4.2Audio Processor Modulation Output

      44
    • 2.4.4.3Audio Processor Low Frequency / Direct Mod. Output

      44
    • 2.4.4.4Audio Processor Inputs

      44
    • 2.4.4.5Audio Processor Microphone Input

      45
    • 2.4.4.6Audio Processor Balanced Input

      45
    • 2.4.4.7Audio Processor Auxiliary Input

      45
    • 2.4.4.8Audio Processor Subtone Inputs

      45
    • 2.4.4.9Audio Processor Direct Modulation Input

      46
    • 2.5Low Frequency Modulation

      46
  • 3TRANSMITTER ALIGNMENT

    47
    • 3.1General

      47
    • 3.2Repair Note

      47
    • 3.3Printed Circuitboard Numbering Convention

      47
    • 3.4Recommended Test Equipment List

      47
    • 3.5Standard Factory Settings and Jumper Configuration

      48
    • 3.5.1MT-3 Transmitter Board Factory Configuration

      48
    • 3.5.2MT-3 Audio Processor Factory Configuration (Version 1.6)

      49
    • 3.6MT-3 Transmitter Board Alignment

      50
    • 3.6.1General

      50
    • 3.6.2MT-3 Transmitter Board Test Points

      51
    • 3.7Module Installation and Removal

      51
    • 3.8MT-3 Audio Processor Alignment (Version 1.6)

      52
    • 3.8.1General

      52
    • 3.8.2MT-3 Audio Processor Standard Deviation Adjustment

      52
    • 3.9Standard Factory Settings and Jumper Configuration

      54
    • 3.9.1MT-3 Audio Processor Factory Configuration (Version 1.8)

      54
    • 3.10MT-3 Audio Processor Alignment (Version 1.8)

      56
    • 3.10.1General

      56
    • 3.10.2MT-3 Audio Processor Standard Deviation Adjustment

      56
    • 3.11Low Frequency Modulation Configuration

      57
    • 3.11.1MT-3 Transmitters

      57
    • 3.11.2MT-3 Transmitter Audio Processors

      58
    • 3.11.3Synthesizer and Crystal Controlled Oscillator

      59
    • 3.11.4Tuning the Transmitter

      60
  • 4TRANSMITTER INTERCONNECT PIN DEFINITIONS

    61
  • 5ILLUSTRATIONS AND SCHEMATIC DIAGRAMS

    63
    • 5.1Transmitter Block Diagram

      63
    • 5.2Transmitter Main Board Electrical Assembly

      65
    • 5.2.1Transmitter Main Board Top Side Component Layout

      65
    • 5.2.2Transmitter Main Board Bottom Side Component Layout

      66
    • 5.2.3Transmitter Main Board Schematic Diagram

      67
    • 5.3Front Panel Board

      68
    • 5.3.1Front Panel Board Component Layout

      68
    • 5.3.2Front Panel Board Schematic

      69
    • 5.4Audio Processor Electrical Assembly (Version 1.6)

      70
    • 5.4.1Audio Processor Component Layout

      70
    • 5.4.2Audio Processor Schematic Diagram

      71
    • 5.5Audio Processor Electrical Assembly (Version 1.8)

      72
    • 5.5.1Audio Processor Component Layout

      72
    • 5.5.2Audio Processor Schematic Diagram

      73
  • 6PARTS LISTS

    75
    • 6.1Transmitter Main Board Parts List

      75
    • 6.1.1Transmitter Main Board Electrical Parts List

      75
    • 6.1.2Transmitter Main Board Mechanical Parts List

      77
    • 6.1.3MT-3 Front Panel Board Electrical Parts List

      78
    • 6.2MT-3 Audio Processor Parts List (Version 1.6)

      78
    • 6.2.1MT-3 Audio Processor Electrical Parts List (Version 1.6)

      78
    • 6.3MT-3 Audio Processor Parts List (Version 1.8)

      80
    • 6.3.1MT-3 Audio Processor Electrical Parts List (Version 1.8)

      80
  • 7REVISION HISTORY

    83
  • 1 FM AUDIO PROCESSOR

    89
    • 1.1 Introduction

      89
    • 1.2 Block Diagram (FM Audio Processor)

      91
    • 1.3 FM Audio Processor Board Pin Connections

      92
    • 1.4 Factory Configuration

      92
    • 1.5 Turn-on Time

      93
    • 1.6 Low Frequency Modulation

      93
    • 1.7 Transmitter Standby Modes

      93
  • 2 SIGNALS

    95
    • 2.1 FM Audio Processor Outputs

      95
    • 2.2 Modulation Output

      95
    • 2.3 Low Frequency / Direct Mod. Output

      95
    • 2.4 Microphone Input

      95
    • 2.5 Balanced Input

      95
    • 2.6 Auxiliary Input

      96
    • 2.7 Subtone Inputs

      96
    • 2.8 Direct Modulation Input

      96
  • 3 THEORY OF OPERATION

    97
  • 4 ALIGNMENT

    101
    • 4.1 Standard Deviation Adjustment

      101
    • 4.2 Balanced Input Setup

      101
    • 4.3 Microphone Input Setup

      101
    • 4.4 Subtone Input Setup

      102
    • 4.5 Balanced Input Frequency Response

      102
  • 5 TROUBLESHOOTING - TEST EQUIPMENT NEEDED

    103
    • 5.1 Balanced Input Test

      103
    • 5.2 Frequency Response Test

      103
    • 5.3 Subtone Input Test

      104
    • 5.4 Audio benchmarks

      104
  • 6 TEMPERATURE COMPENSATION

    105
  • 7 ILLUSTRATIONS, TABLES AND SCHEMATIC DIAGRAMS

    107
    • 7.1 Special Jumper Configuration Table

      107
    • 7.2 FM Audio Processor Component Layout

      108
    • 7.3 FM Audio Processor Schematic Diagram

      109
  • 8 FM AUDIO PROCESSOR PARTS LIST

    111
  • 9 AM AUDIO PROCESSOR

    115
    • 9.1 Introduction

      115
    • 9.2 Performance Specifications

      115
    • 9.3 Audio Specifications

      116
    • 9.4 Audio Circuits

      116
    • 9.5 Power Requirements

      116
    • 9.6 Transmitter Standby Modes

      116
    • 9.7 Audio Circuitry

      117
    • 9.8 AM Audio Processor Factory Configuration

      118
    • 9.9 AM Audio Processor Alignment

      118
    • 9.10 AM Audio Processor Electrical Parts List

      121
    • 9.11 AM Audio Processor Component Layout

      124
    • 9.12 AM Audio Processor Schematic Diagram

      125
  • 10 REVISION HISTORY

    127
  • 1GENERAL

    135
    • 1.1Introduction

      135
    • 1.2Performance Specification

      135
  • 2THEORY OF OPERATION

    137
    • 2.1Amplifier Operation

      137
    • 2.2Power Requirements

      137
    • 2.3RF Circuitry

      138
    • 2.3.1VT-3/150 Lowpass Filter

      138
    • 2.4Power Control Circuitry

      138
    • 2.5Power Sensing Circuitry

      139
    • 2.5.1Output Power Sense

      139
    • 2.5.2VSWR Sense

      139
    • 2.5.3VSWR Overload

      140
  • 3VT-3/150 AMPLIFIER ALIGNMENT

    141
    • 3.1General

      141
    • 3.2Repair Note

      141
    • 3.3Recommended Test Equipment List

      141
    • 3.4Printed Circuitboard Numbering Convention

      142
    • 3.5Standard Factory Settings and Jumper Configuration

      142
    • 3.6VT-3/150 Amplifier Alignment

      142
    • 3.6.1General

      142
    • 3.6.2VT-3/150 Amplifier Adjustment

      143
    • 3.6.2.1General Set-Up

      143
    • 3.6.2.2Output Power Alarm (Forward Power)

      144
    • 3.6.2.3Output Power

      145
    • 3.6.2.4Antenna VSWR Alarm (Reverse Power)

      145
    • 3.6.2.5Antenna VSWR Overload

      146
    • 3.6.2.6Procedure Verification

      146
  • 4ILLUSTRATIONS AND SCHEMATIC DIAGRAMS

    147
    • 4.1VT-3/150 VHF Amplifier Component Layout

      148
    • 4.2VT-3/150 VHF Amplifier Schematic Diagram

      149
    • 4.3VT-3/150 VHF Lowpass Filter Component Layout

      151
    • 4.4VT-3/150 VHF Lowpass Filter Schematic Diagram

      151
  • 5PARTS LISTS

    153
    • 5.1VT-3/150 Amplifier Electrical Parts List

      153
    • 5.2VT-3/150 Low Pass Filter Electrical Parts List

      155
    • 5.3VT-3/150 Amplifier Mechanical Parts List

      155
  • 6REVISION HISTORY

    157
  • 1. GENERAL

    163
    • 1.1 Introduction

      163
    • 1.2 OS(R/T)-3(A/H) Enhanced Synthesizer Family Models

      163
    • 1.3 Performance Specifications

      165
    • 1.4 Printed Circuit Board Numbering Convention

      167
  • 2. THEORY OF OPERATION

    169
    • 2.1 Internal Power and Control (Digital Board)

      169
    • 2.2 Synthesizer Analog Circuitry (Analog Board)

      169
    • 2.2.1 Common Analog Board Circuitry

      169
    • 2.2.2 29 - 71.4 MHz Analog Board Circuitry

      171
    • 2.2.3 118 - 159.4 MHz Multichannel AM Analog Board Circuitry

      171
    • 2.2.4 128 - 174 MHz Analog Board Circuitry

      172
    • 2.2.5 406 - 470 MHz Analog Board Circuitry

      173
    • 2.3 Synthesizer Digital Circuitry (Digital Board)

      174
    • 2.4 Frequency Control

      174
    • 2.4.1 BCD Switch Frequency Control

      174
    • 2.4.2 Frequency Select Handle Frequency Control

      175
    • 2.5 Synthesizer Base and Frequency Increment Table

      175
    • 2.6 5.0/6.25 kHz Channelization.

      176
    • 2.7 8.333 kHz Channelization.

      176
    • 2.8 12.5 kHz Channelization.

      177
  • 3. SYNTHESIZER ALIGNMENT

    179
    • 3.1 General

      179
    • 3.2 Repair Note

      179
    • 3.3 Recommended Test Equipment

      179
    • 3.4 OS(R/T)-3(A/H) Synthesizer Factory Configuration

      179
    • 3.5 OS(R/T)-3(A/H) Synthesizer Alignment

      180
    • 3.5.1 General

      180
    • 3.5.2 Synthesizer Test Points

      180
    • 3.5.3 Synthesizer Removal and Installation

      181
    • 3.5.4 Circuit Board Removal

      181
    • 3.5.5 Frequency Adjustment and Channel Selection

      181
    • 3.5.5.1 VHF OS(R/T)-3H 29 - 71.4 MHz VCO Alignment

      182
    • 3.5.5.2 VHF OS(R/T)-3A 118 - 159.4 MHz Alignment

      183
    • 3.5.5.3 VHF OS(R/T)-3H 128 - 174 MHz VCO Alignment

      183
    • 3.5.5.4 UHF OS(R/T)-3H 406 - 470 MHz VCO Alignment

      184
    • 3.5.5.5 Reference Frequency Alignment

      184
    • 3.5.6 Jumper Configuration

      185
  • 4. ILLUSTRATIONS AND SCHEMATIC DIAGRAMS

    187
    • 4.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Diagrams

      187
    • 4.1.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Bottom)

      187
    • 4.1.2 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Top)

      188
    • 4.1.3 OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram

      189
    • 4.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Diagrams

      191
    • 4.2.1 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Bottom)

      191
    • 4.2.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Top)

      192
    • 4.2.3 OS(R/T)-3A 118 - 159.4 MHz Analog Board Schematic Diagram

      193
    • 4.3 OS(R/T)-3H 128 - 174 MHz Analog Board Diagrams

      195
    • 4.3.1 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Bottom)

      195
    • 4.3.2 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Top)

      196
    • 4.3.3 OS(R/T)-3H 128 - 174 MHz Analog Board Schematic Diagram

      197
    • 4.4 OS(R/T)-3H 406 - 470 MHz Analog Board Diagrams

      199
    • 4.4.1 OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout (Bottom)

      199
    • 4.4.2 OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout (Top)

      200
    • 4.4.3 OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram

      201
    • 4.5 OS(R/T)-3(A/H) Digital Board Diagrams

      203
    • 4.5.1 OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)

      203
    • 4.5.2 OS(R/T)-3(A/H) Digital Board Component Layout (Top)

      204
    • 4.5.3 OS(R/T)-3(A/H) Digital Board Schematic Diagram

      205
  • 5. PARTS LISTS

    207
    • 5.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Electrical Parts List

      207
    • 5.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Electrical Parts List

      211
    • 5.3 OS(R/T)-3H 128 - 174 MHz Analog Board Electrical Parts List

      214
    • 5.4 OS(R/T)-3H 406 - 470 MHz Analog Board Electrical Parts List

      217
    • 5.5 OS(R/T)-3(A/H) Digital Board Electrical Parts List

      220
    • 5.6 OS(R/T)-3(A/H) Synthesizer Mechanical Parts List

      221
  • 6. REVISION HISTORY

    223
  • 1.VT-3/140 Channel Designation Table: 132-150MHz, 5kHz Increments

    229
  • 2VT-3/140 Channel Designation Table: 132-150MHz, 6.25kHz Increments

    237
  • 3VT-3/160 Channel Designation Table: 150-174MHz, 5kHz Increments

    243
  • 4VT-3/160 Channel Designation Table: 150-174MHz, 6.25kHz Increments

    253
  • 5REVISION HISTORY

    261