Codan NGT 2020 Manuals

Manuals and User Guides for Codan NGT 2020. We have 1 Codan NGT 2020 manual available for free PDF download: Technical & Service Manual

Codan NGT 2020 Technical & Service Manual

Codan NGT 2020 Technical & Service Manual (840 pages)

Transceiver System

Brand: Codan | Category: Transceiver | Size: 44.3 MB

Table of Contents

Table of Contents

3
List of Figures

13
- About this Manual
  
  25
  - Standards and Icons
    28
  - Definitions
    29
    
    Acronyms and Abbreviations
    29
    
    Glossary
    35
    
    Circuit Reference Designations
    37
    
    Units
    38
    
    Unit Multipliers
    39
  - About this Issue
    40
    
    The 2011
    40
- Compliance
  
  41
- Maintenance
  
  49
  - General
    49
  - CMOS Devices
    50
  - Circuit Boards
    50
  - Transmitter Precautions
    52
  - Probe Precautions
    52
- Contact Information
  
  53
- Ordering Information
  
  55
  - Component Substitution
    56
- NGT-Index
  
  57
- NGT-Overview and Specifications
  
  64
- NGT-Brief Description
  
  86
  - General Information
    89
  - Transmit Path
    91
    
    Handset Transmit Path
    91
    
    Junction Box Transmit Path
    91
    
    RF Unit Transmit Path
    91
  - Receive Path
    92
    
    RF Unit Receive Path
    92
    
    Junction Box Receive Path
    92
  - Synthesiser Operation
    93
  - Control and Switching
    93
- NGT-Brief Description (2011/2012)
  
  96
  - General Information
    99
  - Transmit Path
    100
    
    Handset Transmit Path
    100
    
    RF Unit Transmit Path
    100
  - Receive Path
    101
    
    RF Unit Receive Path
    101
  - Synthesiser Operation
    102
  - Control and Switching
    102
- NGT-Technical Description
  
  104
  - Power on
    104
  - Power off
    105
  - Supply Voltages
    106
    
    Handset
    106
    
    Junction Box
    106
    
    RF Unit
    107
  - Transmit Path
    109
    
    Handset Microphone Amplifier Transmit Path
    109
    
    Junction Box Transmit Path
    109
    
    Figure 19: Representation of the Waveform as Measured at TP2
    110
    
    Codan Interconnect Bus Transmit Path
    111
    
    RF Unit-Audio Interface PCB Transmit Path
    111
    
    RF Unit-Application Processor PCB Transmit Path
    112
    
    Figure 20: Representation of Compression Function by IC5
    112
    
    RF Unit-RF/IF PCB Transmit Path
    113
    
    RF Unit-PA PCB Transmit Path
    115
  - Receive Path
    121
    
    Input Low-Pass Filters
    121
    
    Broadcast Filter and RF Amplifier
    121
    
    First Mixer
    121
    
    45 Mhz Band-Pass Filter and Amplifier
    121
    
    Second Mixer
    122
    
    Noise Limiter
    122
    
    455 Khz Filter and if Amplifier
    123
    
    Automatic Gain Control
    124
    
    Demodulator
    125
    
    RF Unit-Audio Interface PCB Receive Path
    125
    
    Codan Interconnect Bus Receive Path
    126
    
    Junction Box Receive Path
    126
  - Frequency Control
    127
    
    Reference Oscillator
    127
    
    Oven Controller
    127
    
    Direct Digital Synthesis
    128
    
    VCO and Phase Lock Loop
    129
    
    26 V Power Supply
    129
  - Microprocessors and Control
    130
    
    Handset Microprocessor and Control
    130
    
    Junction Box Microprocessor and Control
    131
    
    RF Unit Microprocessors and Control
    132
    
    Desk Console
    134
  - Internal Voice Encryptor
    135
  - Second if Filter Option
    136
- NGT-Technical Description (2011/2012)
  
  136
  - Power on
    138
  - Power off
    139
  - Supply Voltages
    140
    
    Handset
    140
    
    RF Unit
    140
  - Transmit Path
    143
    
    Handset Microphone Amplifier Transmit Path
    143
    
    RF Unit-Audio & Interconnect PCB (2011)/Audio Interconnect & Data I/O PCB
    143
    
    RF Unit-Application Processor Handset I/F 3 V PCB (2011)/Application Processor Handset & Data I/F PCB (2012) Transmit Path
    144
    
    RF Unit-RF/IF PCB Transmit Path
    144
    
    Figure 21: Representation of Compression Function by IC7
    144
    
    RF Unit-PA PCB Transmit Path
    147
  - Receive Path
    150
    
    Input Low-Pass Filters
    150
    
    Broadcast Filter and RF Amplifier
    150
    
    First Mixer
    150
    
    45 Mhz Band-Pass Filter and Amplifier
    150
    
    Second Mixer
    151
    
    Noise Limiter
    151
    
    455 Khz Filter and if Amplifier
    151
    
    Automatic Gain Control
    152
    
    Demodulator
    153
    
    RF Unit-Audio & Interconnect PCB (2011)/Audio Interconnect & Data I/O PCB
    153
  - Frequency Control
    155
    
    Reference Oscillator
    155
    
    Oven Controller
    155
    
    Direct Digital Synthesis
    155
    
    VCO and Phase Lock Loop
    156
    
    26 V Power Supply
    157
  - Microprocessors and Control
    158
    
    Handset Microprocessor and Control
    158
    
    RF Unit-Microprocessors and Control
    159
  - Internal Voice Encryptor
    162
- NGT-Channel Additions
  
  163
  - General
    164
    
    Options
    164
    
    Figure 22: Position of TPE Link on the Microprocessor PCB in the Junction Box
    165
    
    Figure 23: Position of TPE Link on the Application Processor Handset I/F 3 V PCB
    165
    
    Figure 24: Position of TPE Link on the Application Processor Handset & Data I/F PCB
    166
  - Programming Channels
    168
    
    Creating a Channel
    168
    
    Creating a Channel with the Txd Option
    171
    
    Renaming a Channel
    173
    
    Copying a Channel
    175
    
    Editing a Channel
    176
    
    Deleting a Channel
    178
- NGT-Checks and Adjustments
  
  180
  - Test Equipment Required
    180
  - Voltage Regulators
    181
    
    Handset Voltages
    181
    
    Junction Box Voltages
    181
    
    RF Unit Voltages
    182
  - Crystal Oven
    186
  - Low-Pass Filters
    186
  - Service Mode
    187
    
    General
    187
    
    Accessing Service Mode
    188
    
    Figure 25: Position of Link 11 on the Microprocessor PCB in the Junction Box
    188
  - In the 2011
    189
  - Figure 26: Position of Link a on the Application Processor Handset I/F 3 V PCB in
    189
  - Figure 27: Position of Link a on the Application Processor Handset & Data I/F PCB
    189
    
    Returning to Normal Mode
    192
  - Testing the Keypad and Display
    193
  - Adjustment Locations and Test Points
    194
  - Figure 28: RF/IF PCB in the RF Unit (08-05261)
    194
  - Figure 29: RF/IF PCB in the RF Unit (08-05889)
    195
  - Figure 30: PA PCB in the RF Unit (08-05415 or 08-05511)
    195
  - Figure 31: PA PCB in the RF Unit (08-05869)
    196
  - Figure 32: PA PCB in the RF Unit (08-06461)
    196
  - Figure 33: Filter and Control PCB in the RF Unit (08-05416)
    197
  - Figure 34: Filter and Control PCB in the RF Unit (08-05910)
    197
  - Figure 35: Audio Interface PCB in the RF Unit (08-05266, 2010 Only)
    198
  - Checking the Voltage-Controlled Oscillator
    200
  - Aligning the 45 Mhz Filters
    201
    
    Aligning the Rx Filter
    201
    
    Aligning the Tx Filter
    202
  - Aligning the 455 Khz if and Noise Limiter
    203
  - Adjusting the Exciter Output Level
    204
  - Adjusting Carrier Re-Insertion
    205
  - Adjusting the Exciter Output Spurious Balance
    206
  - Adjusting Frequency
    207
  - Adjusting Mute
    209
  - Adjusting the PA
    210
    
    Adjusting the Driver Bias
    210
    
    Adjusting High Output Power
    214
    
    Adjusting Low Output Power
    216
    
    Adjusting the Bias Gain
    216
    
    Adjusting the Active Bias
    218
    
    Adjusting Balance Control
    219
    
    Checking Intermodulation
    221
    
    Adjusting the PA Gain
    223
  - Checking Performance of the Receiver
    224
    
    Checking the Sensitivity and (Signal+Noise)/Noise Ratio
    224
    
    Checking the AGC
    225
    
    Checking the Audio Output
    225
    
    Checking the Selectivity
    226
    
    Checking the Noise Limiter
    227
  - Checking Performance of the Transmitter
    228
    
    Checking the Transmit Frequency
    228
    
    Checking the ALC
    228
    
    Checking Power Output and Intermodulation
    229

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