Barrett 940 Manuals

Manuals and User Guides for Barrett 940. We have 1 Barrett 940 manual available for free PDF download: Technical Manual

Barrett 940 Technical Manual

Barrett 940 Technical Manual (164 pages)

HF transceivers and receivers

Brand: Barrett | Category: Transceiver | Size: 4.42 MB

Table of Contents

Table of Contents
2
Specifications
5
Introduction
9
Overview
11
- Front Panel
  11
- Microprocessor PCB
  11
- Rf/Audio PCB
  11
- Pa Pcb
  12
- Remote Control Head
  12
- Front Panel
  12
- Connector Transition PCB
  12
Technical Description
13
- Microprocessor PCB
  13
  - Power Supplies
    13
  - Reference Oscillator (Standard)
    13
  - Reference Oscillator (High Stability Option)
    13
  - Microprocessor
    13
  - DDFS and VCO
    15
  - Selcall (if Enabled)
    17
  - Audio Mute
    17
  - PA ALC Control Voltage PWR ADJ
    18
- RF / Audio PCB
  19
  - RF Section
    19
    
    Mhz Low Pass Filter, First Mixer and 45 Mhz if Amplifier
    19
    
    Second Mixer and Bandpass Crystal Filter
    21
    
    Noise Blanker
    21
    
    Noise Gate
    21
    
    Second IF, AGC and Demodulator
    21
    
    Transmit and Receive Switching
    21
  - Audio Section
    21
    
    Audio Path
    22
- Pa Pcb
  24
  - Gain Control Amp
    24
  - Low Pass Filters
    24
  - ALC Control
    24
  - Over-Voltage and Reverse Voltage Protection
    24
  - Auxiliary Antenna Socket
    24
  - Receiver RF Amplifier
    24
  - Power Supply Regulators
    24
- Front Panel
  26
  - LCD and Status Led's
    26
  - Keypad
    26
  - Backlighting
    26
  - Microphone
    26
  - Volume Control and On/Off Switch
    26
- Remote Control Head
  28
Maintenance
30
- Introduction
  30
- Printed Circuit Board (PCB) Maintenance
  30
- Component Replacement
  30
- CMOS Devices
  31
- Transmitter Power Amplifier Maintenance Precautions
  31
- PCB Access
  31
  - Transceivers
    31
  - Remote Control Head
    31
- Fault Diagnosis
  32
- Adjustments
  40
  - Front Panel
    40
  - Microprocessor PCB
    40
    
    Reference Oscillator Setup (Standard Oscillator)
    40
    
    Reference Oscillator Setup (High Stability Oscillator)
    40
    
    VCO Frequency Adjustment
    40
    
    Carrier Insertion Oscillator Peaking
    40
    
    VCO Low Pass Filter
    40
    
    DAC Low Pass Filter
    41
  - RF/ Audio PCB
    41
    
    Input Low Pass Filter
    41
    
    45Mhz if Filter
    41
    
    IF Inductors
    42
    
    Noise Blanker Potentiometer
    42
    
    Carrier Rejection Potentiometer
    42
    
    Transmit Drive Level Set Potentiometer
    42
    
    455Khz if
    42
  - Pa Pcb
    42
    
    Driver Bias Setup
    42
    
    PA Bias Setup
    42
    
    Power Level Adjustment
    43
    
    Programmable Links
    43
Software Programming and Options
44
- Barrett 930 Transceivers
  44
- Barrett 940 Transceivers
  44
- Barrett 950 Transceivers
  44
- Barrett 980 Transceivers
  44
Internal Jumper Settings
45
- Standard Jumpers Locations
  45
- Configuring Antenna Connectors
  45
Internal Options
46
Features and Configurations Unique to Transceiver Models
49
Accessory Interface Unit - P/N BCA90016
53
Auxiliary Connector
54
Circuit Diagrams, Overlays and Parts Lists
57
- Active Component Outlines
  57
- Rf/Audio PCB Overlay
  58
- Rf/Audio Schematic
  59
- Rf/Audio Parts List - Showing Optional Narrow Filter Components
  61
- Microprocessor PCB Overlay
  72
- Microprocessor Schematic
  73
- Microprocessor Parts List
  75
- PA PCB Overlay
  87
- PA Schematic
  89
- PA Parts List
  91
- Front Panel PCB Overlay
  99
- Front Panel Schematic
  100
- Front Panel Parts List
  101
- Remote Control Head PCB Overlay
  103
- Remote Control Head Schematic
  104
- Remote Control Head Parts List
  105
- Scrambler PCB Overlay Barrett P/N BCA94031
  108
- Scrambler Schematic
  109
- Scrambler Parts List
  110
- GPS/ALE Motherboard Overlay
  111
- GPS/ALE Motherboard Schematic
  112
- GPS/ALE Motherboard Parts List
  113
- 950MR Low Pass Filter/Power PCB Overlay
  114
- 950MR Low Pass Filter/Power PCB Schematic
  115
- 950MR Low Pass Filter/Power PCB Parts List
  117
- 980PSU DC/DC Switch Mode Power Supply PCB Overlay
  121
- 980PSU DC/DC Switch Mode Power Supply Schematic
  122
- 980PSU DC/DC Switch Mode Power Supply Parts List
  123
- Series Final Assembly Parts Lists
  125
- Hand Microphone Schematic
  133
- Cloning Cable Schematic
  134
- Programming Cable Schematic
  135
- Chassis Explosion Diagram
  136
- Final Assembly Parts List
  137
- Connector Transition PCB Overlay
  139
- Connector Transition Schematic
  140
- Connector Transition Parts List
  141
- Automatic Antenna Tuner PCB Overlay
  142
- Automatic Antenna Tuner Schematic
  143
- Auto Tuner PCB Parts List
  146
- Automatic Antenna Tuner Final Assembly Parts List (Drab Olive, Periwinkle)
  147
- Tuner Front Panel PCB Overlay
  148
- Tuner Front Panel PCB Schematic
  149
- ATU Front Panel PCB Parts List
  150
- Multiple-Use Distribution Unit Schematic
  151
- Multiple-Use Distribution Unit Parts List
  152
- Battery Charger PCB Parts List
  157
- Transceiver Cloning Cable Schematic
  160
- Handset Lightweight Tactical Schematic
  161
- Transceiver MIC Schematic
  162
- Programming Cable Schematic
  163

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