Barrett 2000 Series Manuals

Manuals and User Guides for Barrett 2000 Series. We have 1 Barrett 2000 Series manual available for free PDF download: Technical Manual

Barrett 2000 Series Technical Manual (80 pages)

HF TRANSCEIVERS AND RECEIVERS

Brand: Barrett | Category: Transceiver | Size: 1 MB

Table of Contents
2
Specification
5
General Specifications
5
Receiver Specifications
6
Transmitter Specifications
7
Barrett 2040, Barrett 2050 Compliance
8
FCC RF Exposure Compliance Statement
8
FCC RF Exposure Warning
9
FCC Modulation Modes
9
Industry Canada Modulation Modes
9
Introduction
11
The Use of DSP in the Receiver
11
The Use of DSP in the Transmitter
11
Other Refinements
11
Overview
12
Control Head
12
Microprocessor/ RF Audio PCB
12
Microprocessor Section
12
RF Section
12
Power Amplifier PCB
13
Technical Description
14
Microprocessor / RF PCB - Microprocessor Section
14
Reference Oscillator 22.7275 Khz
14
Microprocessor
14
DDFS and VCO
14
Vco
14
Phase Detector
14
VCO Divider Ratio
15
Selcall (if Enabled)
15
Audio Mute
15
Audio Filtering
15
Noise Reduction
15
Microprocessor / RF PCB - RF Section
15
First Mixer
16
Post Mixer Amplifier Q5
16
First if Filter F1, F2
16
Second Mixer U48
16
455 Khz if Amplifier
17
Agc
17
Carrier Insertion Generator
17
Third Mixer (Product Detector)
17
Speaker Output
17
Tones
18
Transmit
18
Microphone Input. Remote Head / Front Panel
18
Line Input
18
Microphone / Line Input Selection
18
Compression
18
Transmit Tones
19
Post DSP (Transmit Direction)
19
455 Khz if Processing
19
Second Mixer
19
First Mixer
19
Noise Blanker
19
Power Amplifier (PA) PCB
20
Gain Control Amp
20
Relays
20
Low Pass Filters
20
ALC Control
20
Over-Voltage and Reverse Voltage Protection
21
Auxiliary Antenna Socket
21
Receiver RF Amplifier
21
Control Head - Front Panel
22
Microphone - Speaker
22
Maintenance
23
Introduction
23
Opening the 2050 for PCB Access
23
Opening the 2040 for PCB Access
27
Printed Circuit Board (PCB) Maintenance
30
Component Replacement
30
CMOS Devices
30
Transmitter Power Amplifier Maintenance Precautions
31
Fault Diagnosis
32
General
32
Specific Faults
32
Transceiver will Not Power up
32
After Power up the "Barrett Logo" Screen Stays on
33
Transceiver will Not Receive but Displays OK
33
No Receiver Noise
33
Receiver Noise Present, but Does Not Receive
33
Main Microprocessor Faults
34
VCO Faults
34
Transmitter Faulty
34
Expected Signal Levels
35
Adjustments
37
Front Panel
37
Master Oscillator Frequency Adjustment
37
Microprocessor/ RF Audio PCB
37
VCO Frequency Adjustment
37
45Mhz if Filter
38
Power Amplifier (PA) PCB
38
Driver Bias Setup
38
Power Amplifier (PA) Bias Setup
39
Software Options
40
Internal Jumper Settings
40
Internal PCB Options
40
Pactor III Modem
40
Clover 2000 Modem
40
Features and Configurations Unique to Transceiver Models
40
Barrett 2050 Receivers
40
Barrett 2040 Manpack Adaptor
41
Base PCB
41
Front Panel PCB
41
Internal Charger PCB
42
Specifications
42
Automatic Antenna Tuner PCB
43
Introduction
43
Tuning Network
43
Pad and Phase Detector
43
Current Sense
43
Impedance Transformer
43
Microprocessor
43
Tuning Algorithm
44
Specifications
44
Rear Panel Connectors
45
Auxiliary Connector
46
GPS Connector
47
Fan Connector
47
Automatic Antenna
47
Power Connector
47
Circuit Diagrams and Overlays
48
2050 Transceiver
48
2040 Manpack Adaptor
48
Parts Lists
49
2050 Transceiver - Micro Processor / RF PCB
49
2050 Transceiver - Power Amplifier PCB
63
2050 Transceiver - Front Panel PCB
69
2050 Transceiver - Rear Panel PCB
69
2050 Transceiver - Control Head and Display Transition Pcb's
70
2050 Transceiver - Control Head Transition PCB
73
2040 Manpack Adapter - Front Panel PCB
74
2040 Manpack Adapter - Base PCB
76
2040 Manpack Adapter - Automatic Antenna Tuner PCB
77
2040 Manpack Adapter - Internal Charger PCB
79

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