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Codan X-2 User Manual
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X-2 Technical Service Manual
Appendices 8-
9
D.3
Unit Multiples
Abbreviation
Prefix
Numeric
Meaning
T
tera
10
12
one million million
G
giga
10
9
one thousand million
M
mega
10
6
one million
k
kilo
10
3
one thousand
h
hecto
10
2
one hundred
da
deca
10
ten
d
deci
10
-1
one tenth
c
centi
10
-2
one hundreth
m
milli
10
-3
one thousandth
µ
micro
10
-6
one millionth
n
nano
10
-9
one thousand millionth
p
pico
10
-12
one million millionth
Table D.3
Abbreviations of
Unit Multiples.
n
78
80
Table of Contents
Default Chapter
3
Table of Contents
3
Publication No:
8
1 Introduction
9
Purpose
9
How this Manual Is Organised
9
Conventions
10
Related Documents
10
Overview
10
Australia
10
Specifications
11
General Specifications
11
Receiver Specifications
13
Transmitter Specifications
14
2 Brief Description
15
General
15
Control and Switching
16
Synthesiser
16
Receive Path
17
Transmit Path
18
3 Operating Instructions
19
Audible Warning Tones
20
4 Technical Description
21
Control and Supply Voltages
22
Power
22
Supply Voltages
22
Receive/Transmit Switching
23
Receiver
24
Input Filters
24
First Mixer
24
45 Mhz Roofing Filter
24
Second Mixer
24
Noise Limiter
25
455 Khz Filter and if Amplifier
25
Automatic Gain Control
26
Mute
27
Volume Control and Audio Amplifier
28
Transmitter Exciter
28
Microphone Compressor
28
Modulator
29
455 Khz Filter and First Mixer
29
45 Mhz Roofing Filter
29
Second Mixer and Exciter Output Filter
29
Local Oscillators
30
Introduction
30
VCO1 and PLL
30
VCO2 and PLL
31
455 Khz Local Oscillator
32
Clarifier
32
Micro and Peripherals
33
Microcontroller
33
I 2 C Bus
33
PA Control Bus
33
Front Panel Controls
34
Tune
35
Tone Generation
35
A/D Inputs
35
Microcontroller Reset
36
PA and Filters
36
Gain Control Stage
37
Predriver Stages
37
Driver Stage
37
Output Stage and Bias Regulator
38
Output Filters and Antenna 1 and 2 Select
38
ALC Control
38
5 Maintenance
41
Introduction
41
General
41
CMOS Devices
41
Circuit Boards
42
Transmitter Precautions
43
Probe Precautions
44
Fault Diagnosis
44
General
44
Voltage Measurements
45
No Reception
46
Transmitter Failure
47
PA Failure
48
Dismantling and Assembling
48
General
48
Top and Bottom Covers
49
Rx/Exciter & Control PCB
49
Front Panel PCB
49
PA and Filter Assembly
50
Replacement of PA Transistors
51
6 Channel Additions
53
7 Adjustments
55
Introduction
55
Test Equipment Required
55
Voltage Regulators
55
Crystal Oven
56
Test Mode
56
USB/LSB Test Frequencies and Functions
57
VCO Checks and Adjustments
58
VCO1 Check
58
VCO2 Check
58
VCO2 Adjust
59
45 Mhz Filter Alignment
59
Alignment - Method 1
60
Alignment - Method 2
61
455 Khz if and N/L Alignment
61
Frequency Adjustment
62
Frequency Adjust USB
62
Frequency Adjust LSB
63
Mute Adjustment
63
PA Adjustments
64
Driver Bias
64
PA Bias
64
Output Power
65
Intermodulation
66
Receiver Performance Checks
67
Sensitivity and S+N/N Ratio
67
AGC Check
67
Audio Output
67
Selectivity (USB Operation)
67
Clarifier Operation
68
Noise Limiter Operation
68
Transmitter Performance Checks
68
Frequency Check
68
Alc
69
Power Output and Intermodulation
69
Emergency Call
69
8 Appendices
71
Appendix A: Connectors
71
Microphone
71
External Loudspeaker
71
Antenna Control
72
Programming Cable
72
Cloning Cable
72
A.3 Antenna Control
72
Appendix B: Parts Lists
73
General Information
73
Ordering Information
74
Component Substitution
74
Parts Lists
74
B.2 Ordering Information
74
Appendix C: Engineering Drawings
75
Appendix D: Glossary of Terms
77
Abbreviations
77
D.2 Abbreviations of Units
78
D.3 Abbreviations of Unit Multiples
79
4
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Codan X-2 Specifications
General
Brand
Codan
Model
X-2
Category
Transceiver
Language
English
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