Datamarine SEA 222 Manuals

Manuals and User Guides for Datamarine SEA 222. We have 1 Datamarine SEA 222 manual available for free PDF download: Instruction And Maintenance Manual

Datamarine SEA 222 Instruction And Maintenance Manual (160 pages)

HF Single Sideband Radiotelephone

Brand: Datamarine | Category: Cordless Telephone | Size: 8.4 MB

Table of Contents
3
List of Illustrations
5
Wiring Diagram
6
General Information
7
Description
7
Electrical Specifications
8
General
8
Operation
10
Warm-Up Caution
10
Front Panel Controls and Indicators
10
Propagation
13
Description of Memory Functions
13
Dimming the Display
13
Turning the Audio Feedback Off/On
14
To Enter Scan Mode
14
Selecting a Frequency from Scrathpad Memory
14
Selecting a Channel by Number
14
Simplex Frequency Direct Entry
15
Selecting an Emergency Channel
15
Activating the Squelch Function
15
Activating the Tuned Indicator
15
Operating the Transmitter
16
Operating Optional Features
16
Interconnection Diagram
17
Cw
17
Programming
18
Frequency and Mode Selection
18
Bandwidth Limitations
18
Entering the Program Mode
19
Entering Scratchpad Frequency and Mode Data
19
To Reprogram a Channel
20
To Erase Channel Frequencies
20
Adjusting the Squelch Threshold
20
Exiting the Program Mode
21
Sea 222 Frequency Program
22
Frequency Tolerance
30
Setting the Transmitter Frequencies
30
The Master Clock Oscillator
30
Installation
32
Mounting the Transceiver
32
A Typical Installation
32
Fusing
37
The Ground Connection
37
Theory of Operation
38
The Receiver
38
Block Diagram
38
Receiver Block Diagram
39
Receive RF Circuitry and First Mixer
41
Second Mixer and 6.4 Mhz SSB Filter
41
Bi-Lateral I.F. Amplifier
42
Low-Noise Audio Preamplifier
43
Audio Preamplifier/Filter
43
Audio Power Amplifier
44
Squelch Limiter/Amplifier
44
The Audio-Derived AGC System
44
The Audio T/R Gates
45
The Transmitter
45
Transmit Block Diagram
46
Microphone Preamplifier
47
Speech Limiter
47
Speech Amplifier/Low-Pass Filter Buffer
48
Transmitter Balanced Modulator
48
Carrier Reinsertion Amplifier
48
Signal Mixer and Low-Pass Filter
49
Transmitter Signal Preamplifier
50
Transmitter Predriver
50
Transmitter Power Amplifier
51
Output Low Pass Filter
52
ALC Circuit
52
Transmitter Driver
54
Transmitter Power and Amplifier
54
The Phase-Locked Local Oscillator System
56
PLL Block Diagram
58
The Reference Clock Oscillator
59
Low Speed Loop Reference
59
CPU Clock Divider
60
The High-Frequency Divide by N Counter
60
High Frequency Phase Detector/Loop Filter
60
The VCO System and Associated Buffers
61
The VCXO and Associate Buffers
61
Secondary Loop
62
Mode and Frequency Control
63
Transmitter Mode Selection
63
Receive Mode Selection
64
The Power Supply Circuit
65
Simplified Diagram of Power Supply Circuitry
66
VF Display/Display Driver -25 Volt Supply
68
VF Display Filament Oscillator
68
Options
69
C/W Hold Module Installation
69
Low Level Audio Connection
73
Auto Alarm Option
73
Adjusting the Alarm Generator
76
Alarm Initiation System
77
Bandpass Filters
77
Sidetone Amplifier
78
The PTT Circuitry
78
Wiring Harness Specifications
81
Test Points
82
Main Board D.C. Measurements
82
Transmitter Signal Levels
82

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Datamarine SEA 222 Manuals

Datamarine SEA 222 Instruction And Maintenance Manual (160 pages)

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