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Manuals
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Datamarine Manuals
Cordless Telephone
SEA 222
Instruction and maintenance manual
Datamarine SEA 222 Instruction And Maintenance Manual
Hf single sideband radiotelephone
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Table Of Contents
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
List of Illustrations
Wiring Diagram
General Information
Description
Electrical Specifications
General
Operation
Warm-Up Caution
Front Panel Controls and Indicators
Propagation
Description of Memory Functions
Dimming the Display
Turning the Audio Feedback Off/On
To Enter Scan Mode
Selecting a Frequency from Scrathpad Memory
Selecting a Channel by Number
Simplex Frequency Direct Entry
Selecting an Emergency Channel
Activating the Squelch Function
Activating the Tuned Indicator
Operating the Transmitter
Operating Optional Features
Interconnection Diagram
Cw
Programming
Frequency and Mode Selection
Bandwidth Limitations
Entering the Program Mode
Entering Scratchpad Frequency and Mode Data
To Reprogram a Channel
To Erase Channel Frequencies
Adjusting the Squelch Threshold
Exiting the Program Mode
Sea 222 Frequency Program
Frequency Tolerance
Setting the Transmitter Frequencies
The Master Clock Oscillator
Installation
Mounting the Transceiver
A Typical Installation
Fusing
The Ground Connection
Theory of Operation
The Receiver
Block Diagram
Receiver Block Diagram
Receive RF Circuitry and First Mixer
Second Mixer and 6.4 Mhz SSB Filter
Bi-Lateral I.F. Amplifier
Low-Noise Audio Preamplifier
Audio Preamplifier/Filter
Audio Power Amplifier
Squelch Limiter/Amplifier
The Audio-Derived AGC System
The Audio T/R Gates
The Transmitter
Transmit Block Diagram
Microphone Preamplifier
Speech Limiter
Speech Amplifier/Low-Pass Filter Buffer
Transmitter Balanced Modulator
Carrier Reinsertion Amplifier
Signal Mixer and Low-Pass Filter
Transmitter Signal Preamplifier
Transmitter Predriver
Transmitter Power Amplifier
Output Low Pass Filter
ALC Circuit
Transmitter Driver
Transmitter Power and Amplifier
The Phase-Locked Local Oscillator System
PLL Block Diagram
The Reference Clock Oscillator
Low Speed Loop Reference
CPU Clock Divider
The High-Frequency Divide by N Counter
High Frequency Phase Detector/Loop Filter
The VCO System and Associated Buffers
The VCXO and Associate Buffers
Secondary Loop
Mode and Frequency Control
Transmitter Mode Selection
Receive Mode Selection
The Power Supply Circuit
Simplified Diagram of Power Supply Circuitry
VF Display/Display Driver -25 Volt Supply
VF Display Filament Oscillator
Options
C/W Hold Module Installation
Low Level Audio Connection
Auto Alarm Option
Adjusting the Alarm Generator
Alarm Initiation System
Bandpass Filters
Sidetone Amplifier
The PTT Circuitry
Wiring Harness Specifications
Test Points
Main Board D.C. Measurements
Transmitter Signal Levels
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