SEA 222 User Manual

SEA 222 OPERATOR'S MANUAL
Featuring a unique "softouch" keypad, the SEA 222 is as easy to operate as a
microwave oven. Just follow the directions in this booklet.
The "brain" of the SEA 222 is divided into two parts:
1. 290 factory programmed frequency pairs selectable by channel number
from EPROM memory.
2. 100 channels of "scratch pad" memory for front panel programming and
recall (Note: 10 of these channels are "EMERGENCY" channels).
When operating your
SEA 222 please note:
1. Any two-digit key stroke followed by "enter" will recall user-programmed
channels 10-99;
2. Any 3 and 4-digit key stroke followed by "enter" recalls factory -pro-
grammed
channels.
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A UNIT OF DATAMARINE INTERNATIONAL, INC.
I

SEA 222 Specifications

General

Brand	SEA
Model	222
Category	Radio
Language	English

Summary

Front Panel Controls and Operation

Keypad Functions and Basic Operations

Covers SQL, EMER keys, initialization, dimming, and audio feedback.

Channel and Memory Management

Selecting and Programming Channels

Details selecting factory channels and scratch pad memory operations.

Transmitter and Programming

Transmitter Operation and Mode Selection

Covers transmitter basics, frequency/mode selection.

Programming the SEA 222

Details bandwidth limitations and scratchpad programming.

Theory of Operation

Receiver Design Overview

Covers general receiver design, block diagram, RF circuitry, and mode selection.

Transmitter Circuitry

Microphone, Speech, and Modulation Stages

Covers microphone input, speech processing, and modulation.

IF Stages, Mixers, and Amplifiers

Details IF amplifiers, mixers, and frequency conversion stages.

Oscillator Systems

Phase Locked Oscillator System