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Icom ic-m423g - User Manual

Icom ic-m423g
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INSTRUCTION MANUAL
VHF MARINE TRANSCEIVER
This device complies with Part 15 of the FCC
Rules. Operation is subject to the condition that
this device does not cause harmful interference.
iM423
iM423G
iM424
iM424G
IC-M423G

Table of Contents

Questions and Answers:

Icom ic-m423g Specifications

General IconGeneral
TypeMarine VHF Transceiver
Frequency Range (Receive)156.000 - 163.425 MHz
Output Power25W / 1W
Waterproof RatingIPX7
NMEA ConnectivityNMEA 0183
DSCYes
Current Consumption (Receive)0.5 A
Operating Temperature Range-15°C to +55°C
DisplayLCD
GPSYes
ModulationFM
Frequency Range (Transmit)156.025–157.425 MHz
Power Supply13.8 V DC

Summary

Foreword and Important Information

Product Features Overview

Lists key features of the VHF marine transceiver, including DSC and GPS capabilities.

Essential Pre-Use Instructions

Advises reading all instructions and saving the manual for future reference.

Definition of Warning Terms

Defines terms like WARNING, CAUTION, and NOTE to indicate potential risks.

Emergency Procedures and Country Codes

Distress Call Procedure (Channel 16)

Step-by-step guide for making a distress call using Channel 16.

Distress Call Procedure (Digital Selective Calling)

Steps for initiating a distress call using Digital Selective Calling on Channel 70.

International Country Code List

A list of country codes as defined by ISO 3166-1.

Radio Operator Safety Guidelines

RF Exposure Limits and MPE Radius

Explains RF exposure limits, MPE radius, and safe installation distances.

FCC Compliance Information

Class A Digital Device Compliance

FCC statement regarding compliance for Class A unintentional radiators.

Warning Sticker Placement

Note regarding the placement of the FCC warning sticker.

General Precautions and Warnings

Critical Safety and Usage Precautions

Covers electrical safety, placement, environmental limits, and cleaning.

Operating Rules and Licenses

Call Priorities & Privacy Guidelines

Guidelines on call priority, information privacy, and channel monitoring.

Radio Licensing Requirements

Details requirements for obtaining and maintaining radio station and operator licenses.

Panel Description

Main Unit Panel Overview

Describes the front panel controls, function display, indicators, and softkey functions.

Speaker Microphone Controls

Details the controls and functions of the supplied speaker microphone.

Preparation and Initial Setup

Entering the MMSI Identity Code

Step-by-step guide for entering the Maritime Mobile Service Identity (MMSI) code.

Entering the ATIS Identification Code

Procedure for entering the ATIS code for specific regional versions.

Basic Transceiver Operation

Channel Selection and Usage

How to select and use regular, weather, and call channels.

Receiving and Transmitting Signals

Procedures for receiving audio and transmitting voice communications.

Adjusting Volume and Squelch Levels

Guide to setting the audio volume and squelch levels for clear reception.

Key Lock and Backlight Adjustment

How to use the microphone lock and adjust screen backlight.

AquaQuake Water Draining Function

Instructions for using the AquaQuake feature to clear water from the speaker grill.

Scan Operation Modes

Understanding Scan Types

Explanation of Priority and Normal scanning modes.

Managing Favorite Channels for Scanning

How to add or remove channels from the scan list.

Initiating and Stopping Scans

Procedures for starting, resuming, and stopping scan operations.

Dualwatch and Tri-watch Functions

Dualwatch;Tri-watch Description

Explanation of how Dualwatch and Tri-watch monitor channels.

Operating Dualwatch and Tri-watch

Steps to activate and use the Dualwatch and Tri-watch monitoring features.

Digital Selective Calling (DSC) Operations

Managing DSC Address IDs

Entering, editing, and deleting individual and group DSC IDs.

Entering Position and Time Data

Manual input of ship's position and UTC time for DSC calls.

Making Distress Calls

Detailed procedure for transmitting a DSC distress alert.

Making Other DSC Calls

Procedures for individual, group, all ships, position, polling, and test calls.

Receiving and Responding to DSC Calls

Handling incoming distress, individual, group, and position calls.

DSC Settings Configuration

Customizing auto-acknowledgement, channel switching, alarms, and squelch.

Additional Transceiver Functions

Using the Intercom Feature

How to use the intercom function with the COMMANDMIC accessory.

PA and Horn Functionality

Instructions for operating the Public Address system and sounding the horn.

Menu Screen Navigation and Settings

Navigating the Menu System

Guide to accessing and operating the transceiver's menu interface.

Overview of Menu Item Categories

Lists available menu sections: DSC Calls, DSC Settings, Radio Settings, Configuration, MMSI/GPS.

Radio Settings Customization

Configuring scan types, resume timers, channel groups, and weather alerts.

General Configuration Options

Adjusting backlight, contrast, key beep, key assignment, UTC offset, noise cancel, inactivity timers.

NMEA Output and Remote ID Setup

Configuring NMEA data output and setting the Remote ID number.

Connections and Maintenance Guide

External System Connections

Diagrams and descriptions for connecting antennas, GPS, speakers, and power.

AIS Transponder Integration

Steps for connecting the MA-500TR AIS transponder for DSC calls.

Routine Maintenance Procedures

Covers fuse replacement, cleaning, and antenna considerations.

Installation Procedures

Instructions for mounting the transceiver and installing the microphone.

Specifications and Optional Equipment

Technical Performance Specifications

Detailed electrical, performance, and physical specifications of the transceiver.

Available Optional Accessories

List and description of optional accessories like flush mount kits and microphones.

Channel Frequency List

VHF Marine Channel Allocation

List of VHF marine channels, frequencies, and usage notes for different regions.

Troubleshooting Guide

Common Problems and Solutions

Table of common issues, their possible causes, and recommended solutions.

Mounting Template

Cutout Template for Installation

A printable template for cutting holes for flush mounting accessories.

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