INSTRUCTION MANUAL VHF MARINE TRANSCEIVER iM423 iM423G iM424 iM424G This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference.
PREFACE IMPORTANT Thank you for choosing this Icom product. This product is designed and built with Icom’s state of the art technology and craftsmanship. With proper care, this product should provide you with years of trouble-free operation.
IN CASE OF EMERGENCY INSTALLATION NOTE If your vessel requires assistance, contact other vessels and the Coast Guard by sending a Distress call on Channel 16. Installation: The installation of this equipment should be made in such a manner as to respect the EC recommended electromagnetic field exposure limits. (1999/519/EC) USING CHANNEL 16 DISTRESS CALL PROCEDURE 1. “MAYDAY MAYDAY MAYDAY.” 2. “THIS IS ...............” (name of vessel). 3.
RADIO OPERATOR WARNING Icom requires the radio operator to meet the FCC Requirements for Radio Frequency Exposure. An omnidirectional antenna with gain not greater than 9 dBi must be mounted a miniW ARN ING mum of 5 meters (measured from the lowest point of the antenna) vertically above the main deck and all possible personnel. This is the minimum safe separation distance estimated to meet all RF exposure compliance requirements.
AVERTISSEMENT POUR LES OPÉRATEURS RADIO Icom exige que l'opérateur radio se conforme aux exigences de la FCC en matière d'exposition aux radiofréquences. Une antenne omnidirectionnelle dont le gain ne dépasse pas 9dBi doit être fixée à une distance minimale de 5 mètres (mesurée AVERTISSEMENT depuis le point le plus bas de l'antenne) verticalement au-dessus du pont principal et de tout le personnel qui peut s'y trouver.
FCC INFORMATION NOTE • FOR CLASS A UNINTENTIONAL RADIATORS: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
PRECAUTIONS RWARNING! NEVER connect the transceiver to an AC outlet. This may pose a fire hazard or result in an electric shock. RWARNING! NEVER connect the transceiver to a power source of more than 16 V DC such as a 24 V DC. This could cause a fire or damage the transceiver. RWARNING! NEVER reverse the DC power cable polarity when connecting to a power source. This could damage the transceiver. RWARNING! NEVER cut the DC power cable between the DC plug at the back of the transceiver and fuse holder.
PRÉCAUTIONS RAVERTISSEMENT! NE JAMAIS connecter l’emetteur- MAINTENIR l'émetteur-récepteur et le microphone à au recepteur a une alimentation CA au risque de provoquer un incendie ou un choc electrique. moins 1 mètre du compas de route magnétique du navire. RAVERTISSEMENT! NE JAMAIS brancher l'émetteurrécepteur à une source d'alimentation de plus de 16 V CC, comme une source de 24 V CC. Cela pourrait causer un incendie ou endommager l'émetteur-récepteur.
TABLE OF CONTENTS PREFACE............................................................................... i IMPORTANT........................................................................... i EXPLICIT DEFINITIONS........................................................ i IN CASE OF EMERGENCY.................................................. ii INSTALLATION NOTE........................................................... ii RADIO OPERATOR WARNING...........................................
TABLE OF CONTENTS (continued) 7 DSC OPERATION....................................................22–70 ■■ DSC address ID .........................................................22 ■■ Entering position and time..........................................25 ■■ Making a Distress call.................................................26 ■■ Making DSC calls........................................................32 ■■ Receiving DSC calls...................................................55 ■■ Transmitted Call log...
OPERATING RULES DDPriorities • Read all rules and regulations pertaining to call priorities, and keep an up-to-date copy handy. Safety and distress calls take priority over all others. • You must monitor Channel 16 when you are not operating on another channel. • False or fraudulent distress calls are prohibited under law.
2 PANEL DESCRIPTION ■■Front panel Speaker q Function display (p. 5) w e r t y u o i q DISTRESS KEY [DISTRESS] (pp. 26, 27) Hold down for 3 seconds to make a Distress call. w ENTER KEY [ENT] (pp. 9, 12, 74) Push to set the entered data, selected item, and so on. e LEFT AND RIGHT KEYS [Ω]/[≈] ➥➥ Push to change to the previous or next key function that is assigned to the softkeys. (p.
PANEL DESCRIPTION i CHANNEL 16/CALL CHANNEL KEY [16/C] ➥➥ Push to select Channel 16. (p. 11) ➥➥ Hold down for 1 second to select the Call channel. (p. 11) • “CALL” is displayed when the Call channel is selected. ➥➥ When the Call channel is selected, hold down for 3 seconds to enter Call channel entry mode. (p. 16) o SOFTKEYS Desired functions as described below can be assigned in the Menu screen. Distress Call [ ] (For only USA version transceivers.
2 PANEL DESCRIPTION ■ Front panel (Continued) Speaker q Function display (p. 5) w Backlight [ ] (p. 18) Push to enter the LCD and key backlight brightness adjustment mode. e • While in the adjustment mode, push [∫]/[√]/[Ω]/[≈] or rotate Dial to adjust the brightness of the LCD and key backlight. r t y u o i Favorite channel [ ] (p. 20) ➥➥ Push to set or clear the displayed channel as a Favorite (Tag) channel.
PANEL DESCRIPTION 2 ■■Function display q w e r t y u i o !0 !9 !8 !7 !6 !5 !1 !2 !3 !4 q BUSY/TRANSMIT ICON (p. 14) ➥➥ “ ” is displayed when receiving a signal or when the squelch is open. ➥➥ “ ” is displayed while transmitting. w POWER ICON (p. 14) ➥➥ “25W” is displayed when high power is selected. ➥➥ “1W” is displayed when low power is selected. e RX SPEAKER ICON (p. 72) Displayed while in the RX Speaker mode. r CHANNEL GROUP ICON (p.
2 PANEL DESCRIPTION ■ Function display (Continued) q !5 KEY ICON (p. 7) Shows the preset function of the softkeys on the front panel. w e r t y u i o !0 !9 !8 !7 !6 !5 !1 !2 !3 !4 !1 RT (Radio Telephone) ICON (For only USA version transceivers.) Displayed while receiving or transmitting a signal, and when the channel is changed. • The icon is displayed if the “RT Indicator:” item in the RADIO SET menu is set to “ON.
PANEL DESCRIPTION 2 ■■Softkey function !7 POSITION INDICATOR ➥➥ Shows the current position when position data is received, or the position is manually entered. • When the GPS position is invalid, “??” may blink every 2 seconds instead of position. The last position is held for only 23.5 hours, and after that, “NO POSITION” is displayed. • “ ??” will blink every 2 seconds instead of position, after 4 hours* have passed from the time when the position is manually entered.
2 PANEL DESCRIPTION ■■Speaker Microphone e TRANSMIT POWER KEY [H/L]* ➥➥ Push to toggle the power high or low. (p. 14) • Some channels are set to only low power. ➥➥ While holding down [H/L], turn ON the power to turn the Microphone Lock function ON or OFF. (p. 17) r CHANNEL 16/CALL CHANNEL KEY [16/C] ➥ Push to select Channel 16. (p. 11) ➥ Hold down for 1 second to select the Call channel. (p.
PREPARATION 3 ■■Entering the MMSI code The 9 digit MMSI (Maritime Mobile Service Identity: DSC self ID) code can be entered at power ON. This initial code setting can be made only once. After being set, it can be changed by only your dealer or distributor. If your MMSI code has already been entered, the following steps are not necessary. rrRepeat step e to enter all 9 digits. tt After entering the 9 digit code, “FINISH” is automatically selected, and then push [ENT] or Dial to set it.
3 PREPARATION ■■Entering the ATIS code (For Dutch and German version transceivers) The 10 digit ATIS (Automatic Transmitter Identification System) code can be entered at power ON. This initial code setting can be made only once. After being set, it can be changed by only your dealer or distributor. If your ATIS code has already been entered, the following steps are not necessary. qq After entered the MMSI code, “Push [ENT] to Register Your ATIS” is displayed. wwPush [ENT] to start entering the ATIS code.
BASIC OPERATION 4 ■■Selecting a Channel DDChannel 16 DDCall channel Channel 16 is the distress and safety channel. It is used for establishing initial contact with a station and for emergency communications. Channel 16 is monitored during both Dualwatch and Tri-watch. While standing by, you must monitor Channel 16. Each regular channel group has a separate leisure use Call channel. The Call channel is monitored during Tri-watch. The Call channel data can be entered.
4 BASIC OPERATION ■ Selecting a Channel (Continued) DDSelecting the Channel group There are preset international channels in the IC-M423/ICM423G/IC-M424/IC-M424G. Except for the European versions, you can select a channel group suitable for your operating area, as described below. qqPush [MENU]. ww Rotate Dial or push [∫]/[√] to select “Radio Settings,” and then push [ENT]. ee Rotate Dial or push [∫]/[√] to select “CHAN Group,” and then push [ENT].
BASIC OPERATION DDSelecting a Weather channel (For only USA and Australian version transceivers) The transceiver has 10 weather channels. These are used for monitoring broadcasts from NOAA. (National Oceanographic and Atmospheric Administration) The transceiver can automatically detect a weather alert tone on the selected weather channel, or while scanning. (p. 19) qq Push [CH/WX] once or twice to select a weather channel. • “WX” is displayed when a weather channel is selected.
4 BASIC OPERATION ■■Receiving and transmitting CAUTION: Transmitting without an antenna will damage the transceiver. qqHold down [PWR](Dial) to turn ON the power. ww Set the audio and squelch levels. (p. 15) ➥➥ First, open the squelch. Then, adjust the audio output level. After that, adjust the squelch level until the noise just disappears. ee Change the channel group. (p. 12) rr Push [∫]/[√] to select a channel. (pp. 11, 12) • Pushing [Y]/[Z] on the microphone selects only Favorite channels.
BASIC OPERATION 4 ■■ Adjusting the volume and squelch levels r The volume and squelch levels can be adjusted with [VOL/ SQL](Dial). qq Push [VOL/SQL](Dial) one or more times to display the volume or squelch adjustment screen. ww Rotate [VOL/SQL](Dial) or push [∫]/[√]/[Ω]/[≈] to adjust the volume or squelch level. t ui Microphone y ui wq Microphone • The transceiver has 20 volume levels and OFF. • The transceiver has 11 squelch levels.
4 BASIC OPERATION ■■Entering a Call channel data ■■Entering a Channel name You can enter data in Call channel in each channel group for quick recall. Enter a name of up to 10 characters. Capital letters, 0 to 9, some symbols, (! " # $ % & ' ( ) * + , – . / [ \ ] ^ _ : ; < = > ?) and a space can be entered. qq Select the desired channel group (INT, USA, CAN, ATIS, or DSC) to be entered. (p. 12) ww Hold down [16/C] for 1 second to select the Call channel of the selected channel group.
BASIC OPERATION 4 ■■Microphone Lock function rrRepeat step e to enter all characters. The Microphone Lock function electrically locks [∫], [√], [16/C],*1 and the [H/L]*2 keys on the supplied microphone. This prevents accidental channel changes and function access. *1For only IC-M423G and IC-M424G. *2 [HI/LO] is printed for the IC-M423 and IC-M424. tt Push [Ω]/[≈]/[∫]/[√] to select “FINISH,” then push [ENT] to set the name and return to the previous screen.
4 BASIC OPERATION ■■ Adjusting the Backlight level The function display and keys can be backlit for better visibility under low light conditions. The backlight is adjustable in 7 levels and OFF. The adjustment method, described below differs depending on the presetting. ➥➥ Push [BKLT] to show the backlight adjustment screen. Rotate Dial or push [∫]/[√]/[Ω]/[≈] to adjust the brightness of the LCD and key backlight, and then, push [ENT].
SCAN OPERATION 5 ■■Scan types Scanning is an efficient way to locate signals quickly over a wide frequency range. The transceiver has a Priority scan and a Normal scan. When the Weather Alert function* is ON, the weather channel is also checked while scanning. (p. 77) Set the Favorite channels (scanned channel) before scanning. Clear the Favorite channels which inconveniently stop scanning, such as those for digital communication use. (Refer to the next page for details.
5 SCAN OPERATION ■■Setting Favorite channels ■■Starting a scan For more efficient scanning, add desired channels as Favorite channels, or clear the Favorite on unwanted channels. Channels that are not tagged will be skipped while scanning. Favorite channels can be independently assigned to each channel group (INT, USA, CAN, ATIS, or DSC). First, set the scan type (Priority or Normal scan) and scan resume timer in the Menu screen. (p. 76) qqSelect the desired channel group. (p.
DUALWATCH/TRI-WATCH 6 ■■Description ■■Operation Dualwatch monitors Channel 16 while you are receiving on another channel; Tri-watch monitors Channel 16 and the Call channel while receiving another channel. Dualwatch and Tri-watch are convenient for monitoring Channel 16 when you are operating on another channel. qqSelect Dualwatch or Tri-watch in the Menu screen. (p. 76) ww Push [Y]/[Z] to select the desired operating channel. ee Push [DW] to start a Dualwatch or Tri-watch scan.
7 DSC OPERATION ■■DSC address ID DDEntering an Individual ID A total of 100 DSC address IDs can be entered and assigned a name of up to 10 characters. ttAfter entering the 9 digit code, push [ENT] or Dial to set it. •The ID name entry screen is displayed. qqEnter “INDIVIDUAL ID” in the DSC SETTINGS menu. MENU ➪ DSC Settings ➪ Individual ID (Rotate Dial, then push [ENT].) (Push [MENU].) wwPush [ADD]. • The “INDIVIDUAL ID” entry screen is displayed.
DSC OPERATION DDEntering a Group ID qqEnter “GROUP ID” in the DSC SETTINGS menu. MENU ➪ DSC Settings ➪ Group ID (Push [MENU].) (Rotate Dial, then push [ENT].) 7 tt After entering the 9 digit code, push [ENT] or Dial to set it. • Group ID name entry screen is displayed. wwPush [ADD]. • The “GROUP ID” entry screen is displayed. yy Enter a desired 10 digit ID name in the following way: eeEnter a desired group ID in the following way: • Select a desired number using Dial, or [Y]/[Z]/[Ω]/[≈].
7 DSC OPERATION ■ DSC address ID (Continued) DDDeleting Individual and Group IDs qq Enter “INDIVIDUAL ID” or “GROUP ID” in the DSC SETTINGS menu. MENU ➪ DSC Settings ➪ Individual ID/Group ID (Push [MENU].) (Rotate Dial, then push [ENT].) ee Push [OK] to delete the ID, and return to the “INDIVIDUAL ID” or “GROUP ID” list screen. • Push [CANCEL] to cancel it. • When no address ID is entered, “No ID” is displayed. In this case, push [MENU] to exit the MENU screen.
DSC OPERATION 7 ■■Entering position and time A Distress call should include the ship’s position and time. If no GPS receiver is connected and built-in GPS receiver* is not receiving valid position data, your position and UTC (Universal Time Coordinated) time should be manually entered. They are automatically included when a GPS receiver compatible with the NMEA 0183 (ver. 2.0 or later) format is connected. • Push [EXIT] to return to the normal operating mode.
7 DSC OPERATION ■■Making a Distress call A Distress call should be made if, in the opinion of the Master, that the ship or a person is in distress and requires immediate assistance. NEVER MAKE A DISTRESS CALL IF YOUR SHIP OR A PERSON IS NOT IN AN EMERGENCY. A DISTRESS CALL SHOULD BE MADE ONLY WHEN IMMEDIATE HELP IS NEEDED. DDSimple call ww After transmitting the call, the transceiver waits for an acknowledgment call. • The Distress call is automatically transmitted every 3.5 to 4.
DSC OPERATION 7 DDMaking a Regular call The nature of the Distress call should be included in the Distress call. eeThe Distress call confirmation screen is displayed. • Rotate Dial or push [Y]/[Z] to see the hidden lines. qqEnter “DISTRESS CALL” in the DSC CALLS menu.* MENU ➪ DSC Calls ➪ Distress Call (Push [MENU].) (Rotate Dial, then push [ENT].) * Only USA version, you can enter “DISTRESS CALL” by pushing [DTRS].
7 DSC OPERATION ■ Making a Distress call (Continued) tt After transmitting the call, the transceiver waits for an acknowledgment call. • The Distress call is automatically transmitted every 3.5 to 4.5 minutes, until an acknowledgement is received (‘Call repeat’ mode), or DSC cancel call is made. (p. 29) • Push [RESEND] to manually transmit the Distress repeat call. • Push [Ω]/[≈] then push [INFO] to display the transmitted Distress call information.
DSC OPERATION DDCanceling a Distress call qq While waiting for an acknowledgment call, push [CANCEL]. 7 rrThe Distress cancel call is transmitted. ttChannel 16 is automatically selected. wwPush [CONTINUE]. • Push [BACK] to return to waiting for an acknowledgement call. • Report your situation using the microphone. • After the report, push [EXIT] to return to the normal operating mode.* • Only USA version, push [RESEND] to resend the call. eePush [FINISH].
7 DSC OPERATION DDMaking a Distress Relay Acknowledgement (For only USA version transceivers) When receiving a Distress Relay Call, you can transmit an acknowledgement, as shown below. q When a Distress Relay Call is received, alarm sounds and the screen shown below is displayed. Push [ALARM OFF] to stop the alarm. About Received call information: • Push [IGN] to ignore the call and return to the normal operating mode. • Push [BACK] to return to the previous screen.
DSC OPERATION rr The Distress Relay Acknowledgement confirmation screen is displayed. Push [CALL] to transmit the acknowledgement call. • Push [EXIT] to return to the normal operating mode.* *The exit confirmation dialog (p. 27) is displayed. • Push [BACK] to return to the previous screen. tt The Distress Relay Acknowledgement is transmitted. y Channel 16 is automatically selected. • Push [EXIT] to return to the normal operating mode.* *The exit confirmation dialog (p. 27) is displayed.
7 DSC OPERATION ■■Making DSC calls About Manual Entry: Enter a desired individual ID in the following way: To ensure correct operation of the DSC function, make sure you correctly set the CH70 SQL LEVEL. (p. 67) • Select a desired number using Dial, or [Ω]/[≈]. • Push [ENT] or Dial to set it. • To move the cursor, select either arrow, “←” or “→,” then push [ENT] or Dial. • The first digit is specified as ‘0’ for a Group ID.
DSC OPERATION ee Select a desired intership channel using Dial or [Y]/[Z], then push [ENT]. • Intership channels are already preset into the transceiver in the recommended order. 7 yy Standby on Channel 70 until an acknowledgement is received. • Push [EXIT] to return to the normal operating mode.* * Only USA version, the exit confirmation dialog (p. 29) is displayed. • Only USA version, push [RESEND] to resend the call. Displayed for only USA version. rrA confirmation screen is displayed.
7 DSC OPERATION ■ Making DSC calls DD Making an Individual call (continued) Or, when the acknowledgement ‘Unable to comply’ is received, alarm sounds and the screen below is displayed. Push [ALARM OFF] to stop the alarm. Then push [EXIT] to return to the operating channel (before you entered the MENU screen).
DSC OPERATION eeSelect one of three options, then push [ENT]. • Push [EXIT] to return to the normal operating mode. • Push [BACK] to return to the previous screen. • Able to Comply: Make an acknowledgment call without any changes. • Unable to Comply: You cannot make a communication. The Acknowledgement call (‘Unable to Comply’) can be automatically transmitted, if set. See page 65 for details. • Propose New Channel: You can make an acknowledgement call, but you specify the intership channel.
7 DSC OPERATION ■ Making DSC calls DD Making an Individual Acknowledgement (continued) Manual ACK: qqEnter “INDIVIDUAL ACK” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Individual ACK (Push [MENU].) (Rotate Dial, then push [ENT].) • When no Individual call has been received, the Individual ACK item will not be displayed. DDMaking a Group call The Group call function allows you to make a DSC signal to only a specific group. qqEnter “GROUP CALL” in the DSC CALLS menu.
DSC OPERATION ee Select a desired intership channel using Dial or [Y]/[Z], then push [ENT]. 7 rrA confirmation screen is displayed. • Confirm the call contents. • Intership channels are already preset into the transceiver in the recommended order. ttPush [CALL] to make a Group call. • If Channel 70 is busy, the transceiver stands by until the channel becomes clear. About Manual Entry: Enter a desired group ID in the following way: • Select a desired number using Dial, or [Ω]/[≈].
7 DSC OPERATION ■ Making DSC calls (Continued) DDMaking an All Ships call rrA confirmation screen is displayed. • Confirm the call contents. All ships that have DSC transceiver use Channel 70 as their ‘listening channel.’ When you want to announce a message to these ships, use the ‘All Ships Call’ function. qqEnter “ALL SHIPS CALL” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ All Ships Call (Rotate Dial, then push [ENT].) (Push [MENU].) ttPush [CALL] to make an All Ships call.
DSC OPERATION DDMaking a Position Request Call (For only USA and Australian version transceivers) Make a Position Request Call when you want to know a specific ship’s current position, and so on. qqEnter “POSITION REQUEST” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Position Request (Push [MENU].) (Rotate Dial, then push [ENT].) About Manual Entry: Enter a desired individual ID in the following way: • Select a desired number using Dial, or [Y]/[Z]/[Ω]/[≈]. • Push [ENT] or Dial to set it.
7 DSC OPERATION ■ Making DSC calls DD Making a Position Request call (continued) rrPush [CALL] to make a Position Request Call. • If Channel 70 is busy, the transceiver stands by until the channel becomes clear. tt After the Position Request Call has been transmitted, the following screen is displayed. • Push [EXIT] to return to the normal operating mode.* * Only USA version, the exit confirmation dialog (p. 29) is displayed. • Only USA version, push [RESEND] to resend the call.
DSC OPERATION 7 DDMaking a Position Report Call (For only USA and Australian version transceivers) Make a Position Report Call when you want to announce your own position to a specific ship and receive an answer back. qqEnter “POSITION REPORT” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Position Report (Rotate Dial, then push [ENT].) (Push [MENU].) ww Select a desired preset individual address, or “Manual Input,” using Dial or [Y]/[Z], then push Dial or [ENT].
7 DSC OPERATION ■ Making DSC calls DD Making a Position Report call (continued) rrPush [CALL] to make a Position Report Call. • If Channel 70 is busy, the transceiver stands by until the channel becomes clear. When no GPS receiver is connected and built-in GPS receiver* is not receiving valid position data, and both position and time have been manually entered, the screen as shown below is displayed. Edit your latitude and longitude position and UTC time as follows: *For only IC-M423G and IC-M424G.
DSC OPERATION 7 DDMaking a Polling Request Call (For only USA and Australian version transceivers) Make a Polling Request Call when you want to know a specific vessel is in the communication area, or not. qqEnter “POLLING REQUEST” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Polling Request (Push [MENU].) (Rotate Dial, then push [ENT].) ww Select a desired preset individual address, or “Manual Input,” using Dial or [Y]/[Z], then push Dial or [ENT].
7 DSC OPERATION ■ Making DSC calls DD Making a Polling Request call (continued) rrPush [CALL] to make a Polling Request Call. • If Channel 70 is busy, the transceiver stands by until the channel becomes clear. tt After the Polling Request Call has been transmitted, the following screen is displayed. • Push [EXIT] to return to the normal operating mode.* * Only USA version, the exit confirmation dialog (p. 29) is displayed. • Only USA version, push [RESEND] to resend the call.
DSC OPERATION DDMaking a Test call Testing on the exclusive DSC distress and safety calling channels should be avoided as much as possible. When testing on a distress or safety channel is unavoidable, you should indicate that these are test transmissions. Normally the test call would require no further communications between the two stations involved. qqEnter “TEST CALL” in the DSC CALLS menu.
7 DSC OPERATION ■ Making DSC calls DD Making a Test call (continued) rrPush [CALL] to make a Test call. • If Channel 70 is busy, the transceiver stands by until the channel becomes clear. tt After the Test call has been transmitted, the following screen is displayed.* • Push [EXIT] to return to the normal operating mode.* * Only USA version, the exit confirmation dialog (p. 29) is displayed. • Only USA version, push [RESEND] to resend the call. Displayed for only USA version.
DSC OPERATION DDMaking a Test Acknowledgement call When the “TEST ACK” in DSC settings is set to ‘Auto TX’ (p. 65), the transceiver automatically transmits a reply call when a Test call is received. 7 About Received call information: • Push [EXIT] to return to the normal operating mode. • Push [BACK] to return to the previous screen. • Push [ACK] to go to the next step. Quick ACK: qq When a Test call is received, alarm sounds and the screen shown below is displayed.
7 DSC OPERATION ■ Making DSC calls DD Making a Test Acknowledgement call (continued) Manual ACK: qqEnter “TEST ACK” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Test ACK (Push [MENU].) (Rotate Dial, then push [ENT].) eeThe Test ACK confirmation screen is displayed. Push [CALL] to make an acknowledgement call. • If no Test call has been received, the “TEST ACK” item will not be displayed. • Push [EXIT] to return to the normal operating mode. • Push [BACK] to return to the previous screen.
DSC OPERATION DDMaking a Position Reply call Make a Position Reply call when a Position Request call is received. When the “POSITION ACK” in DSC Settings is set to ‘Auto TX’ (p. 65), the transceiver automatically transmits a reply call when a Position Request call is received. 7 About Received call information: • Push [EXIT] to return to the normal operating mode. • Push [BACK] to return to the previous screen. • Push [ACK] to go to the next step.
7 DSC OPERATION ■ Making DSC calls DD Making a Position Reply call (continued) Manual Reply: qqEnter “POSITION REPLY” in the DSC CALLS menu. rr While transmitting the reply call, the screen shown below is displayed, and then returns to the normal operating mode. MENU ➪ DSC Calls ➪ Position Reply (Push [MENU].) (Rotate Dial, then push [ENT].) • If no Position Request call is received, the Position Reply item will not be displayed. • Push [EXIT] to return to the normal operating mode.
DSC OPERATION DDMaking a Position Report Reply call Make a Position Report Reply call when a Position Report call is received. 7 About Received call information: • Push [EXIT] to return to the normal operating mode. • Push [BACK] to return to the previous screen. • Push [ACK] to go to the next step. Quick Reply: qq When a Position Report call is received, alarm sounds and the screen as shown below is displayed. Push [ALARM OFF] to stop the alarm.
7 DSC OPERATION ■ Making DSC calls DD Making a Position Report Reply call (continued) Manual Reply: qq Enter “REPORT REPLY” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Position Report Reply (Push [MENU].) (Rotate Dial, then push [ENT].) ee The Position Report Reply call confirmation screen is displayed. Push [CALL] to make an acknowledgement call. • If no Position Report Request call is received, the Position Report Reply item will not be displayed.
DSC OPERATION DDMaking a Polling Request Reply call Make a Polling Request Reply call when a Polling Request call is received. When the “POSITION ACK” in DSC Settings is set to ‘Auto TX’ (p. 65), the transceiver automatically transmits a reply call when receiving a Polling Request call. Quick Reply: qq When a Polling Request call is received, alarm sounds and the screen as shown below is displayed. Push [ALARM OFF] to stop the alarm.
7 DSC OPERATION ■ Making DSC calls DD Making a Polling Request Reply call (continued) Manual Reply: qqEnter “POLLING REPLY” in the DSC CALLS menu. MENU ➪ DSC Calls ➪ Polling Reply (Push [MENU].) (Rotate Dial, then push [ENT].) ee The Polling Request Reply call confirmation screen is displayed. Push [CALL] to make an acknowledgement call. • If no Polling Request call is received, the Polling Reply item will not be displayed. • Push [EXIT] to return to the normal operating mode.
DSC OPERATION 7 ■■Receiving DSC calls DD Receiving a Distress Call/Distress Acknowledgement [Example]: Receiving a Distress Call. [INFO] ➥➥ Push to display the Received call information. (p. 63) When a Distress Call is received: ➥➥ The emergency alarm sounds for 2 minutes. ➥➥ “RCVD DISTRESS” is displayed and the backlight blinks. [PAUSE] (For only USA version transceivers) ➥➥ Push to pause the countdown. qq Push [ALARM OFF] to stop the alarm and the blinking backlight.
7 DSC OPERATION ■ Receiving DSC calls (Continued) DD Receiving a Distress Relay Call/Distress Relay Acknowledgement [Example]: Receiving a Distress Relay call. [INFO] ➥➥ Push to display the Received call information. (p. 63) When a Distress Relay call is received: ➥➥ The emergency alarm sounds for 2 minutes. ➥➥ “RCVD DISTRESS RELAY” is displayed and the backlight blinks. qq Push [ALARM OFF] to stop the alarm and the blinking backlight.
DSC OPERATION 7 DDReceiving an Individual Call When an Individual Call is received: ➥ The alarm sounds for 2 minutes. ➥➥ “RCVD INDIVIDUAL CALL” is displayed. The backlight may blink for 2 minutes, depending on the received Category. qq Push [ALARM OFF] to stop the alarm and the blinking backlight. • Even if you do not push [ALARM OFF], the alarm stops after 2 minutes, and then the screen in step w is displayed. [INFO] ➥ Push to display the Received call information. (p.
7 DSC OPERATION ■ Receiving DSC calls (Continued) DD Receiving a Group Call/Geographical Area Call/All Ships Call When a Group Call, Geographical Area Call, or All Ships Call is received: ➥➥ The alarm sounds for 2 minutes. ➥➥ “RCVD GROUP CALL,” “RCVD GEOGRAPHICAL,” or “RCVD ALL SHIPS CALL” is displayed. The backlight may blink for 2 minutes, depending on the received Category. qq Push [ALARM OFF] to stop the alarm and the blinking backlight.
DSC OPERATION DDReceiving a Position Request Call When a Position Request Call is received: ➥ The alarm sounds for 2 minutes. ➥ “RCVD POS REQUEST” is displayed. The backlight blinks for 2 minutes. qq Push [ALARM OFF] to stop the alarm and the blinking backlight. • Even if you do not push [ALARM OFF], the alarm stops after 2 minutes, and then the screen in step w is displayed. 7 [ IGN] ➥ Push to ignore the Call and return to the normal operating mode. • The transceiver exits the DSC mode.
7 DSC OPERATION ■ Receiving DSC calls (Continued) DDReceiving a Position Report Call When a Position Report Call is received: ➥ The alarm sounds for 2 minutes. ➥ “RCVD POSITION REPORT” is displayed. The backlight blinks for 2 minutes. qq Push [ALARM OFF] to stop the alarm and the blinking backlight. • Even if you do not push [ALARM OFF], the alarm stops after 2 minutes, and then the screen in step w is displayed. ww Push a softkey to select your desired action.
DSC OPERATION DD Receiving a Polling Request call/Test Call [Example]: Receiving a Polling Request call. When a Polling Request call is received: ➥➥ The alarm sounds for 2 minutes. ➥➥ “RCVD POLLING REQUEST” is displayed. The backlight blinks for 2 minutes. qq Push [ALARM OFF] to stop the alarm and the blinking backlight. • Even if you do not push [ALARM OFF], the alarm stops after 2 minutes, and then the screen in step w is displayed.
7 DSC OPERATION ■ Receiving DSC calls (Continued) ■■Transmitted Call log When a Test Acknowledgement Call is received: ➥➥ The alarm sounds for 2 minutes. ➥➥ “RCVD TEST ACK” is displayed. The backlight blinks for 2 minutes. The transceiver automatically stores up to 50 transmitted calls, and the logs can be used as a supplement to your logbook. DDReceiving a Test Acknowledgement Call qq Push [ALARM OFF] to stop the alarm and the blinking backlight.
DSC OPERATION 7 ■■Received Call log The transceiver automatically stores up to 50 distress messages and 50 other messages, and they can be used as a supplement to your logbook. ee Push [Y]/[Z] to select the desired item, then push [ENT]. • While in the normal operating mode, “ ” blinks in the upper right corner of the LCD when there is an unread DSC message. DDDistress message qq Push [LOG] to enter “RCVD CALL LOG” in the DSC CALLS menu, or you can enter it through the Menu screen.
7 DSC OPERATION ■ Received Call log (Continued) DDOther messages qq Push [LOG] to enter “RCVD CALL LOG” in the DSC CALLS menu, or you can enter it through the Menu screen. MENU ➪ DSC Calls ➪ Received Call Log (Push [MENU].) (Rotate Dial, then push [ENT].) rrRotate Dial to scroll the DSC message contents. • The stored message has various information, depending on the DSC call type. Rotate wwPush [Y]/[Z] to select “Others,” then push [ENT].
DSC OPERATION 7 ■■DSC Settings D Position Entry (See page 25) D Add Individual ID/Group ID (See pages 22, 23) D Delete Individual ID/Group ID (See page 24) ww Rotate Dial to select “Auto TX” or “Manual TX,” then push [ENT]. • Push [BACK] to cancel and return to the DSC Settings menu. D Automatic Acknowledgement These items set the Automatic Acknowledgement function to “Auto TX” or “Manual TX.
7 DSC OPERATION ■ DSC Settings (Continued) D Channel Auto Switch function/Channel 16 Switch function Channel Auto Switch Function: (For only USA version transceivers) By regulation, after receiving a DSC call, the transceiver changes the operating channel to the channel assigned by the received DSC call. However, when this setting is set to “OFF,” the function enables the transceiver to remain on the operating channel, even after receiving a Distress call.
DSC OPERATION 7 D Alarm D Channel 70 Squelch level Set the Alarm function ON or OFF, depending on the Category or Status. Set the squelch level on Channel 70. The transceiver has 11 squelch levels between 1 (loose squelch) and 10 (tight squelch) and OPEN. OPEN is completely open. q Enter “ALARM” in the DSC Settings menu. MENU ➪ DSC Settings ➪ Alarm (Push [MENU].) (Rotate Dial, then push [ENT].) w Rotate Dial or push [Y]/[Z] to select the status, then push [ENT].
7 DSC OPERATION ■ DSC Settings (Continued) D DSC Loop Test The DSC loop test function sends transmit DSC signals to the receive AF circuit to compare and check the TX and RX signals at the AF level. q Enter “DSC LOOP TEST” in the DSC Settings menu. MENU ➪ DSC Settings ➪ DSC Loop Test (Push [MENU].) (Rotate Dial, then push [ENT].) w Push [ENT] to start the DSC loop test. • Push [BACK] to return to the previous screen. • When the transmit DSC and receive DSC signals match, “OK” is displayed.
DSC OPERATION 7 ■■Making an Individual call using an AIS transponder When the optional MA-500TR CLASS B AIS TRANSPONDER is connected to your transceiver, an individual DSC call can be transmitted to a selected AIS target, without needing to enter the target’s MMSI code. In this case, the call type is automatically set to Routine. See page 85 for connecting instructions. To ensure correct operation of the DSC function, make sure you correctly set the CH70 SQL LEVEL. (p.
7 DSC OPERATION ■ Making an Individual call using an AIS transponder (Continued) rr After making the individual DSC call, the transponder will display “DSC Transmission COMPLETED.” ‘Able to comply’ is received • Push [CLEAR] to return to the screen displayed before you entered the voice channel selection screen in step w. • The transceiver stands by on Channel 70 until an acknowledgement is received.
OTHER FUNCTIONS 8 ■■Using the Intercom The optional Intercom function allows you to talk between the transceiver and the where the Command microphone is located. The optional HM-195 command microphone is required for Intercom operation. Connect the HM-195 command microphone as described on page 89. While using the intercom: • Transmitting is disabled. • Received audio is muted. qqHold down [PWR](Dial) to turn ON the power.
8 OTHER FUNCTIONS ■■Using the RX Speaker ■■ Using the PA (Public Address) The RX Speaker function enables you to hear the received audio through a PA speaker. Connect a PA speaker as described on page 84. The transceiver has a PA function to make announcements through a PA speaker. Connect a PA speaker rated at more than 10 W at 10% distortion with a 4 ˘ load, as described on page 84. • Transmitting is disabled while in the PA mode. qq Push [RX ] to enter the RX Speaker mode.
OTHER FUNCTIONS ■■Using the Horn The Horn function sounds a horn. Connect a PA speaker as described on page 84. qqPush [HORN] to enter the Horn mode. wwHold down [HORN] to sound a horn. • While holding down [HORN], the horn sounds, and the screen below is displayed. • Rotate Dial or push [Y]/[Z]/[Ω]/[≈] to adjust the horn volume level. eePush [EXIT] to return to the normal operating screen.
9 MENU SCREEN OPERATION ■■Using the Menu screen The Menu screen is used for entering infrequently changed values, function settings or making DSC calls. In addition to this page, see pages 75 through 83 for details. DD Entering the Menu screen Example: Set the channel group to “USA” qqPush [MENU]. ww Rotate Dial or push [∫]/[√] to select the root item (Radio Settings), and then push [ENT]. Menu lists [Y]/[Z] [ENT] • If [∫] or [√] is continuously held down, the items are sequentially highlighted.
9 MENU SCREEN OPERATION ■■Menu screen items DDRadio Settings Item The Menu screen contains the following items. • Scan Type • Scan Timer • Dual/Tri-Watch DDDSC Calls Item Ref. • Individual Call • Individual ACK*1 • Group Call • All Ships Call • Distress Call • Distress Relay ACK*5 • Received Call Log p. 32 p. 34 p. 36 p. 38 p. 26 p. 30 p.
9 MENU SCREEN OPERATION ■■Radio Settings items DDScan type DDDual/Tri-watch The transceiver has two scan types, Normal scan and Priority scan. A Normal scan searches all Favorite channels in the selected channel group. A Priority scan sequentially searches all Favorite channels, while monitoring Channel 16. This item can be selected as Dualwatch or Tri-watch. (p. 21) (Default: Dualwatch) • The default setting is different depending on the transceiver versions.
MENU SCREEN OPERATION 9 DDWeather alert DDRT Indicator (For only USA and Australian version transceivers) A NOAA broadcast station transmits a weather alert tone before important weather information. After the transceiver detects the alert, “WX ” blinks until the transceiver is operated. (For only USA version transceivers) Select weather or not to display RT (Radio Telephone) icon (p. 5) while receiving or transmitting a signal, and when the channel is changed.
9 MENU SCREEN OPERATION ■■Configuration items DDBacklight DDKey Assignment The function display and keys can be backlit for better visibility under low light conditions. The backlight can be set to 7 levels and OFF. (Default: 7) Desired functions can be assigned to Dial and the softkeys. qq When the “KEY ASSIGNMENT” screen is displayed, rotate Dial or push [∫]/[√] to select “Dial” or “Softkeys,” and then push [ENT]. ww Rotate Dial or push [∫]/[√] to select the desired position, and then push [ENT].
MENU SCREEN OPERATION rr Push [EXIT] to exit the Menu screen. • Push [CLEAR] or [BACK] to return to the previous screen. • Dial assignment The Audio volume (VOL), squelch (SQL), channel selection (CHAN), and LCD backlight level (Backlight) functions can be assigned to any one of 4 sequential positions on Dial. Pushing Dial 1 to 4 times sequentially selects the desired function, and rotating Dial adjusts the level or selects a value or number.
9 MENU SCREEN OPERATION ■ Configuration items (Continued) DDUTC Offset Set the offset time between the UTC (Universal Time Coordinated) and your local time to between –14:00 and +14:00 (in 1 minute steps). (Default: 00:00) DDNoise Cancel Set the Noise Cancel function for both receive and transmit. • RX Turn the receive Noise Cancel function ON or OFF. OFF : Turns OFF the function.
MENU SCREEN OPERATION DDInactivity Timer Set the inactivity timer to between 1 and 10 minutes (in 1 minute steps) or OFF for a “Not DSC Related” item, and set it to between 1 and 15 minutes (in 1 minute steps) or OFF for a “DSC Related” item. The count down alarm sounds 10 seconds before the Inactive timer returns the current screen to the normal operating screen.
9 MENU SCREEN OPERATION ■ Configuration items (Continued) DDNMEA Output Select the Data Output function option for a NMEA output port. • POS data output (Default: OFF) When receiving position data from an external or the built-in GPS receiver,* this function sends the data from the NMEA Output port to an external device. *For only IC-M423G and IC-M424G.
MENU SCREEN OPERATION DDRemote ID Set a Remote ID number to between 1 and 69. The Remote ID is included in the sentence of the Icom original NMEA format. (Default: 15) DDCOMMANDMIC Speaker (Displayed only when the optional HM-195 is connected.) The HM-195’s external speaker can be used instead of the internal speaker. (Default: Internal Speaker) • The “COMMANDMIC SP” screen is displayed on the HM-195’s display. Not displayed on the transceiver’s display. Internal Speaker : Turns ON the internal speaker.
10 CONNECTIONS AND MAINTENANCE ■■Connections q y t r w e q ANTENNA CONNECTOR Connects to a marine VHF antenna cable’s PL-259 connector. CAUTION: Transmitting without an antenna may damage the transceiver. w NMEA IN/OUT LEADS Brown: Talker B (Data-L), Data Out (–) White: Talker A (Data-H), Data Out (+) Connect to NMEA input lines of navigation equipment, to receive position data of other ships. • A NMEA 0183 (ver. 2.
CONNECTIONS AND MAINTENANCE r DC POWER CONNECTOR Connects to a 13.8 V DC power source. (+: Red, –: Black) CAUTION: After connecting the DC power cable, NMEA leads, external speaker leads, and PA speaker leads, cover the connector and leads with an vulcanizing tape, as shown below, to prevent water seeping into the connection. Rubber vulcanizing tape DDConnect to the MA-500TR Connect the transceiver to the high-density D-Sub 15-pin connector of the MA-500TR using the OPC-2014* cable.
10 CONNECTIONS AND MAINTENANCE ■■Antenna ■■Supplied accessories A key element in the performance of any communication system is the antenna. Ask your dealer about antennas and the best place to mount them. ■■Fuse replacement One fuse is installed in the supplied DC power cable. If the fuse blows or the transceiver stops functioning, track down the source of the problem, repair it, and replace the damaged fuse with a new one of the proper rating.
CONNECTIONS AND MAINTENANCE 10 ■■Mounting the transceiver DDUsing the supplied mounting bracket The universal mounting bracket supplied with your transceiver allows overhead or dashboard mounting. qq Mount the bracket securely to a surface which is more than 10 mm thick and can support more than 5 kg using the two supplied screws (5 × 20 mm). ww Attach the transceiver to the bracket so that the face of the transceiver is at 90° to your line of sight when operating it.
10 CONNECTIONS AND MAINTENANCE ■■MB-132 installation An optional MB-132 flush mount is available for mounting the transceiver to a flat surface, such as an instrument panel. ee Attach the clamps on either side of the transceiver with two M5 × 8 mm supplied bolts. • Make sure that the clamps align parallel to the transceiver body. KEEP the transceiver and microphone at least 1 meter away from your vessel’s magnetic navigation compass.
CONNECTIONS AND MAINTENANCE 10 ■■Microphone installation ee Using the mounting base as a template, carefully mark the holes where the cable and three screws will be fastened. rrDrill holes at these marks. tt Install the mounting base using the supplied screws, as shown below. Mounting base Nut Gasket The optional HM-195 should be connected to the transceiver using the supplied OPC-1540 connection cable. The cable is used to operate from a longer distance.
10 CONNECTIONS AND MAINTENANCE Mounting base Nut Gasket 90 Cap
SPECIFICATIONS AND OPTIONS ■■Specifications DDGeneral • Frequency coverage: Tx IC-M423/IC-M423G 156.000–161.450 MHz IC-M424/IC-M424G 156.025–157.425 MHz IC-M423 (CHN/AUS version) 156.025–157.425 MHz Rx IC-M423/IC-M423G 156.000–163.425 MHz IC-M424/IC-M424G 156.050–163.275 MHz IC-M423 (AUS version) 156.050–163.275 MHz IC-M423 (CHN version) 156.050–162.025 MHz CH70 156.
11 SPECIFICATIONS AND OPTIONS ■ Specifications DD Receiver (continued) ■■Options • Spurious response rejection ratio: FM More than 70 dB DSC More than 73 dBµ emf (1% BER) • Adjacent channel selectivity: FM More than 70 dB DSC More than 73 dBµ emf (1% BER) • Audio output power: IC-M423/IC-M423G More than 10 W at 10% distortion into a 4 Ω load IC-M424/IC-M424G 10 W at 10% distortion into a 4 Ω load IC-M423 (CHN/AUS version) 10 W at 10% distortion into a 4 Ω load • MB-
CHANNEL LIST Channel number USA*5 INT CAN*4 01 01 01A 02 02 03 03 03A 04 04A 05 05A 05A 06 06 06 07 07A 07A 08 08 08 09 09 09 10 10 10 11 11 11 12 12 12 13*2 13 13*1 14 14 14 15*2 15*1 15*1 16 16 16 17*1 17 17*1 18 18A 18A 19 19A 19A 20 20*1 20 20A Frequency (MHz) Transmit Receive 156.050 160.650 156.050 156.050 156.100 160.700 156.150 160.750 156.150 156.150 156.200 160.800 156.200 156.200 156.250 160.850 156.250 156.250 156.300 156.300 156.350 160.950 156.350 156.350 156.400 156.400 156.450 156.450 156.
13 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE The transceiver does • Bad connection to the power source. not turn ON. Little or no sound comes • Squelch level is set too high. from the speaker. • Volume level is set too low. • Speaker has been exposed to water. SOLUTION • Check the connection to the transceiver and power source. • Set the squelch to the threshold point. • Set the volume to a suitable level. • Remove the water with the AquaQuake function.
TEMPLATE 14 180 (7 3⁄32) 165.1 (6 1⁄2) 2 (3⁄32) HM-195 MB-132 82 (3 7⁄32) 62.4 (2 15⁄32) R12 (Max.) 29.5 to 31.
INFORMATION ■■Country code list ■■Disposal • ISO 3166-1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Country Austria Belgium Bulgaria Croatia Czech Republic Cyprus Denmark Estonia Finland France Germany Greece Hungary Iceland Ireland Italy Latvia Codes AT BE BG HR CZ CY DK EE FI FR DE GR HU IS IE IT LV 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Country Liechtenstein Lithuania Luxembourg Malta Netherlands Norway Poland Portugal Romania Slovakia Slovenia Spain Sweden Switzerland Turkey United Kingdom
INDEX A D H Accessories, supplied........................ 86 Acknowledgement, Automatic........... 65 Alarm ............................................... 67 All Ships call Making a call...................................38 Receiving a Call............................. 58 Antenna............................................. 86 AquaQuake.........................................18 ATIS code...........................................10 Display contrast................................. 78 Disposal.........
INDEX N S NMEA Output.................................... 82 Noise Cancel..................................... 80 Scan Scan resume timer........................ 76 Scan types.................................... 19 Starting a scan.............................. 20 Softkey function................................... 7 Specifications.................................... 91 Speaker Microphone........................... 8 Squelch.............................................. 15 O Operating Rules...............
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