Enhanced marine communication

The Icom IC-M423G VHF/DSC Marine Radio is an enhanced version of the Icom IC-M423. This VHF radio is improved with more features to make marine communication easier and more reliable. It comes equipped with an integrated GPS receiver which allows your current position and time to be used for DSC calls. The radio also sports a slick new white backlight LCD for improved visibility, a smart looking new HM-205B Speaker-microphone and a large 45mm diameter speaker.

Built-in GPS Receiver
The built-in GPS receiver shows your current position and time and can be used for DSC calls. GPS data source is selectable from internal and external GPS (and GPS-OFF).

New HM-205B/SW Speaker-Microphone
High grade speaker-microphone, HM-205B/SW is supplied with the IC-M423G. The HM-205B/SW has channel Up/Down, channel 16/call channel and transmit power (Hi/Low) buttons and a large 45mm diameter speaker.

Active Noise Cancelling
Using digital signal processing technology, the built-in active noise canceller reduces background noise to up to 90% in the received signal and 30% in the transmitting signal.

Intuitive User Interface
The menu system provides easy and intuitive operation. The bottom line of the dot-matrix display shows the software key functions which can be toggled with the left and right buttons. The directional keypad allows you to perform various operations and settings.

10W Loud Audio, Public Address and Foghorn
The IC-M423G has a built-in 10W amplifier that increases the audio output from an external PA speaker. The public address function allows you to make an announcement from the microphone like a loud speaker, and the foghorn can also be emitted from the external PA speaker.

Built-in Class D DSC
The built-in DSC watch function monitors Ch. 70 (DSC channel) activity, even while you are receiving another channel. DSC functions include: distress, individual, group, all ships, urgency, safety, position request/report, polling request and DSC test calls.

AIS Target Call
When connected to an optional MA-500TR Class B AIS transponder, the AIS target call function allows you to make an individual DSC call without having to manually input an MMSI number.

MarineCommander Compatible
When connected to the MarineCommander, the received DSC message pops up on the multifunction display.

IPX7 Submersible Protection
The IC-M423G withstands submersion in up to 1.0m depth of water for 30 minutes. It is equivalent to the IPX7 standard.

Icom IC-M423G VHF/DSC Marine Radio Features:

• Built-in GPS receiver
• White backlight LCD and laser-cut keypad
• New HM-205B speaker-microphone
• Active noise cancelling
• Intuitive user interface
• 10W loud audio, public address and foghorn
• Built-in class D DSC
• AIS target call
• MarineCommander compatible
• IPX7 submersible protection
• NMEA 0183 connectivity
• AquaQuake™ draining function
• Favourite channel function
• Dual/tri-watch function for monitoring Ch.16 and/or call channel
• Priority and normal scan
• Built-in attenuator for local communication
• Black and super white versions available

Icom IC-M423G VHF/DSC Marine Radio Specifications:

General

• Frequency coverage: Tx 156.000–161.450 MHz, Rx 156.000–163.425 MHz, CH70 156.525 MHz
• Mode: 16K0G3E (FM), 16K0G2B (DSC)
• Channel spacing: 25 kHz
• Operating temperature range: –20 C to +60 C; –4 F to +140 F
• Current drain (at 13.8 V): TX high 5.5 A maximum, Maximum audio 5.0 A maximum
• Power requirement (negative ground): 13.8 V DC nominal
• Frequency stability: +/- 1.5 kHz (–20 C to +60 C; –4 F to +140 F)
• Antenna impedance: 50 Ohms nominal
• Dimensions (approximately): 180(W) × 82(H) × 135(D) mm ; 7.1(W) × 3.2(H) × 5.3(D) inches
• Weight (approximately): 1.2kg; 2.6lb

Transmitter

• Output power: 25 W/1 W
• Modulation system: Variable reactance frequency modulation
• Maximum frequency deviation: +/-5.0 kHz
• Spurious emissions: Less than 0.25 micro W

Receiver

• Receive system: Double conversion superheterodyne
• Sensitivity: FM –5 dBu emf typical (at 20 dB SINAD); DSC –4 dBu emf typical (1% BER)
• Squelch sensitivity: Less than –2 dBu emf
• Intermodulation rejection ratio: FM - More than 68 dB; DSC - More than 68 dBu emf (1% BER)
• Spurious response rejection ratio: FM - More than 70 dB; DSC - More than 73 dBu emf (1% BER)
• Adjacent channel selectivity: FM - More than 70 dB; DSC - More than 73 dBu emf (1% BER)
• Audio output power: More than 10 W at 10% distortion into a 4 Ohm load

Icom IC-M423G VHF/DSC Marine Radio with GPS Receiver Product Manual