Icom IC-M804 MF/HF Marine SSB Transceiver with DSC

Long range communications beyond the horizon

The Icom IC-M804 MF/HF Marine SSB Transceiver is a long-range MF/HF Class E DSC radio, expertly engineered for ocean-going sailors and commercial non-GMDSS operators. Based on the MED-approved Class A GMDSS radio GM800, the IC-M804 is packed with features to keep users safe including an intuitive user interface, and colour TFT LCD display, audio replay, GPS and more. It conforms to the latest European and International standards and is CE marked for the European Radio Equipment Directive (RED). It’s currently the only CE-marked Class E DSC Marine MF/HF radio available. (At time of publication (10/11/21).

Distress Button for Emergencies
The IC-M804 meets ITU-R M.493-15 and ETSI EN 300 338-4 Class E DSC regulations. In an emergency, by pressing the large independent Distress button, a digital Distress signal is sent with GNSS coordinates and calls for help to other ships or coast stations.

Built-in DSC Watch-Keeping Receiver
The dedicated DSC watch-keeping receiver continuously scans the six distress channels in rotation. A total of 100 MMSI numbers (75 Individual and 25 Group) for DSC calls can be stored with a 10-character ID name.

Intuitive User Interface
The combination of the directional keypad and soft keys provides a simple operation. The most common functions are assigned to soft keys (at the bottom of the display) for quick push function access. The large ten-key pad enables you to smoothly enter channel numbers, MMSI numbers with ID names, etc.

Wide Viewing Angle Colour TFT Display
A high-resolution colour LCD provides an almost 180 degree very wide viewing angle and displays characters and function icons clearly. The night mode display ensures good readability in the dark for further convenience.

Two-minute Instant Replay Memory
The Instant Replay function automatically records the last 2 minutes of received audio. You can playback the audio you could not hear clearly, and will not miss any incoming call.

Meets Strict Environmental Requirements
The IC-M804 has passed rigorous environmental testing and quality assurance processes. It is designed to provide reliable operation and corrosion-resistant durability under harsh maritime environments. The controller has IPX7 protection (1 m depth of water for 30 minutes).

Integrated GNSS Receiver
The GNSS receiver which includes GPS, GLONASS and SBAS functions, is integrated into the IC-M804. Your position data, course, speed and UTC data can be received with a simple connection to the supplied GNSS antenna with a 5 m cable.

NMEA 2000™, NMEA 0183/-HS Connectivity
Using NMEA 2000™ connectivity, the IC-M804 can exchange GNSS, DSC call information, radio information and PGN list data on the network. NMEA 0183/-HS GNSS position data can also be converted to NMEA 2000™ data for other equipment.

AT-141 Automatic Antenna Tuner
The AT-141 (#64) automatic antenna tuner matches all bands to your antenna. If due to a fault the automatic tuner cannot tune the antenna, the IC-M804 bypasses the tuner and will display an alert on the display.

Icom IC-M804 MF/HF Marine SSB Transceiver Features:

• Distress button for emergencies
• Built-in DSC watch-keeping receiver
• 4.3 inch wide angle colour TFT display
• Two minutes instant replay memory
• Intuitive user interface
• Meets strict environmental requirements
• Integrated GNSS receiver
• AT-141 automatic antenna tuner
• 125 W (PEP) of RF output through AT-141 output power
• 0.5–29.999 MHz continuous receiver coverage
• Advanced RF direct sampling system employed
• 12 or 24 volt DC power source (depending on version)
• Programmable microphone button for quick function access

Icom IC-M804 MF/HF Marine SSB Transceiver Specifications:

General

• Model: IC-M804
• Frequency:
  
  • RX: 0.5 ~ 29.9999 MHz (Continuously)
  • TX: 1.6 ~ 2.9999 MHz, 4.0 ~ 4.9999 MHz, 6.0 ~ 6.9999 MHz, 8.0 ~ 8.9999 MHz, 12.0 ~ 13.9999 MHz, 16.0 ~ 17.9999 MHz, 18.0 ~ 19.9999 MHz, 22.0 ~ 22.9999 MHz, 25.0 ~ 27.5000 MHz
• DSC (RX): 2.1875 MHz, 4.2075 MHz, 6.3120 MHz, 8.4145 MHz, 12.5770 MHz, 16.8045 MHz
• Mode:
  
  • RX/TX: J3E (USB), J2B (AFSK), F1B (FSK)
  • RX only: J3E (LSB), A1A (CW), H3E (AM)
  • DSC: F1B
• Number of channels:
  
  • User channels: 160
  • ITU SSB simplex channels: 72
  • ITU SSB duplex channels: 249
  • ITU FSK channels: 193
• Antenna connector: SO-239 x 2
• Antenna impedance: 50 Ohms (Unbalanced)
• Frequency stability: +/- 10Hz (Transceiver and DSC)
• Power supply management: 10.8 ~ 15.6V negative ground (12V DC); 21.6 ~ 31.2V negative ground (24V DC)
• Current drain (with 1.1kHz and 1.7kHz AF input):
  
  • RX: Less than 6.0A (12V), less than 3.0A (24V) at maximum audio output
  • TX: Less than 40A (12V), less than 20A (24V) at maximum output power
• Usable temperature range: -15deg C ~ +55deg C
• Dimensions (projections not included)(W x H x D): 367 x 95 x 260mm (main unit); 274 x 114 x 86mm (controller)
• Weight: 8.6kg (main unit); 760g (controller)

Transmitter

• Output power (at the tuner output): 85W PEP (1.6 ~ 3.9999MHz); 125W PEP (4.0 ~ 27.5000)
• Spurious emissions (at maximum power): Less than 50 dB for peak output power
• Carrier supperession (at maximum power): More than 40 dB for peak output power
• Unwanted sideband suppression (at maximum power): More than 55dB for peak output power (with 1500Hz AF input)

Receiver

• Sensitivity:
  
  • RX:
    
    • J3E, A1A: 0.5 ~ 1.59999 MHz 30 dBµV emf (20 dB SINAD), 1.6 ~ 29.9999 MHz 8 dBµV emf (20 dB SINAD)
    • J2B, F1B: 1.6 ~ 29.9999 MHz 0 dBµV emf (20 dB SINAD)(at 1% error rate)
    • H3E: 0.5 ~ 1.5999 MHz 44 dBµV emf (20 dB SINAD), 1.6 ~ 3.9999 MHz 24 dBµV emf (20 dB SINAD)
    • DSC (RX): 0 dBµV emf (at 1% error rate)
• Squelch sensitivity (S-metre):
  
  • J3E (at 12.230 MHz): Less than +26 dBµV emf (threshold); less than +96 dBµV emf (tight)
  • H3E (at 1.000 MHz): Less than +36 dBµV emf (threshold); less than +116 dBµV emf (tight)
• Spurious response rejection:
  
  • J3E: More than 60dB (1.6 ~ 29.9999 MHz)
  • DSC: More than 90 dBµV emf
• Clarity variable range: +/- 150 Hz

Note: All stated specifications are subject to change without notice or obligation.

Icom IC-M804 MF/HF Marine SSB Transceiver Product Manual