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Icom IC-M400BB
VHF Marine Black Box Transceiver

Icom’s M400BB is perfect for boats that need a radio but don’t have room on the helm. The M400BB consist of a two-piece, black box configuration. Install the full RF black box unit in an out-of-sight place and connect the COMMANDMICIV™, HM-195 to the cockpit or fly bridge. The HM-195 allows operation of all radio functions including DSC, radio, foghorn and hailer horn. The HM-195 also utilizes the same user soft key interface used on Icom’s latest range of marine radios for easy operation.

Output power:   25W
Hailer/PA:   10W PA
Horn/Foghorn:   Built-in
Waterproof rating:   IPX7 (Radio and microphone)
Versions:   Radio with HM195B
Radio with HM195SW

Active noise cancelling

The built-in bidirectional active noise cancelling reduces background noise to up to 90% and improves both your transmitted voice and incoming call. Hear and be heard more clearly.

10W Amplifier

The M400BB has a built-in 10W amplifier that increases the audio output from an additional external 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 speaker.

NMEA Interface

When connected to an external GPS receiver, current position and time are shown on the COMMANDMIC™ display. When receiving DSC information from another vessel, the radio can transfer it to a navigational device via NMEA 0183 connectivity.

Additional features

  • AquaQuake™ water draining function
  • Dual/tri-watch function for monitoring Ch.16 and/or call channel
  • Priority and normal scan
  • Class D DSC
  • Connect to the optional MA-500TR and the AIS target call function allows you to set up an individual DSC all from the MA-500TR.
icom m400bb
Icom IC-M400BB Specifications:
Frequency range
Tx: 156.025–157.425MHz
Rx: 156.050–163.275MHz
C. 70: 156.525MHz
Usable channel groups
INT, USA, CAN and WX channels
Type of emission
16K0G3E (FM), 16K0G2B (DSC)
Operating temperature range (except BP-227)
–20°C to +60°C ( –4°F to +140°F)
Antenna impedance
50Ω (SO-239)
Current drain (at 7.4V DC)
Tx (at 25W output): 5.5A Max.
Rx (Max audio.): 3.5A Max.
IC-M400BB: 216×79×125mm; 8.5×3.11×4.92 in 
HM-195B/SW: 67.5×144.5×37mm; 2.66×5.69×1.46 in
IC-M400BB: 830g; 1.83 lb
HM-195B/SW: 400g; 14.1 oz
NMEA in/out formats
Output power (Hi/Low)
25W, 1W (High, low)
Max. frequency deviation
± 5.0 kHz
Spurious emissions
Less than –70dBc (at 25W)
Frequency tolerance
Sensitivity (at 12dB SINAD)
Main: 0.22μV typical (at 12dB SINAD)
Ch. 70: –5dBμ emf typ. (1% BER)
Squelch sensitivity
Less than 0.32μV
Adjacent channel selectivity
Main: More than 70dB
Ch. 70: More than 73dBμ emf (1% BER)
Spurious response
Main: More than 70dB
Ch. 70: More than 73dBμ emf (1% BER)
Intermodulation rejection
Main: More than 70dB
Ch. 70: More than 68dBμ emf (1% BER)
Hum and noise ratio
More than 40dB
Audio output power
Internal speaker: More than 2W (HM-195B/SW)
External speaker: More than 10W (RX Speaker)

Measurements made in accordance with TIA/EIA 603 and IEC 62238 (Ch. 70 receiver specifications).

Unit Accessories button

icom m400bb

Package Includes:
• IC-M400BB
• COMMANDMIC, either HM-195B or HM-195SW
DC power cable




ic-m400bb diagram


Icom IC-M400BB Marine VHF Transceiver


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