MF/HF Radio · GMDSS
The Icom IC-M803 MF/HF SSB 150W is a marine MF/HF radio installation. It is normally installed at the bridge radio console with external antenna, tuner and earthing/counterpoise system. It is designed for long-range voice and distress/safety communication beyond normal VHF range. The operating principle relies on MF/HF radio transmission and reception, with DSC where fitted/approved. Compared with neighbouring models, the relevant differences are transmitter output, antenna tuner, control unit and GMDSS interfaces; these must be confirmed from the installed documentation rather than inferred from the model designation alone. Service and survey attention should concentrate on transmit/receive checks, tuner/antenna/grounding, cooling, identity/position inputs and power. For exact ratings, dimensions, tolerances, test limits and model-specific settings, refer to the manufacturer documentation for the exact figure.
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What our service work and the manufacturer documentation say about keeping this model running.
Carry out the permitted operational/self-tests, inspect antennas, feeders, connectors, controls and cooling, and verify normal and emergency power where required. Check vessel identity, position and interfaces appropriate to the equipment type and review recurring alarms or logbook entries. A radio surveyor should confirm the installation and programmed data against the approved radio documentation.
Carry fuses, approved handsets/microphones or control accessories where applicable, antenna connectors and feeder repair items, selected power-supply components and manufacturer-recommended interface/control spares. The spare scale should match the vessel's declared GMDSS maintenance method.
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