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      • Annex 1 – Positioning and technical details of lights and shapes
      • ANNEX II – Additional Signals for Fishing Vessels Fishing in Close Proximity
      • ANNEX III – Technical Details of Sound Signal Appliances
      • ANNEX IV – Distress Signals
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Technical Aspects of GMDSS Equipments – Propagation, Modulation, Terrestrial Equipment & Antenna

Technical Aspects of GMDSS Equipments

GMDSS Radio Signals Radio signals are transmitted as electromagnetic radiation and occupy the frequency range 3 kHz ~ 300 GHz. The radiofrequency range is divided into a number of bands. In the GMDSS system both terrestrial and satellite methods of communications are interlocked in order to provide an extremely reliable scheme to alert rescue authorities in the event of a vessel being in distress. Frequencies in the MF, HF and VHF bands are used for terrestrial communications via Coast Radio Stations (CRS). Frequencies in the SHF bands are used for satellite communications. It's important … [Read more...]

By Cult of Sea Filed Under: Gmdss Tagged With: AGC, antenna, cospas, crs, duplex, ehf, gmdss, HF, inmarsat, MF, modulation, propagation, radio frequencies, radio signal, sensitivity control, shf, ship station, simplex, technical, terrestrial, uhf, vhf, vlf

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