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A standard handheld marine VHF, mandatory on larger seagoing vessels under the GMDSS rules A VHF set and a VHF channel 70 DSC set, the DSC on top A vintage (76–89) marine VHF radiotelephone. Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship ...
Radio transmitter with a label indicating it will identify any transmisssions from it as coming from "PF7297" using the ATIS protocol [1] The Automatic Transmitter Identification System (ATIS) is a marine VHF radio system used and mandated on navigable inland waterways in Europe for identifying the ship or vessel that made a radio transmission.
Very high frequency (VHF) is the ITU designation [1] [2] [3] for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high ...
2182 kHz is a medium-wave frequency still used for marine emergency communication. Marine VHF radio is used in coastal waters and relatively short-range communication between vessels and to shore stations. Radios are channelized, with different channels used for different purposes; marine Channel 16 is used for calling and emergencies.
For VHF, DSC has its own dedicated receiver for monitoring Channel 70, but uses the main VHF transceiver for transmission. However, for the user, the controller is often a single unit. [ 1 ] MF/HF DSC devices monitor multiple bands for distress, urgency and safety sécurité transmissions in the 2, 4, 6, 8, 12 and 16 MHz marine bands.
In addition to these, the general purpose channel 156.000 MHz is available. 156.000 MHz is sometimes included as Marine VHF radio "channel 0" or "M1" (private) channel, allowing communication between portables and radios mounted in boats. Modulation is FM, maximal power 4 watts for 30–31 MHz and 5 watts for 155 MHz.