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** VHF RADIO EXPLAINED **

Marine VHF radio is installed on all large ships and most motorized small craft. It is used for a wide variety of purposes, including summoning rescue services and communicating with harbours and marinas, and operates in the VHF frequency range, between 156 to 174 MHz. Although it is widely used for collision avoidance, its use for this purpose is contentious and is strongly discouraged by some countries, including the UK. [1]

A marine VHF set is a combined transmitter and receiver and only operates on standard, international frequencies known as "channels". Channel 16 (156.8 MHz) is the calling and emergency channel. Transmission power ranges between 1 and 25 watts, giving a maximum range of up to about 60 nautical miles (111 km) between aerials mounted on tall ships and hills, and 5 nautical miles (9 km) between aerials mounted on small boats at sea-level. [2]

Marine VHF mostly uses "simplex" transmission, where communication can only take place in one direction at a time. A transmit button on the set or microphone determines whether it is operating as a transmitter or a receiver. The majority of channels, however, are set aside for "duplex" transmissions channels where communication can take place in both directions simultaneously

Each duplex channel has two frequency assignments. This is mainly because, in the days before mobile phones and satcomms became widespread, the duplex channels could be used to place calls on the public telephone system for a fee via a marine operator.

This facility is still available in some areas, though its use has largely died out. In US waters, Marine VHF radios can also receive NOAA Weather Radio broadcasts, where they are available, on receive-only channels wx1, wx2, etc.

Types of equipment

Sets can be fixed or portable. A fixed set generally has the advantages of a more reliable power source, higher transmit power, a larger and more effective aerial and a bigger display and buttons. A portable set can be carried to a lifeboat in an emergency, has its own power source and is more easily water-proofed.

Marine radios can be "voice-only" or can include "Digital Selective Calling".

Voice-only equipment is the traditional type, which relies totally on the human voice for calling and communicating.

Digital Selective Calling equipment, a part of GMDSS, provides all the functionality of voice-only equipment and, additionally, allows several other features:

  • vhf a transmitter can call a receiver automatically using Digital Selective Calling on Channel 70, using a telephone-type number known as a Maritime Mobile Service Identity or MMSI
  • vhf a distress button, which automatically sends a digital distress signal identifying the calling vessel and the nature of the emergency
  • vhf a connection to a GPS receiver allowing the digital distress message to contain the distressed vessel's position

The MMSI is a nine digit number identifying a VHF set or group of sets. The left hand digits of MMSI indicate the country and type of station. For example, here are MMSI prefixes of four station types:

  • vhf Ship : 23 is the United Kingdom – e.g. a UK ship : 232003556
  • vhf Coast : 00 – e.g. Solent Coastguard : 002320011
  • vhf Group of stations : 0 – e.g. 023207823
  • vhf Portable DSC equipment : for UK 2359 - e.g. 235900498

 

dit Operating procedures

Proper operating procedures for marine radio include:

  • Listening before transmitting
  • Using Channel 16 only to establish communication (if necessary) and then switch to a different channel
  • using a set of international "calling" procedures such as the "Mayday" distress call and the "Pan-pan" urgency call
  • using "pro-words" based on the Englis language such as Acknowledge, All after, All before, All stations, Confirm, Correct, Correction, In figures, In letters, Over, Out, Radio check, Read back, Received, Repeat, Say again, Spell, Standby, Station calling, This is, Wait, Word after, Word before, Wrong
  • using the NATO phonetic alphabet: Alpha, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliet, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu
  • using a phonetic numbering system based on the English language: Wun, Too, Tree, Fow-er, Fife, Six, Sev-en, Ait, Nin-er, Zero, Decimal

Marine VHF radio is sometimes illegally operated inland. Since enforcement is often the job of the local coast guard, enforcement away from the water is sometimes difficult.


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SERPAIRS

We carry a complete range of Sea doo and Jet Ski parts also Seadoo boats.If you can not find the part you require at our online Jet Ski shop ,Please call on 01227 771 831 and we will be glad to assist you with any Jet Ski or parts request.

service We also Have a second to none Jet Ski workshop that can handle almost any job you throw at us. Most of the work is carried out in house by fully qualified Jet Ski engineers. We also specialise in the manufacture of custom built Jetski and Boat trailers & launch trolleys, specifically designed to suit your needs.We stock a vast range of seadoo and jet ski parts and seadoo and jet ski accessories

For our factory trained engineers, there is no job too big (or small).

 

JET SKI HISTORY

When snowmobile manufacturer Bombardier Inc. introduced the SEA-DOO in 1968, the idea of a motor-driven consumer watercraft with no visible propeller was revolutionary. The idea of passengers standing on a watercraft instead of sitting in a conventional hull was also pretty out there. In fact, the design turned out to be too original. Bombardier's new product was not successful, and the company discontinued it in 1970.

A few years later, Kawasaki Motors introduced the JET SKI watercraft, which became so popular that many people now refer to all personal watercraft as a jet ski . In the mid-1980s, other manufacturers developed their own Jet ski models, and Bombardier re-introduced its SEADOO design of jet ski.

Since then, demand for personal watercraft has sky-rocketed. There were 1.48 million personal watercraft registered with the U.S. Coast Guard in 2004. About 28.7 million people rode personal watercraft in U.S. waters in the same year


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