Interesting article in the Giornale della Vela "
WHAT TYPE OF ORDER ARE USED AND WHY?
the VHF radio waves using metric, defined precisely in very high frequency VHF (Very High Frequency) range from 156 to 174 Mhz, whose wavelength is approximately 2 meters. The size of its antenna, approximately half of the wavelength itself, makes communications in VHF ideally suited for all boats, from large passenger vessels up to smaller fishing boats and pleasure yachts. But at sea you take other types of waves, like waves hettometriche in medium frequency (MF), use communications media away from units that are located at 100/200 miles from the coast and the waves decametric, high frequency (HF) used in deep sea, such as the ocean voyages.
WHAT ARE THE ESSENTIAL CHARACTERISTICS OF A VHF RADIO?
All models allow you to filter out background noise through the squelch, which lets you set the receiver sensitivity. On the packaging for each radio will show the power. The value of maximum emissions allowed for equipment for the recreational boating is 25 watts, with the possibility to reduce it to just 1 watt to reduce energy consumption and to communicate at close range.
How far YOU CAN FEEL WITH A RADIO VHF?
At constant output power, the distance at which they can achieve depends on the VHF communications to which the antennas are placed involved. For example, a range of 60 miles can be determined only between one vessel and a coastal station, while two boats, the capacity is reduced to only 15 miles or less when it comes to small boats. Beyond the transmission power of radio equipment in fact, the criterion is especially the curvature of the earth. The scope, which in this case is defined optical exceed the horizon only if the two antennas, however, continue to look at, and be superior to that geographical according to their heights. In these cases, the yachts are undoubtedly benefited from the ability to install the antenna mast, assuming that it is only effective if it operates vertically, and when tilted can lose up to 40% of its performance.
BOARD MAY ALSO BE USED
a mobile device?
For several years, finally in Italy may replace the portable VHF base station on board. The portable radio on board is always more that is useful can make or receive calls while remaining at the helm, keep listening on 16 without having to go below deck and take it with him for various contingencies, including the ill-fated transfer to the liferaft, during the abandonment of the boat.
WHAT ARE THE MAIN DIFFERENCES BETWEEN A PORTABLE MODEL AND A FIXED?
The portable radios are becoming cheaper and morphologically similar to mobile phones. But be warned that even if they can support most of the functions of the fixed models are in fact subject to three fundamental problems:
- a transmission power reduced to only 5 watts (instead of 25) to limit the consumption of rechargeable batteries;
- limited in scope because of the reduced length of the antenna;
- a range of exercise depends on the kind of batteries used and the opportunity to recharge.
For a proper use of a portable model, and above all legalized, it is necessary that each device is registered with the operating license of any fixed equipment on board or providing its own document, entitled the boat on which it is used or held by the user itself, which in turn will be supplied with the certificate of limited radiotelephone.
WHY THE BOAT USING THE CHANNELS AND THE FREQUENCY?
To simplify the use of the equipment, thanks to international agreements, it was agreed to divide the frequency of use in channels. Each is thus a very precise frequency, For example, the channel 16 corresponds to 156.8 mHz.
WHAT DOCUMENTS ARE REQUIRED TO INSTALL
VHF THE BOAT?
first considered a suitable instrument to meet the requirements for distress and safety, commonly in the vhf craft can be used only for emergencies (security) at sea. To access other services such as public correspondence (telephone, fax ...), you need to activate an annual subscription. In contrast, giving up radio conversations that have as their object the safety of navigation, to install and use a VHF radio on board a pleasure craft owner merely observe some essential provisions, which involve only a limited initial financial commitment. equipping of an apparatus of a type that complies with European CE (conformity is declared by the manufacturer) you must have the appropriate operating license by contacting the Harbour Office with which the ' unit was recorded, thus obtaining the number of call sign, which is essential to identify jointly the radio station and the ship that uses it. Instead, the owners of vessels or portable devices, will route the request directly to the Regional Inspectorates of the Ministry of Economic Development, Department of Communications, and also get a personal code that identifies the equipment and its owner.
WHAT IS SHOWN ON THE DISPLAY OF THE RADIO?
addition to the channel number on which you are tuned, some abbreviations, and symbols may appear:
- HI / LO indicates a level of power that is being sent if high (25 W) or low (1W) power
- TX: This means you have the button pressed, and communication is being sent
- BUSY: the receiver is busy with an incoming signal
- INT CAN USA: show the range of channels taken, which may vary depending on the area of navigation. In all the seas surrounding Europe is well aware that the radio is set with the signal INT
- DW / TW: If you communicate enabled Dual Watch (Watch or Trial) which allows you to maintain active listening on one or two service channels without leaving the guard on 16
the VHF radio waves using metric, defined precisely in very high frequency VHF (Very High Frequency) range from 156 to 174 Mhz, whose wavelength is approximately 2 meters. The size of its antenna, approximately half of the wavelength itself, makes communications in VHF ideally suited for all boats, from large passenger vessels up to smaller fishing boats and pleasure yachts. But at sea you take other types of waves, like waves hettometriche in medium frequency (MF), use communications media away from units that are located at 100/200 miles from the coast and the waves decametric, high frequency (HF) used in deep sea, such as the ocean voyages.
WHAT ARE THE ESSENTIAL CHARACTERISTICS OF A VHF RADIO?
All models allow you to filter out background noise through the squelch, which lets you set the receiver sensitivity. On the packaging for each radio will show the power. The value of maximum emissions allowed for equipment for the recreational boating is 25 watts, with the possibility to reduce it to just 1 watt to reduce energy consumption and to communicate at close range.
How far YOU CAN FEEL WITH A RADIO VHF?
At constant output power, the distance at which they can achieve depends on the VHF communications to which the antennas are placed involved. For example, a range of 60 miles can be determined only between one vessel and a coastal station, while two boats, the capacity is reduced to only 15 miles or less when it comes to small boats. Beyond the transmission power of radio equipment in fact, the criterion is especially the curvature of the earth. The scope, which in this case is defined optical exceed the horizon only if the two antennas, however, continue to look at, and be superior to that geographical according to their heights. In these cases, the yachts are undoubtedly benefited from the ability to install the antenna mast, assuming that it is only effective if it operates vertically, and when tilted can lose up to 40% of its performance.
BOARD MAY ALSO BE USED
a mobile device?
For several years, finally in Italy may replace the portable VHF base station on board. The portable radio on board is always more that is useful can make or receive calls while remaining at the helm, keep listening on 16 without having to go below deck and take it with him for various contingencies, including the ill-fated transfer to the liferaft, during the abandonment of the boat.
WHAT ARE THE MAIN DIFFERENCES BETWEEN A PORTABLE MODEL AND A FIXED?
The portable radios are becoming cheaper and morphologically similar to mobile phones. But be warned that even if they can support most of the functions of the fixed models are in fact subject to three fundamental problems:
- a transmission power reduced to only 5 watts (instead of 25) to limit the consumption of rechargeable batteries;
- limited in scope because of the reduced length of the antenna;
- a range of exercise depends on the kind of batteries used and the opportunity to recharge.
For a proper use of a portable model, and above all legalized, it is necessary that each device is registered with the operating license of any fixed equipment on board or providing its own document, entitled the boat on which it is used or held by the user itself, which in turn will be supplied with the certificate of limited radiotelephone.
WHY THE BOAT USING THE CHANNELS AND THE FREQUENCY?
To simplify the use of the equipment, thanks to international agreements, it was agreed to divide the frequency of use in channels. Each is thus a very precise frequency, For example, the channel 16 corresponds to 156.8 mHz.
WHAT DOCUMENTS ARE REQUIRED TO INSTALL
VHF THE BOAT?
first considered a suitable instrument to meet the requirements for distress and safety, commonly in the vhf craft can be used only for emergencies (security) at sea. To access other services such as public correspondence (telephone, fax ...), you need to activate an annual subscription. In contrast, giving up radio conversations that have as their object the safety of navigation, to install and use a VHF radio on board a pleasure craft owner merely observe some essential provisions, which involve only a limited initial financial commitment. equipping of an apparatus of a type that complies with European CE (conformity is declared by the manufacturer) you must have the appropriate operating license by contacting the Harbour Office with which the ' unit was recorded, thus obtaining the number of call sign, which is essential to identify jointly the radio station and the ship that uses it. Instead, the owners of vessels or portable devices, will route the request directly to the Regional Inspectorates of the Ministry of Economic Development, Department of Communications, and also get a personal code that identifies the equipment and its owner.
WHAT IS SHOWN ON THE DISPLAY OF THE RADIO?
addition to the channel number on which you are tuned, some abbreviations, and symbols may appear:
- HI / LO indicates a level of power that is being sent if high (25 W) or low (1W) power
- TX: This means you have the button pressed, and communication is being sent
- BUSY: the receiver is busy with an incoming signal
- INT CAN USA: show the range of channels taken, which may vary depending on the area of navigation. In all the seas surrounding Europe is well aware that the radio is set with the signal INT
- DW / TW: If you communicate enabled Dual Watch (Watch or Trial) which allows you to maintain active listening on one or two service channels without leaving the guard on 16
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