Tag Archives :range

Recreational marine VHF antennas are usually broken down into three categories: 3- or 4-foot sailboat antennas (3dB gain), 8-foot powerboat antennas (6 dB gain) and 16-plus-foot, long-stick antennas (9+ dB gain). The antenna gain is a ratio related to an antennas effective radiated power (ERP) instead of a fixed quantity value.  ...

Radio travels as waves… similar to light, and like light, it can be reflected, reduced, or even stopped by other objects. A popular answer is 'line of sight’ which essentially means 'if you can see it, you can talk to it'. This is generally a good guide. You must remember that the radio signal comes from the radio aerial (not the radio itself) and therefore mounting the antenna higher allows the radio to 'see' further.  ...

VHF communication range depends mainly on the height of the antennas of the transmitting and receiving stations. By using VHF marine repeater stations, the range of ship to ship, ship to shore and shore to ship communications can be significantly increased. VHF marine repeaters are unmanned shore installations usually located at geographically high points. They are designed to transmit and receive simultaneously and will retransmit, or ‘repeat’ all signals received.  ...

VHF radio lets boaters have two-way contact with other vessels, rescue services, and anyone else using VHF radios. While they used to be a one-size-fits-all product, these days they have a range of extra features that may better suit your requirements. Here are the features you can choose from at your next marine radio installation.  ...

Certificate held by Masters, Deck Officers or other shipboard personnel who perform radiocommunication duties on ships fitted with GMDSS equipment. Requires detailed practical knowledge of operation of all GMDSS sub-systems and equipment, ability to send and receive correctly by radiotelephone and narrow band direct printing (telex). Examined to the European Radiocommunication Committee (ERC) Decision ERC/DEC/(99)01, as amended, which is based on the harmonised syllabi developed by the  ...