Radio VHF kalautan: Béda antarrépisi

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'''Radio VHF kalautan''' dipasang dina sakabéh kapal balayar badag sarta kapal leutik di sagara. Hal ieu ogé dipaké, jeung aturan anu saeutik béda, di walungan sarta danau. Hal ieu dipaké pikeun sagala rupa tujuan, kaasup ngagero layanan [[kasalametan]] sarta komunikasi jeung [[palabuhan]], [[Lock (water transport)|locks]], [[rohang nakoda]]s and [[marina]]s, sarta operasi dina kisaran [[very high frequency]] (VHF) , antara 156 and 162.025 [[Megahertz|MHz]]. Sanajan loba dipaké pikeun nyingkahan tabrakan, pamakéanana pikeun tujuan anu kontroversial sarta pohara nguciwakeun sawatara nagara, kaasup Inggris.<ref name= "UK Marine">UK Maritime and Coastguard Agency Marine Guidance Note MGN324</ref>
 
{{Tarjamahkeun|Inggris}}
 
A marine VHF set is a combined transmitter and receiver and only operates on standard, international frequencies known as [[channel (communications)|channels]]. '''Channel 16''' (156.8&nbsp;MHz) is the international calling and distress channel. '''Channel 9''' can also be used in some places as a secondary call and distress channel. Transmission power ranges between 1 and 25 watts, giving a [[line-of-sight propagation|maximum range]] of up to about 60 [[nautical mile]]s (111&nbsp;km) between [[Antenna (radio)|aerial]]s mounted on tall ships and hills, and {{convert|5|nmi|0}} between aerials mounted on small [[boat]]s at sea level.<ref name= "UK Marine" /> [[Frequency modulation]] (FM) is used, with vertical polarization, meaning that antennas have to be vertical in order to have good reception.