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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 ...
These antenna configurations are more common on merchant ships. A handheld amateur VHF radio transceiver ready for "maritime mobile" use on a 28' yacht. For VHF and UHF operation, one option is to mount a small Yagi antenna to a pole 1–2 m (3–6 ft) long and haul this to the masthead using a flag halyard. If the halyard is correctly knotted ...
The VHF band is the first band at which efficient transmitting antennas are small enough that they can be mounted on vehicles and portable devices, so the band is used for two-way land mobile radio systems, such as walkie-talkies, and two way radio communication with aircraft and ships (marine radio).
Coast Guard Auxiliary stations are privately owned stations that have been offered for use of the Government and have been approved by the Coast Guard. They may be on the marine VHF band or use HF communications. In addition, many Coast Guard Auxiliarists are qualified radio watchstanders at existing Coast Guard stations.
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.
Slotted array UHF television broadcasting antenna. As shown by H. G. Booker in 1946, from Babinet's principle in optics a slot in a metal plate or waveguide has the same radiation pattern as a driven rod antenna whose rod is the same shape as the slot, with the exception that the electric field and magnetic field directions are interchanged; the antenna is a magnetic dipole instead of an ...