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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 ...
A Marine Corps 2ndLt operates a PRC 119 during training in Quantico, Virginia. November 1983: ITT Corporation (ITT) wins the contract for the first type of radio, for ground troops. May 1985: ITT wins the contract for the airborne SINCGARS. May-June 1988: 4th Bn, 31st Infantry begins initial field tests of the SINCGARS radio at Fort Sill
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 ...
Linear slot antennas emit narrow fan-shaped beams. Used as UHF broadcast antennas and marine radar antennas. Lens A lens antenna is made from a layer of dielectric, or a metal screen, or multiple waveguide structure of varying thickness, mounted in front of a feed antenna.
Land mobile radio systems use channels in the VHF or UHF bands, since the antennas used at these short wavelengths are small enough to mount on vehicles or handheld transceivers. Transmitter power is usually limited to a few watts, to provide a reliable working range on the order of 3 to 20 miles (4.8 to 32 km) depending on terrain.
Marine VHF radio channels 15/16 – these channels are used only on the obsolete Class C EPIRBs The obsolete Inmarsat-E beacons transmitted to Inmarsat satellites on 1646 MHz UHF. 121.5 MHz VHF ± 6 kHz (frequency band protected to ±50 kHz) [ 66 ] (Satellite detection ceased on 1 February 2009, [ 67 ] but this frequency is still used for short ...