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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 ...
156–158 MHz VHF Marine Radio. 156.8 MHz (Channel 16) is the maritime emergency and contact frequency. 159.81-161.565 MHz railways [b] 159.81–160.2 are railroads in Canada only and are used by trucking companies in the U.S. 160.6–162 Wireless microphones and TV/FM broadcast remote pickup
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.
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
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 ...
A typical VHF survival craft transceiver. Very high frequency (VHF) survival craft transceivers (SCTs) are lightweight, portable, two-way, handheld VHF transceivers capable of radiotelephone on-scene communication between rescue units and the survival craft. Essentially these are hand-held VHF radios that are used in any survival craft, such as ...
Antennas are generally sensitive to signals only when they have a length that is a significant portion of the wavelength, or larger. Most antennas are at least 1 ⁄ 4 of the wavelength, more commonly 1 ⁄ 2 – the half-wave dipole is a very common design. For longwave use, this resulted in loop antennas tens of feet on a side, often with ...
An inverted vee antenna is a type of antenna similar to a horizontal dipole, but with the two sides bent down towards the ground, typically creating a 120- or 90-degree angle between the dipole legs. It is typically used in areas of limited space as it can significantly reduce the ground foot print of the antenna without significantly impacting ...