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  2. Automatic Transmitter Identification System (marine) - Wikipedia

    en.wikipedia.org/wiki/Automatic_Transmitter...

    [2]: 44 While DSC transmissions take place exclusively on Channel 70, the ATIS digital signal is transmitted on the same VHF channel as the voice transmission: it lasts for 285 milliseconds after the PTT button has been released, using frequency modulation frequency-shift keying (FSK) between the frequencies of 1,300 Hz and 2,100 Hz at 1,200 baud.

  3. Marine VHF radio - Wikipedia

    en.wikipedia.org/wiki/Marine_VHF_radio

    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 ...

  4. Very high frequency - Wikipedia

    en.wikipedia.org/wiki/Very_high_frequency

    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).

  5. Slot antenna - Wikipedia

    en.wikipedia.org/wiki/Slot_antenna

    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 ...

  6. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    Although no real antenna can be exactly isotropic, a few antennas are built to be as near to isotropic as possible; they are used for emergency backup antennas and for test equipment for other antennas: Because the received and transmitted signal strength is the same in (almost) every direction, they work without any need for them to be any ...

  7. AN/ARC-182 - Wikipedia

    en.wikipedia.org/wiki/AN/ARC-182

    Available accessories include remote controls, transmit power amplifiers, antennas, and ground support equipment. [6] It has been largely replaced by the AN/ARC-210 series in U.S. systems. [ 7 ] The ARC-210 is an improved version of the ARC-182, adding jam-reisistant SINCGARS capability to communicate with Army radios for close air support.