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  2. VHF omnidirectional range - Wikipedia

    en.wikipedia.org/wiki/VHF_omnidirectional_range

    DVOR (Doppler VOR) ground station, collocated with DME. On-board VOR display with CDI MCT DVOR, Manchester Airport, United Kingdom.. Very High Frequency Omnidirectional Range Station (VOR) [1] is a type of short-range VHF radio navigation system for aircraft, enabling aircraft with a VOR receiver to determine the azimuth (also radial), referenced to magnetic north, between the aircraft to/from ...

  3. Marker beacon - Wikipedia

    en.wikipedia.org/wiki/Marker_beacon

    Its antenna is highly directional, and is pointed straight up. The valid signal area is a 2,400 ft (730 m) × 4,200 ft (1,280 m) ellipse (as measured 1,000 ft (300 m) above the antenna.) When the aircraft passes over the outer marker antenna, its marker beacon receiver detects the signal.

  4. Cessna 172 - Wikipedia

    en.wikipedia.org/wiki/Cessna_172

    The Cessna 172 Skyhawk is an American four-seat, single-engine, high wing, fixed-wing aircraft made by the Cessna Aircraft Company. [2] First flown in 1955, [2] more 172s have been built than any other aircraft. [3] It was developed from the 1948 Cessna 170 but with tricycle landing gear rather than conventional landing gear.

  5. VOR/DME - Wikipedia

    en.wikipedia.org/wiki/VOR/DME

    A VOR/DME ground station in Germany In radio navigation , a VOR/DME is a radio beacon that combines a VHF omnidirectional range (VOR) with a distance-measuring equipment (DME). [ 1 ] The VOR allows the receiver to measure its bearing to or from the beacon, while the DME provides the slant distance between the receiver and the station.

  6. Aircraft emergency frequency - Wikipedia

    en.wikipedia.org/wiki/Aircraft_emergency_frequency

    The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...

  7. Low-frequency radio range - Wikipedia

    en.wikipedia.org/wiki/Low-frequency_radio_range

    Low-frequency radio range audio signals: N stream, A stream and combined uniform tone (simulated sounds) The low-frequency radio range, also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly "the range", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF ...

  8. Tactical air navigation system - Wikipedia

    en.wikipedia.org/wiki/Tactical_air_navigation_system

    Typical US Air Force TACAN site using a dB Systems Model 900E TACAN Antenna. A tactical air navigation system, commonly referred to by the acronym TACAN, is a navigation system initially designed for naval aircraft to acquire moving landing platforms (i.e., ships) and later expanded for use by other military aircraft.

  9. Direction finding - Wikipedia

    en.wikipedia.org/wiki/Automatic_Direction_Finder

    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 ...