marker beacon


marker beacon
The beacons serve to identify a particular location in space along an airway or an approach to an instrument runway. This is done by means of a 75 MHz transmitter, which transmits a directional signal to aircraft flying overhead. These markers generally are used in conjunction with en route navigational aids and an ILS (instrument landing system) as point designators. The three types of en route markers are fan markers (FM), low-powered fan markers (LFM), and Z markers. They transmit the letter R (.-.) as identification, or if additional markers are in the same area, the letters K, P, X, or Z. Class FMs provide positive identification of positions at definite points along the airway and have a power output of 100 watts. Class LFMs have a rated output of 5 watts, and their antenna arrays produce a circular pattern that appears elongated at right angles to the runway because of the directional characteristics of aircraft receiving the antenna. The station-location, or Z, marker gives a positive position for aircraft operating under instrument flight conditions to show the pilots when they are passing directly over a low-frequency navigational aid. There are three marker beacons: the outer marker, which is sited 4 to 5 NM from the touchdown and transmits two low-pitched dashes per s; the middle marker, which is located 1/4 to 1/2 NM from the touchdown and transmits high-pitched dots and dashes alternately; and the inner marker, which is located at the runway threshold and transmits six high-pitched dots per second. Normally, the inner marker is not installed. The signals from the marker are beamed vertically upward in a fan shape and can be heard in the aircraft only when it is directly above the beacons.
When the aircraft flies over outer, middle, and inner markers, light in color code indicated above flashes. The frequency of audio tone is also indicated in the illustration.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Marker beacon — A marker beacon is a particular type of VHF radio beacon used in aviation, usually in conjunction with an instrument landing system (ILS), to give pilots a means to determine position along an established route to a destination such as a runway.… …   Wikipedia

  • marker beacon — noun see marker 3b …   Useful english dictionary

  • radio-marker beacon — The beacons that serve to identify a particular location in space along an airway or approach to an instrument runway. This is done by means of a 75 MHz transmitter, which transmits a directional signal to be received by aircraft flying overhead …   Aviation dictionary

  • Z-marker beacon — Z radijo švyturys statusas T sritis Gynyba apibrėžtis Radijo švyturys, kurio spinduliai yra skleidžiami vertikalaus kūgio pavidalo. atitikmenys: angl. Z marker beacon pranc. radioborne Z ryšiai: dar žiūrėk – tylos zona dar žiūrėk – vėduokliškas… …   NATO terminų aiškinamasis žodynas

  • fan marker beacon — vėduokliškas žymimasis radijo spindulys statusas T sritis Gynyba apibrėžtis Radijo spindulys, kurio radijo signalai sklinda sudarydami vėduoklės formas. Signalas gali būti užkoduotas atpažinimo tikslais. atitikmenys: angl. fan marker beacon pranc …   NATO terminų aiškinamasis žodynas

  • fan marker beacon — A type of radio beacon, the emissions of which radiate in a vertical, fan shaped pattern. The signal can be keyed for identification purposes. See also radio beacon …   Military dictionary

  • Z-marker beacon — Transmitter equipment installed as part of a four course radio range. It radiates vertically to indicate to aircraft when they pass directly over the range station; it is usually not keyed for identification. Range stations and Z markers are… …   Aviation dictionary

  • Marker — may refer to: Marker (linguistics), a morpheme that indicates some grammatical function Marker (telecommunications), a special purpose computer A set of sewing patterns tightly arranged within a rectangle that is placed over cloth to be cut… …   Wikipedia

  • beacon — Synonyms and related words: AM transmitter, FM transmitter, Klaxon, Mayday, RT transmitter, Roman candle, SOS, Texas tower, Very flare, aid to navigation, air raid alarm, airport beacon, airway beacon, alarm, alarm bell, alarm clock, alarm signal …   Moby Thesaurus

  • marker — Synonyms and related words: accountant, amanuensis, arch, archivist, barrow, beacon, beam, bench mark, bookkeeper, bookmark, boundary stone, brass, bust, cairn, catstone, cenotaph, clerk, column, cromlech, cross, cup, cyclolith, documentalist,… …   Moby Thesaurus


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