nondirectional beacon

A radio navigational aid that enables the pilot to obtain his bearing from a transmitting station. A transmitter operating in long- or medium-wave frequencies, or even in UHFs (ultrahigh frequencies), with the code of the station superimposed on its transmitted signal. The signal indicates a bearing or homing and is picked up by the radio compass or ADF (automatic direction finder) in the aircraft. NDB facilities normally operate in the frequency band of 190 to 535 kHz and usually transmit a continuous carrier with either 400 or 1020 Hz modulation. When used in conjunction with ILS (instrument landing system) markers, they are called compass locators. The aircraft equipment can also lock onto other transmitters like radio broadcasting stations for this purpose. All radio beacons except compass locators transmit repetitive continuous three-letter identification signals except during voice transmissions. The availability of this facility is indicated on aeronautical charts by symbols .

Aviation dictionary. 2014.

Look at other dictionaries:

  • nondirectional — “+ adjective : not directional : omnidirectional a nondirectional beacon …   Useful english dictionary

  • radio beacon — Fixed ground stations emitting RF (radio frequency) signals, especially those containing identification signals such as NDBs (nondirectional beacons), which enable aircraft to fix their position relative to them. These facilities normally operate …   Aviation dictionary

  • NDB — nondirectional beacon …   Military dictionary

  • NDB letdown — A nonprecision approach carried out with the help of an NDB (nondirectional beacon). The aircraft homes to the beacon and arrives overhead. It turns outbound and flies level for a specific period of time, depending upon the altitude, after which… …   Aviation dictionary

  • NDB — Non Directional Beacon (Governmental » Transportation) * Network DataBase (Computing » File Extensions) * National Discount Broker (Academic & Science » Chemistry) * Nondirectional Beacon (Governmental » Transportation) * Nouadhibou, Mauritania… …   Abbreviations dictionary

  • locator — i. An MF/LF (medium frequency/low frequency) nondirectional beacon used as an aid to final approach. ii. A portable radio beacon, operating on 121.5/243/ 406 MHz, carried on the person or in a parachute harness. It may also have a voice facility …   Aviation dictionary

  • NDB — Neue Deutsche Biografie. * * * NDB   [endiː biː, Abkürzung für englisch nondirectional beacon], ein ungerichtetes Funkfeuer (Kreisfunkfeuer). * * * NDB = Neue Deutsche Biographie …   Universal-Lexikon

  • NDB — • Network Debugger • NonDirectional Beacon • Nouadhibou, Mauritania internationale Flughafen Kennung …   Acronyms

  • NDB — [1] Network Debugger [2] NonDirectional Beacon [3] Nouadhibou, Mauritania internationale Fughafen Kennung …   Acronyms von A bis Z

  • automatic direction finder — Equipment to determine the direction from which an electromagnetic signal is being generated. It can either be airborne or ground based equipment. It operates in medium or low frequencies, consists of basically a loop aerial, and gives the null… …   Aviation dictionary

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