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radio beacon
Longman Dictionary of Contemporary English
radio beacon
noun
EXAMPLES FROM CORPUS
▪ Following the crash the airliner's emergency radio beacon failed to function and rescue teams experienced difficulties locating the wreckage.
▪ The airport has no radar nor instrument landing system and planes are guided in by radio beacon.
▪ Then the pilots apparently selected a heading toward another radio beacon near the threshold of runway 19.
The Collaborative International Dictionary
radio beacon

Beacon \Bea"con\ (b[=e]"k'n), n. [OE. bekene, AS. be['a]cen, b[=e]cen; akin to OS. b[=o]kan, Fries. baken, beken, sign, signal, D. baak, OHG. bouhhan, G. bake; of unknown origin. Cf. Beckon.]

  1. A signal fire to notify of the approach of an enemy, or to give any notice, commonly of warning.

    No flaming beacons cast their blaze afar.
    --Gay.

  2. A signal, such as that from a lighthouse, or a conspicuous mark erected on an eminence near the shore, or moored in shoal water, as a guide to mariners.

  3. A high hill near the shore. [Prov. Eng.]

  4. That which gives notice of danger.

    Modest doubt is called The beacon of the wise.
    --Shak.

  5. (Navigation) a radio transmitter which emits a characteristic signal indication its location, so that vehicles may determine their exact location by locating the beacon with a radio compass; -- also called radio beacon.

    5. [fig.] that which provides guidance or inspiration; the Constitution has been a beacon for civil rights activists.

    Beacon fire, a signal fire.

Wiktionary
radio beacon

n. (context communication English) A beacon that emits radio wave signals to guide ships or aircraft or to indicate their positions.

WordNet
radio beacon
  1. n. a characteristic signal emitted by a transmitter used for navigation

  2. a radio station that broadcasts a directional signal for navigational purposes [syn: beacon]

Usage examples of "radio beacon".

We could stop broadcasting the Message and use our radio beacon to beam a warning.

An automatic radio beacon signals your position at regular intervals, and in the extremely improbable event of a complete power failure, a dust-ski from Port Roris would tow you home with little delay.

Each of the radio beacon buoys costs $1,800, and there are six of them on a longline.

If you could come up for a D/F from the radio beacon, it would help.