nondirectional beacon

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nondirectional beacon

[¦nän·di′rek·shən·əl ′bē·kən]
(navigation)
A beacon that provides navigational guidance over a 360° azimuth.

nondirectional beacon (NDB)

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 imageimage.
References in periodicals archive ?
Next-generation avionics that are capable of handling more air traffic and a shift toward non-directional beacon (NDB) radio transmitters are the major trends in the market.
But it does have two other systems that many other airports use worldwide - a high frequency directional radio system that pilots use to navigate their aircraft, and a non-directional beacon that also helps guide planes into the airport.
Noise Preferential Routes (NPRs) Width of flight corridor Non-Directional Beacon (NDBs) approaches Potential increase in night flights The impact of the longer runway will be that planes will be lower in the sky at Balsall Common during both take off and landing and will be larger ( that being the purpose of the extension to the runway).
We also needed to confirm the airport would be open, and the airport lights and non-directional beacon were working.
The airstrip, which does not have a manned control tower, is served by a non-directional beacon.
There is only a non-directional beacon which gives pilots a bearing on where the airport is.
It will ultimately replace several navigation aids including Non-Directional Beacon (NDB), Omega, Very High- Frequency Omnidirectional Ranges (VOR), Instrument Landing System (ILS) and Distance Measuring Equipment (DME) at significant costs savings to the federal government.
We also have been awarded a contract for the Siam Reap airport in Cambodia that includes a Doppler very high frequency omni-range ("DVOR")/DME system, a non-directional beacon ("NBD") and tower as well as related communications equipment.
Based in Brisbane, the service inspects navigational equipment such as ground based augmentation systems, distance measuring equipment, non-directional beacons and instrument landing systems.
The navigational aids include 19 instrument landing systems, ten very high omni-directional radio ranges, ten distance measuring devices and ten non-directional beacons according to Xinhua.
Based in Brisbane, the service will carry out inspections on navigational equipment including ground based augmentation systems, distance measuring equipment, non-directional beacons and instrument landing systems at: