Low frequency
From Wikipedia, the free encyclopedia.

Low Frequency or LF (sometimes called longwave) refers to Radio Frequencies (RF) in the range of 30-300 kHz. In Europe, part of the LF spectrum is used for AM broadcast service. In the western hemisphere, its main use is for aircraft beacon, navigation, information, and weather systems.

The original article can be found at: http://en.wikipedia.org/wiki/Low_frequency.
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