Airplanes regularly communicate their position and other data.Wireless and coded in a sort of short message. Beacause of its large height, a scanner easily makes this signal audible. The primary frequency in Europe is 131.725 MHz. (N-America 131.550 MHz, Pacific/Asia 131.550 MHz and Japan 131.450 MHz).
Examples of the ACARS-sound are atwww.wunclub.com/sounds/index: (Wav-file 180k)
Often the term WACARS is used. Wacars refers to a Windows-program that decodes ACARS through a soundcard.
Comments are welcome.
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Last changed: 14-12-2000
© 2000 Jan, pe1rym