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  • It assists a listener to tune his or her radio to the correct frequency for the station.

  • It informs other stations that the frequency is in use.

  • It serves as a station identifier even if the language used in the subsequent broadcast is not one the listener understands.


The practice began in Europe in the 1920s and 1930s and was carried over into Shortwave broadcasts. The use of interval signals has declined with the advent of digital tuning systems, but has not vanished.


BROADCASTING SERVICES AND INTERVAL SIGNALS



  • BBC World Service in English (occasionally): Lillibullero

  • BBC World Service, non-English, non-Europe: Three even notes tuned B-B-C

  • BBC World Service, non-English, to in Morse Code

  • ''

  • ''

  • '' on chimes

  • '' played on a piano

  • ''

  • ", composed by Ismail Marzuki .

  • Radio Japan (NHK World): ''Kazoe-uta'' ("Counting song")

  • Radio Moscow (former service of the Soviet Union): ''Moscow Nights''

  • 's '' Pictures At An Exhibition ''

  • song "Merck toch hoe sterck"

  • , a distinctive sounding NZ bird species, repeated every 3 minutes

  • RTÉ Radio 1 :''O'Donnell Abú'' {Link without Title}

  • , electronically generated

  • Radio Serbia (former Radio Yugoslavia): ''Yugoslavia, our fight gave birth to you'', a pop version of the famous WW2 revolutionary theme

  • Vatican Radio uses the chimes of the clock in St. Peter's Square , Rome, followed by the Papal fanfare

  • '' played by a brass band



Numbers Stations interval signals

Numbers stations are often named after their interval signals, such as The Lincolnshire Poacher or Magnetic Fields after "Magnetic Fields Part 1" by Jean Michel Jarre .


SOURCES USED



EXTERNAL LINKS

  • [http://www.intervalsignals.net Interval Signals Online]

  • [http://www.irkutsk.com/radio/jingles.htm Irkutsk DX Circle's Interval Signals Collection]

  • [http://www.asahi-net.or.jp/~RP4N-KWMR/bcl/index.html Nobuyuki Kawamura's Interval Signal Library]

  • [http://www.trsc.com/audio.html TRS Consultants' Audio Bytes]

  • Uwe Volk's Sound Library (available both in English and in German )