Greenwich Time Signal Greenwich Time Signal The Greenwich Time Signal (GTS), popularly known as the pips, is a series of six short tones broadcast at one-second intervals by many BBC Radio stations. The pips were introduced in 1924 and have been generated by the BBC since 1990 to mark the precise start of each hour. Their utility in calibration is diminishing as digital broadcasting entails time lags. There are six pips (short beeps) in total, which occur on each of the 5 seconds leading up to the hour and on the hour itself. Each pip is a 1 kHz tone (about halfway between
BBC Radio Manchester the Day". In 1983 and 1984 the radio station ran a series of experimental community stations, each of which used the 1296 kHz AM frequency in turn. The stations were BBC Radio Bury (late 1983/early 1984), BBC Radio Oldham, BBC Radio Rochdale (eight weeks from 14 May 1984), BBC Radio Trafford (which operated from a mobile studio in a school playground) and BBC Radio Wigan (summer 1984). The stations were part-time services which opted out from the main BBC Radio Manchester service. The experiments were never repeated. From October 1988 until 3 April 2006, the station was named BBC GMR