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 Sheffield transmitters). The Emley Moor transmitter broadcasts DTR for freeview TV channel 734 for Yorkshire, Derbyshire and parts of Lincolnshire on UHF 47-682 MHz the BBCA multiplex. Other local TV transmitters such as Crosspool relay their signal from Emley Moor. The majority of the station's programming is produced and broadcast from Sheffield. During off-peak hours, BBC Radio Sheffield carries regional programming for Yorkshire and the North Midlands from sister station BBC Radio Leeds, which also originates the networked evening shows for BBC Local Radio on weekday evenings (produced independently by Wire Free Productions). During the station's downtime, BBC Radio Sheffield simulcasts