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 4 programmes, many of which have been broadcast for over 40 years. Most programmes are available for four weeks after broadcast as streaming audio from Radio 4's "listen again" page and via BBC iPlayer. A selection of programmes is also available as podcasts or downloadable audio files. Many comedy and drama programmes from the Radio 4 archives are rebroadcast on BBC Radio 4 Extra (formerly BBC Radio 7). Due to the capacity limitations of DAB and increasing sport broadcasts on BBC Radio 5 Live Sports Extra, BBC Radio 4 DAB has to reduce its bit rate most evenings, such that after