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 Foyle Radio nan Gàidheal in Scotland and by BBC Radio Cymru in Wales). It was not initially available on DAB digital radio, however; the Northern Ireland multiplex licence only requires carriage of Radio Ulster. In June 2010, the BBC announced a trial scheme under which Radio Foyle would be available on DAB as a part-time sidecar station to Radio Ulster, using a similar format as the part-time longwave-programming optouts of BBC Radio 4 on the BBC National DAB multiplex. During this trial, the bitrate of Radio Ulster would drop during Foyle's separate broadcast hours, with Foyle carried as a split audio