|
The Llanddona transmitting station is a broadcasting and telecommunications facility, situated at Llanddona, near Beaumaris, on the isle of Anglesey, Wales (). It comprises a guyed mast with antennas attached at various heights. It is owned and operated by Arqiva. ==History== The station was built by the BBC in 1958 to provide a 405-line Band I (VHF) TV service and (later) a VHF (FM) radio services for north west Wales, including the Lleyn peninsula, Anglesey and the north Wales coast. ITV's service was provided from the Arfon transmitting station, approximately 20 miles to the south on the mainland. In 1967 the site became the area's main station for 625 line colour UHF TV, starting with just BBC Two in June of that year. By this time, it was policy to co-site all UHF TV services at the same site, and by 1973 Llanddona was broadcasting BBC One, BBC Two and ITV on UHF. S4C was added later in 1982 in time for its launch. Though 405-line TV was discontinued in the UK in 1985, it seems that Llanddona shut down its VHF TV a year early. In the late 1990s, digital TV transmitters were added, carrying all six national multiplexes. In 2006, digital radio transmitters were added for the BBC's national multiplex and also Digital One. On Wednesday 21 October 2009, the Llanddona group of transmitters underwent the first stage of the Digital Switchover and on Wednesday 18 November 2009, analogue television was finally turned off from Llanddona and its group of transmitters as it underwent the second stage of the Digital Switchover. Whilst the old analogue channels were in the UK UHF C/D aerial group, the new DVB channels are now spread over into the E group (presumably to avoid co-channel interference with Winter Hill transmitter), meaning that some customers may need to replace their aerial to get optimum reception. Freeview HD started transmitting using the BBC B multiplex on channel 53 in July 2010. Llanddona was the site of the first TV, VHF radio, digital TV and digital radio broadcasts for the area. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Llanddona transmitting station」の詳細全文を読む スポンサード リンク
|