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The Oxford transmitting station (sometimes known as the Beckley transmitter〔http://news.bbc.co.uk/1/hi/england/oxfordshire/8680692.stm〕) is a broadcasting and telecommunications facility, situated on land above Ordnance Datum (mean sea level) to the north east of the city of Oxford, in Oxfordshire, England (). It has a guyed steel lattice mast which is 〔http://tx.mb21.co.uk/info/sitedata/index.asp〕 in height to the top of the main steel structure. Mounted above that are the UHF television antennas, contained within a GRP shroud. These antennas have an average height above Ordnance Datum of .,〔http://www.bbc.co.uk/reception/transmitters/tv/tv_oxford.shtml〕 or above ground level. The total height of the structure is .〔http://www.southoxon.gov.uk/ccm/planning/ApplicationDetails.jsp?REF=P09/W0496〕 It is owned and operated by Arqiva. The effective radiated power of the analogue TV transmissions was 500 kW except for Channel 5 which had an ERP of only 40 kW. This was to avoid causing co-channel interference to other transmissions in surrounding areas.〔http://www.aerialsandtv.com/oxfordtx.html#OxfordsChannels〕 In July 2007 it was confirmed by Ofcom that Oxford would be reverting to a C/D group transmitter at DSO (Digital Switchover). ==History== *The station was originally constructed by the BBC to provide VHF/FM transmissions of the BBC's three national radio networks and one 405-line VHF TV service. The mast carried a two-tier Band I array above a six-tier slot array for Band II FM. A smaller 150 foot tower in the western corner of the site carried receiving aerials.〔http://www.southoxon.gov.uk/ccm/planning/HistoryDetails.jsp?REF=P60/M0403&MAP=NO〕 *The station was extended in 1968, having been chosen as a suitable site for high power colour UHF transmissions, which entered service on 17 February 1968 carrying BBC Two. ITV (ATV/Central) and BBC One followed in June 1970. Channel 4 was carried from launch day in 1982. *In 1997, the station began analogue transmissions of Channel 5. *In 1998, the station began digital transmissions of all six ONdigital multiplexes. *In 1999, the station began analogue transmissions of Oxford's RSL local channel, Six TV on low-power. 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「Oxford transmitting station」の詳細全文を読む スポンサード リンク
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