| 词条 | Ffestiniog transmitting station | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
|name = Ffestiniog |image = |map_name = Wales Gwynedd |coordinates = {{coord|52.934191|-3.921521|type:landmark_region:GB|display=inline,title}} |height2 = {{convert|45|m|ft|0}} |gridref= SH709391 |built = 1969 |demolished = |collapsed = |BBC = BBC Wales (1967-1982) |ITV = HTV Wales }} The Ffestiniog transmitting station is a broadcasting and telecommunications facility located on the slopes of Mynydd Maentwrog about 3 km south of the town of Llan Ffestiniog, in Gwynedd, Wales. It was originally built by the IBA, entering service in early 1969 acting as a BBC and ITV relay transmitter for the now-defunct 405-line VHF television system. SpecificationsThe site has a self-standing {{convert|45|m|ft|0|abbr=on}} lattice tower erected on land that is itself about 310 m above sea level. The television broadcasts primarily cover the towns of Ffestiniog, Blaenau Ffestiniog and the Vale of Ffestiniog in general. 625-line colour TV came to the site in the late 1970s. The 405-line VHF television service closed across the UK in 1985, but according to the BBC's and ITV's transmitter list[1] and the BBC's internal "Eng. Inf." magazine,[2] Ffestiniog's 405 line services were due to close early - in the third quarter of 1982. Ffestiniog currently broadcasts digital television and analogue FM radio. Services listed by frequencyAnalogue television28 February 1969 - Late 1970sThe start date is for ITV service from the site. It is not clear when the BBC service commenced. The transmitter was classed as a relay of Blaenplwyf about 65 km to the south (for BBC) and as a relay of Preseli about 120 km to the south (for ITV). However, the line-of-sight to Preseli is obstructed about 10 km to the south of Ffestiniog, and it is likely that the signal feed was obtained by off-air reception of Arfon about 25 km to the west, itself a repeater of Preseli.
Late 1970s - Third Quarter 1982Colour TV eventually arrived, with the site now additionally acting as a very indirect relay of Llanddona (about 30 km to the north) for the 625-line services, receiving its signal off-air from Llandecwyn, itself receiving a signal off-air from Arfon, which received its signal off-air from Llanddona itself.
Third Quarter 1982 - 21 October 2009Channel 4 launched across the UK on 1 November 1982. Being in Wales, Ffestiniog broadcast the S4C variant. 405-line television was discontinued (after a mere 13 years) at about the same time as this new service started up. For the next 27 years there were to be no changes to the television output at this site.
Analogue and Digital Television21 October 2009 - 18 November 2009Digital switchover started at Llanddona and therefore at Ffestiniog and all its other relays. BBC 2 was closed down on channel 28 and ITV 1 was moved from channel 25 to channel 28 for its final three weeks of service. Mux A started up on the newly vacated channel 25 at full post-DSO power.
Digital Television18 November 2009- presentAll the remaining analogue TV transmitters were shut down and the three multiplexes of Freeview Lite took over their frequencies, leaving channel 32 unused for now.
Analogue radio (FM VHF)14 December 1992 - January 2012For its FM radio services, Ffestiniog acts as an off-air relay of Blaenplwyf.
See also
References1. ^{{cite web|url=http://www.pembers.freeserve.co.uk/405-Lines/Transmitters.gif |title=Archived copy |accessdate=2013-11-15 |deadurl=yes |archiveurl=https://web.archive.org/web/20120813054041/http://www.pembers.freeserve.co.uk/405-Lines/Transmitters.gif |archivedate=2012-08-13 |df= }} 2. ^http://www.bbceng.info/Eng_Inf/EngInf_4.pdf External links
3 : Buildings and structures in Gwynedd|Transmitter sites in Wales|Maentwrog |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。