“Llandyfriog transmitting station”的意思、由来-开放百科全书

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Llandyfriog transmitting station

释义

Services listed by frequency
Analogue television November 4th 1977 - November 1982 November 1982 - November 1997 November 1997 - 19 August 2009 Analogue and digital television 19 August 2009 - 16 September 2009 Digital television 23 September 2009 - present Analogue radio (FM VHF) Winter 1981 - present
See also
References
External links

{{Infobox UK transmitter
|name = Llandyfriog
|image =
|map_name = Wales Ceredigion
|coordinates = {{coord|52.044975|-4.40959|type:landmark_region:GB|display=inline,title}}
|height = {{convert|25|m|ft|0}}
|gridref= SN348412
|built = 1980
|demolished =
|collapsed =
|relay = Preseli
|BBC = BBC Wales
|ITV = ITV Wales
}}

The Llandyfriog transmitting station is a broadcasting and telecommunications facility located on high ground several kilometres east of the town of Newcastle Emlyn, Ceredigion, South Wales. It was built in 1980 to relay VHF radio and UHF television to Newcastle Emlyn and the area in general. The site has a 25 m self-standing lattice mast erected on land that is itself about 105 m above sea level and acts as an off-air television relay of Preseli, about 20 km to the west.

Since Winter 1981^[1] Llandyfriog has transmitted FM radio, acting as an off-air relay of Blaenplwyf about 50 km to the north. In Spring 1983^[2] the radio services were upgraded to stereo.

Currently, Llandyfriog transmitter provides DVB-T digital television to the area, along with FM radio.

Services listed by frequency

Analogue television

November 4th 1977 - November 1982

The station launched with just the original three channels.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=22}}	22	0.11	BBC One Wales
ch=25}}	25	0.11	ITV1 Wales (HTV Wales until 2002)
ch=28}}	28	0.11	BBC Two Wales

November 1982 - November 1997

Being in Wales, when Channel 4 arrived in 1982, Llandyfriog transmitted the S4C variant.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=22}}	22	0.11	BBC One Wales
ch=25}}	25	0.11	ITV1 Wales (HTV Wales until 2002)
ch=28}}	28	0.11	BBC Two Wales
ch=32}}	32	0.11	S4C

November 1997 - 19 August 2009

Llandyfriog was the site of one of the UK's two self-help analogue Channel 5 transmitters.^[3]

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=22}}	22	0.11	BBC One Wales
ch=25}}	25	0.11	ITV1 Wales (HTV Wales until 2002)
ch=28}}	28	0.11	BBC Two Wales
ch=32}}	32	0.11	S4C
ch=35}}	35	0.11	C5

Analogue and digital television

19 August 2009 - 16 September 2009

The UK's digital switchover commenced, mirroring the changes taking place at the parent transmitter at Preseli. Analogue BBC Two Wales closed on channel 28 and ITV1 Wales took over on that frequency for what would be its final 3 weeks of service, vacating channel 25 as it did so. The new digital BBC A multiplex started up at full power in 64-QAM mode on channel 25.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service	{{no2System
ch=22}}	22	0.11	BBC One Wales	PAL System I
ch=25}}	25	0.022	BBC A	DVB-T
ch=28}}	28	0.11	ITV1 Wales	PAL System I
ch=32}}	32	0.11	S4C	PAL System I
ch=35}}	35	0.11	C5	PAL System I

Digital television

23 September 2009 - present

All the analogue television services closed and the new digital multiplexes took over on channels 22 and 28.

Frequency	UHF	kW	Operator
ch=22}}	22	0.022	Digital 3&4
ch=25}}	25	0.022	BBC A
ch=28}}	28	0.022	BBC B

Analogue radio (FM VHF)

Winter 1981 - present

Frequency	kW	Service
90.1 MHz	0.05	BBC Radio 2
92.3 MHz	0.05	BBC Radio 3
94.5 MHz	0.05	BBC Radio Cymru
99.7 MHz	0.05	BBC Radio 1
104.4 MHz	0.05	BBC Radio 4

References

1. ^http://www.bbceng.info/Eng_Inf/EngInf_7.pdf
2. ^http://www.bbceng.info/Eng_Inf/EngInf_13.pdf
3. ^http://stakeholders.ofcom.org.uk/binaries/consultations/selfhelp/summary/selfhelp.pdf (see final page)

External links

The Transmission Gallery: Photographs and Information
The 'ukfree' listing for Llandyfriog

{{Transmitter sites in Wales}}{{FM radio transmitter sites in Wales}}{{Blaenplwyf_VHF_FM_radio_Transmitter_Group}}{{Preseli UHF 625-line Transmitter Group}}{{Preseli UHF DVB Transmitter Group}}{{Television transmitters in the UK}}

1 : Transmitter sites in Wales

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