“St Dogmaels television relay station”的意思、由来-开放百科全书

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St Dogmaels television relay station

释义

Services listed by frequency
Analogue television Early 1978 - 1 November 1982 1 November 1982 - 19 August 2009 Analogue and digital television 19 August 2009 - 16 September 2009 Digital television 16 September 2009 - present
See also
References
External links

{{unreferenced|date=February 2012}}{{Infobox UK transmitter
|name = St Dogmaels
|image =
|map = {{Location map+
| Wales Pembrokeshire
| width = 250
| float = center
| caption =
| places ={{Location map~
| Wales Pembrokeshire
| label = St Dogmaels
| position =
| mark =
| coordinates = {{coord|52.075142|-4.678286|type:landmark_region:GB|display=inline}}

}}{{Location map~

| Wales Pembrokeshire
| label = Preseli
| position =
| mark = Green pog.svg
| coordinates = {{coord|51.944444|-4.661111|type:landmark_region:GB|display=inline}}
}}
}}
|height = {{convert|25|m|ft|0}}
|gridref=
|built = 1978
|demolished =
|collapsed =
|relay = Preseli
|BBC = BBC Wales
|ITV = ITV Wales
}}

The St Dogmaels television relay station is a broadcasting and telecommunications facility located just above the village of St Dogmaels in Pembrokeshire, Wales, about 2 km to the south west of the town of Cardigan, in neighbouring Ceredigion({{gbmapping|SN165452}}). It was originally built by the IBA as a 625-line analogue UHF television relay, entering service in early 1978. Since then it has been converted to transmit the main three multiplexes of the DVB-T digital television system.

The builders of this UHF relay chose not to re-use a nearby existing site with a {{convert|45|m|ft|0}} lattice tower built by the BBC in 1967 as a relay for the 405-line VHF TV system. This despite it being only about 1.5 km to the south west and on higher ground.

The site has a self-standing tower erected on land that is itself about 100 m above sea level. The television broadcasts primarily cover St Dogmaels itself plus the town of Cardigan and the upper estuary of the Teifi river.

The transmissions from this relay come off-air from the Preseli transmitter about 20 km to the south.

Services listed by frequency

Analogue television

Early 1978 - 1 November 1982

At the time this relay was built, the UK only had three UHF networks.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=23}}	23	0.015	HTV Wales
ch=26}}	26	0.015	BBC2 Wales
ch=33}}	33	0.015	BBC1 Wales

1 November 1982 - 19 August 2009

The new Channel 4 network arrived in 1982. Being in Wales, St Dogmaels carried the Welsh variant S4C.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service
ch=23}}	23	0.015	ITV1 Wales (HTV Wales until 2002)
ch=26}}	26	0.015	BBC Two Wales
ch=29}}	29	0.015	S4C
ch=33}}	33	0.015	BBC One Wales

Analogue and digital television

19 August 2009 - 16 September 2009

The digital switchover started on this relay's parent transmitter at Preseli. BBC Two Wales was shut down. ITV1 Wales moved to the old BBC Two Wales frequency, freeing up channel 23 which then became this site's first digital transmission.

{{no2Frequency	{{no2UHF	{{no2kW	{{no2Service	{{no2System
ch=23}}	23	0.003	BBC A	DVB-T
ch=26}}	26	0.015	ITV1 Wales	PAL System I
ch=29}}	29	0.015	S4C	PAL System I
ch=33}}	33	0.015	BBC One Wales	PAL System I

Digital television

16 September 2009 - present

With the completion of the digital switchover at Preseli on 16 September, all analogue television from this site ceased forever. The site now only delivers DVB-T digital television.

Frequency	UHF	kW	Operator
ch=23}}	23	0.003	BBC A
ch=26}}	26	0.003	Digital 3&4
ch=29}}	29	0.003	BBC B

References

External links

The Transmission Gallery: Photographs and Information

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

2 : Buildings and structures in Pembrokeshire|Transmitter sites in Wales

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