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:Machynlleth transmitting station

{{use dmy dates|date=July 2021}}

{{Infobox UK Transmitter |

|name = Machynlleth

|image =

|map_name = Wales Powys

|coordinates = {{coord|52.586845|-3.884144|type:landmark_region:GB|display=inline,title}}

|height2 = {{convert|30|m|ft|0}}

|gridref= SH724004

|built = 1965

|demolished =

|collapsed =

|BBC = BBC Wales (1967-1982)

}}

The Machynlleth transmitting station is a broadcasting and telecommunications facility located on a hill about {{convert|2.5|km|mi}} west of the town of Machynlleth, in Powys, Wales. It was originally built by the BBC,{{cite web|url=http://downloads.bbc.co.uk/rd/pubs/reports/1965-28.pdf|title=TRANSMITTING AERIALS FOR THE MACHYNLLETH V.H.F. TELEVISION AND V.H.F. SOUND STATION - Technological Report No. E-114/10|website=BBC|date=August 1965}} entering service in June 1965 acting as a relay transmitter for the now-defunct 405-line VHF television system.

Specifications

The site originally consisted of a pair of {{convert|14|m|ft}} wooden telegraph poles (one for the transmitting aerials, one for the receiving aerials) erected on land that is itself about {{convert|92|m|ft}} above sea level. The television broadcasts primarily covered the town of Machynlleth and the villages of the upper Dyfi river valley.

625-line colour TV came to the site in the late 1970s. A new {{convert|30|m|ft}} self-supporting lattice mast was built to carry the UHF aerials but the original VHF TV and VHF radio services continued to use the site's original wooden poles.

The three original VHF radio transmitters were upgraded to stereo in late Spring 1983.{{Cite web |url=http://www.bbceng.info/Eng_Inf/EngInf_13.pdf |title=Archived copy |access-date=2012-06-12 |archive-url=https://web.archive.org/web/20090106035542/http://www.bbceng.info/Eng_Inf/EngInf_13.pdf |archive-date=2009-01-06 |url-status=dead |website=bbceng.info}}

The 405-line VHF television service closed across the UK in 1985, but Machynlleth's 405 line services closed a year early - in January 1984.

Machynlleth currently broadcasts digital television and analogue FM radio.

Services listed by frequency

=Analogue television=

==28 June 1965 - Late 1970s==

The transmitter was classed as a relay of Blaenplwyf about {{convert|30|km|mi}} to the southwest, receiving its signal by direct off-air pickup.

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}VHF

!{{no2}}kW

!{{no2}}Service

{{UK System A|ch=5}}

|5H

|0.05

|BBC1 Wales

==Late 1970s - 1 November 1982==

Colour TV eventually arrived, with the site continuing to act as an off-air relay of Blaenplwyf for the 625-line services.{{Cite web|url=https://www.freeview.co.uk/corporate/about-us|title=About us|website=www.freeview.co.uk}}

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}VHF

!{{no2}}UHF

!{{no2}}kW

!{{no2}}Service

{{UK System A|ch=5}}

|5H

|—

|0.05

|BBC1 Wales

{{UK System I|ch=57}}

|—

|57

|0.02

|BBC1 Wales

{{UK System I|ch=60}}

|—

|60

|0.02

|HTV Wales

{{UK System I|ch=63}}

|—

|63

|0.02

|BBC2 Wales

==1 November 1982 - January 1984==

Channel 4 launched across the UK on 1 November 1982. Being in Wales, Machynlleth broadcast the S4C variant.

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}VHF

!{{no2}}UHF

!{{no2}}kW

!{{no2}}Service

{{UK System A|ch=5}}

|5H

|—

|0.05

|BBC1 Wales

{{UK System I|ch=53}}

|—

|53

|0.02

|S4C

{{UK System I|ch=57}}

|—

|57

|0.02

|BBC1 Wales

{{UK System I|ch=60}}

|—

|60

|0.02

|HTV Wales

{{UK System I|ch=63}}

|—

|63

|0.02

|BBC2 Wales

==January 1984 - 10 February 2010==

405-line television was discontinued after 19 years of service. For the next 25 years there were to be no changes to the television output at this site.

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}UHF

!{{no2}}kW

!{{no2}}Service

{{UK System I|ch=53}}

|53

|0.02

|S4C

{{UK System I|ch=57}}

|57

|0.02

|BBC1 Wales

{{UK System I|ch=60}}

|60

|0.02

|HTV Wales

{{UK System I|ch=63}}

|63

|0.02

|BBC2 Wales

=Analogue and Digital Television=

==10 February 2010 - 10 March 2010==

Digital switchover started at Blaenplwyf and therefore at Machynlleth and all its other relays. BBC 2 was closed down on channel 63 and BBC 1 was moved from channel 57 to channel 63 for its final month of service. Mux A started up on the newly vacated channel 57 at full post-DSO power of 4 W.

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}UHF

!{{no2}}kW

!{{no2}}Service

!{{no2}}System

{{UK System I|ch=53}}

|53

|0.02

|S4C

|PAL System I

{{UK DVB-T|ch=57}}

|57

|0.004

|BBC Mux A

|DVB-T

{{UK System I|ch=60}}

|60

|0.02

|HTV Wales

|PAL System I

{{UK System I|ch=63}}

|63

|0.02

|BBC1 Wales

|PAL System I

=Digital Television=

==10 March 2010 - present==

All the remaining analogue TV transmitters were shut down and the three multiplexes of Freeview Lite took over their frequencies.

class="wikitable sortable"

!Frequency

!UHF

!kW

!Service

{{UK DVB-T|ch=53}}

|53

|0.004

|BBC Mux B

{{UK DVB-T|ch=57}}

|57

|0.004

|BBC Mux A

{{UK DVB-T|ch=60}}

|60

|0.004

|Digital 3&4

=Analogue radio (FM VHF)=

==28 June 1965 - Early 1990s==

For its FM radio services, Machynlleth is an off-air relay of Blaenplwyf.

class="wikitable sortable"

!{{no2}}Frequency

!{{no2}}kW

!{{no2}}Service

89.4 MHz

|0.06

|BBC Light Programme

91.6 MHz

|0.06

|BBC Third Programme

93.8 MHz

|0.06

|BBC Welsh Home Service

==Early 1990s - present==

Radio 1 gained its own frequency and National Radio 4 was added.

class="wikitable sortable"

!Frequency

!kW

!Service

89.4 MHz

|0.06

|Radio 2

91.6 MHz

|0.06

|Radio 3

93.8 MHz

|0.06

|Radio Cymru

99.0 MHz

|0.06

|Radio 1

103.6 MHz

|0.06

|Radio 4

See also

References

{{Reflist}}

External links

  • [http://tx.mb21.co.uk/info/405/bbc/#bbc_wales MB21's page on BBC 405 TV to Wales and the West]
  • [http://www.bvws.org.uk/405alive/info/tx_list.html 405 Alive's list of transmitters"]
  • [https://web.archive.org/web/20120414222659/http://www.pembers.freeserve.co.uk/405-Lines/tx-list.html#BBC#BBC More details on 405-line BBC transmitters]
  • [http://tx.mb21.co.uk/gallery/machynlleth.php The Transmission Gallery: Photographs and Information]

{{Transmitter sites in Wales}}

{{FM radio transmitter sites in Wales}}

{{Blaenplwyf_VHF_FM_radio_Transmitter_Group}}

{{Blaenplwyf VHF 405-line Transmitter Group}}

{{Blaenplwyf UHF 625-line Transmitter Group}}

{{Blaenplwyf UHF DVB Transmitter Group}}

{{Television transmitters in the UK}}

Category:Buildings and structures in Gwynedd

Category:Transmitter sites in Wales

Category:Pennal