Carmarthen transmitting station

Carmarthen
Tower height 37 metres (121 ft)
Coordinates 51°52′05″N 4°18′26″W / 51.8681°N 4.3071°W / 51.8681; -4.3071Coordinates: 51°52′05″N 4°18′26″W / 51.8681°N 4.3071°W / 51.8681; -4.3071
Grid reference SN412213
Built 1964/65
Relay of Wenvoe
BBC region BBC Wales

The Carmarthen transmitting station was originally built by the BBC[1] in 1964/65 as a relay for VHF radio and VHF television. The site was built on a 135 m ridge to the north of Carmarthen itself, and entered service on 15 March 1965. The transmission station is now owned and operated by Arqiva.

UHF 625-line colour television was never radiated from this site: the main transmitter at Carmel (20 km to the east) provided that service to the town from 1973 when it opened.

The 405-line VHF television service closed across the UK in 1985, but according to the BBC's transmitter list[2] and the BBC's internal "Eng. Inf." magazine,[3] Carmarthen was due to close early - in the first quarter of 1982. From that point onwards the site just relayed FM radio until 6 June 2011[4] when a single multiplex of DAB radio was added.

Channels listed by frequency

Analogue television

15 March 1965 - First Quarter 1982

The site provided BBC 405-line VHF television to the towns of Carmarthen and Abergwili which, being sited in a river estuary, could not reliably receive a signal from Wenvoe, 85 km to the east.

Frequency VHF kW Service
45.00 MHz 1 0.013 BBC1 Wales

Analogue radio (VHF FM)

15 March 1965 - January 1973

According to the BBC's R&D report,[1] the original frequencies for the FM radio services were as shown below.

Frequency kW Service
88.5 MHz 0.0065 BBC Light Programme
90.7 MHz 0.0065 BBC Third Programme
92.9 MHz 0.0065 BBC Welsh Home Service

January 1973 - May 1978

The three original radio services were still on their original frequencies as late as January 1973,[5] but ERPs had been slightly increased to 10 W per channel by then. By May 1978 all three transmission frequencies had been moved by 400 kHz [6] and all three were transmitting in stereo by that time.

Frequency kW Service
88.5 MHz -> 88.9 MHz 0.01 BBC Radio 2
90.7 MHz -> 91.1 MHz 0.01 BBC Radio 3
92.9 MHz -> 93.3 MHz 0.01 BBC Radio 4†

† Radio 4 was replaced by BBC Radio Cymru when it launched in January 1977.

May 1978 - Late 1980s

The new frequency plan continued unchanged until Radio 1 gained its own frequency.

Frequency kW Service
88.9 MHz 0.01 BBC Radio 2
91.1 MHz 0.01 BBC Radio 3
93.3 MHz 0.01 BBC Radio Cymru

Late 1980s - present

Radio 1 was given its own frequency as more of Band II became available for broadcasting after the bandplan changes of 1988.

Frequency kW Service
88.9 MHz 0.01 BBC Radio 2
91.1 MHz 0.01 BBC Radio 3
93.3 MHz 0.01 BBC Radio Cymru
95.5 MHz 0.01 BBC Radio 4
97.5 MHz 0.01 Radio Carmarthenshire
98.5 MHz 0.01 BBC Radio 1
106.0 MHz 0.02 Real Radio (Wales)

Digital radio (DAB)

6 June 2011 - present

Frequency Block kW Operator
225.648 MHz 12B 0.6 BBC National DAB

References

  1. 1 2 http://downloads.bbc.co.uk/rd/pubs/reports/1965-10.pdf
  2. ↑ http://www.pembers.freeserve.co.uk/405-Lines/Transmitters.gif
  3. ↑ http://www.bbceng.info/Eng_Inf/EngInf_4.pdf
  4. ↑ http://www.bbc.co.uk/reception/transmitters/radio/digital_radio.shtml
  5. ↑ http://txlib.mb21.co.uk/main.php?g2_view=core.DownloadItem&g2_itemId=2489
  6. ↑ http://txlib.mb21.co.uk/main.php?g2_itemId=87&g2_imageViewsIndex=3

External links

This article is issued from Wikipedia - version of the Thursday, August 20, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.