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Carmarthen transmitting station

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The Carmarthen transmitting station (Welsh: Gorsaf drosglwyddo Caerfyrddin) was originally built by the BBC in 1964/65 as a relay for VHF radio and television.[1] 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.

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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.

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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.

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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.

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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.

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† 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.

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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.

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Digital radio (DAB)

6 June 2011 - present

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