BBC DAB National is a Digital audio broadcasting multiplex in the UK, for a number of radio stations which have UK wide coverage; the multiplex broadcasts on Block 12B (225.648 MHz). Digital Audio Broadcasting (DAB), also known as Eureka 147, is a technology for broadcasting of audio using digital radio transmission. ... In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ... A radio station is an audio (sound) broadcasting service, traditionally broadcast through the air as radio waves (a form of electromagnetic radiation) from a transmitter to an antenna and a thus to a receiving device. ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ...

The multiplex is owned and operated by the BBC and is transmitted from a number of transmitter sites across the country; it only carries BBC radio stations. For other uses, see BBC (disambiguation). ...

Stations Available

• BBC Radio 1 128kbps (stereo)
• BBC 1 Xtra 128kbps (stereo)
• BBC Radio 2 128kbps (stereo)
• BBC Radio 3 192kbps (stereo) / 160kbps when BBC Radio 5 Live Sports Extra is broadcasting.
• BBC Radio 4 FM 128kbps (stereo)
• BBC Radio 4 LW
• BBC Radio 5 Live 80kbps (mono)
• BBC Radio 5 Live Sports Extra 64kbps (Mono)* see above
• BBC 6 Music 128kbps (stereo)
• BBC 7 80kbps (mono)
• BBC Asian Network 64kbps (Mono)
• BBC World Service 64kbps (Mono)

BBC Radio 1 (commonly referred to as just Radio 1) is a British national radio station operated by the BBC, specialising in popular music and speech and is aimed primarily at the 14-29[1] age group. ... BBC 1Xtra is a UK radio station from the BBC specialising in urban and black music. ... BBC Radio 2 is one of the BBCs national radio stations and is the most popular station in the UK. It broadcasts throughout the UK on FM radio between 88 and 91 MHz from its studios in Western House, adjacent to Broadcasting House in central London. ... BBC Radio 3 is a radio station operated by the BBC within the United Kingdom. ... old Radio 4 logo BBC Radio 4 is a UK domestic radio station which broadcasts a wide variety of spoken-word programmes including news, drama, comedy, science and history. ... old Radio 4 logo BBC Radio 4 is a UK domestic radio station which broadcasts a wide variety of spoken-word programmes including news, drama, comedy, science and history. ... BBC Radio Five Live is the radio service providing live BBC News, phone-ins, and sports commentaries. ... BBC Five Live Sports Extra is an additional radio service provided by the British Broadcasting Corporation via digital radio and the digital satellite and digital terrestrial television services in the UK. It is not available via normal analogue radio. ... BBC 6 Music is one of the BBCs newest radio stations, launched on March 11, 2002 and originally codenamed Network Y. It is only available via digital media - DAB radio, the Internet and the various forms of digital television. ... BBC Radio 7 is a digital radio station broadcasting comedy, drama, and childrens programming 24 hours a day. ... Asian Network logo BBC Asian Network studio at The Mailbox shopping centre, Birmingham. ... The BBC World Service is one of the most widely recognised international broadcasters of radio programming, transmitting in 33 languages to many parts of the world. ...

Note

Radio 4 LW On DAB only covers Yesterday In Parliament and The Daily Service. The Daily Service is a Christian church service, often from Emmanuel Church in Didsbury, Manchester, England, broadcast every weekday morning between 9. ...

On 6 July 2006 (or thereabouts) the BBC permanently reduced the bit rate transmission of BBC Radio 3 from 192 kbit/s to 160 kbit/s. The resulting degradation of audio quality has prompted a number of complaints being made to the Corporation.^[1] BBC Radio 3 is a radio station operated by the BBC within the United Kingdom. ...

Broadcasting BBC Five Live Sports Extra requires reducing the bit rate of other networks; since the launch of Sports Extra, the BBC frequently reduced Radio 3 to 160 kbit/s when Five Live Sports Extra is on air. This was still considerably higher than any other BBC network. Recently, Radio 3's bit rate has been permanently reduced to 160 kbit/s instead of returning to 192 kbit/s once the sports commentary is over. The reason for this is that the BBC have introduced a non-stop repeating trail, at 32 kbit/s, promoting BBC Five Live and Sports Extra. This effectively keeps Sports Extra on air even when there is no sports coverage. According to the BBC Annual Report 2005-2006, the station only broadcast for a total of 1,209 hours (an average of just over 23 hours per week) last year whereas the trail runs permanently, using bandwidth previously allocated to Radio 3, except when there is a sports commentary.^{[citation needed]} BBC Five Live Sports Extra is an additional radio service provided by the British Broadcasting Corporation via digital radio and the digital satellite and digital terrestrial television services in the UK. It is not available via normal analogue radio. ... BBC Radio Five Live is the BBCs radio service providing live BBC News, phone-ins, and sports commentaries. ...

See also

• Digital radio in the United Kingdom

A typical DAB digital radio receiver with the Digital Radio Development Bureau DAB digital radio marketing logo In the United Kingdom, the roll-out of digital radio is proceeding since test transmissions were started by the BBC in 1990. ...

External links

• List of BBC DAB stations
• List of bitrates
• BBC Annual Report 2005-2006

References

1. ^ "Is the BBC climbing down about the reduction in bit rate on Radio 3?", digitalradiotech.co.uk, July 27, 2006.