Digital radio in the United Kingdom
In the United Kingdom, the roll-out of digital radio is proceeding since engineering test transmissions were started by the BBC in 1990 followed by a public launch in September 1995. The UK currently has the world's biggest digital radio network, with 103 transmitters, two national DAB ensembles and 48 local and regional DAB ensembles broadcasting over 250 commercial and 34 BBC radio stations across the UK. In the capital, London there are already more than 64 different digital stations available. In addition to DAB and DAB+, radio stations are also broadcast on digital television platform as well as internet radio in the UK. Between April 2007 and April 2008 the BBC trialled Digital Radio Mondiale on mediumwave and shortwave frequencies. Digital radio ensemble operators and stations need a broadcasting licence from the UK's media regulator Ofcom to broadcast.
Digital radio in the United Kingdom is being promoted by radio stations and the broadcasting industry on the premise that it provides superior quality sound and a wider choice of radio stations, is easier to use, and is resistant to the interference which other broadcast media are susceptible to. Notwithstanding one basic flaw which is not mentioned; the fact that many sets are inferior mono ones, there is the fact that the price paid for the extra number of stations is that the audio quality on DAB is lower than on FM. Also some areas of the country are not presently covered by DAB; the BBC says that it may not provide coverage to the final 10% of the population, and may use Digital Radio Mondiale instead. In 2011, Ofcom published a consultation with the intent to push DAB coverage across the United Kingdom up to the same level as enjoyed by FM broadcasting in the United Kingdom. The United Kingdom Government intends to migrate the vast majority of AM and FM analogue services to digital between 2015 and 2019, subject to targets being met for coverage, listening figures for digital radio and agreements in relation to funding and other decisions related to switchover being made under a Memorandum of Understanding between the Department for Culture, Media and Sport, broadcasters and ensemble operators.
In the UK, 45.3% of all radio listening hours by the second quarter of 2016 were through digital platforms, with DAB making up for the majority of digital radio listening (71%), and 55.7% of UK households claim to have access to a DAB radio set.
Digital Audio Broadcasting
Experimental transmissions of the DAB Eureka 147 standard from the Crystal Palace transmitting station by the BBC started in 1990 with permanent transmissions covering London in September 1995. With the expansion of its single-frequency network in the spring of 1998, the BBC national ensemble was available to 65% of the UK population by 2001, 85% by 2004 and 96.4% by 2015. DAB+ full-time broadcasts began in 2016.
The first national ensemble licence for DAB from the Radio Authority was advertised in 1998 and one applicant applied for the licence. The licence was awarded to the GWR Group and NTL Broadcast, who since the launch were renamed Arqiva. The two companies formed the Digital One ensemble, which began broadcasting on 15 November 1999. The Digital One ensemble has grown and is currently available to over 90% of the UK population although an Ofcom report into Digital Radio in 2015 puts robust household coverage at 89.8% of the UK.
Growth and benefits of DAB in the UK
In the United Kingdom, the uptake of DAB has increased since the launch of the BBC national DAB ensemble in 1995. Lower prices, new radio stations and marketing have increased the uptake of DAB radio in the UK. Digital radios were first sold as car radios in 1997, priced around £800, with hi-fi tuners costing up to £2,000 being released two years later. In 2001, Digital One invested in Frontier Silicon to produce a new processing chip which would allow cheaper portable radios to be produced. Roberts Radio, Goodmans and in 2002, Pure Digital's award winning Evoke series of radios broke the £100 price barrier, and DAB take up has increased since. As the result of the increase of uptake of DAB, electrical retailer Dixons announced in 2006 that it would discontinue selling analogue radios, though Dixons still continues to stock and sell analogue radios, and has given no indication of a timetable, as of August 2011.
The BBC and other DAB broadcasters have been encouraging DAB take up by promoting a number of features which are either new or improve upon former technology in their sales literature. The benefit of DAB is that due to the use of multiplexing technology and encoding technology, broadcasters including the BBC and EMAP have been able to launch exclusive digital radio stations alongside their existing analogue radio stations. Broadcasters also state that DAB offers better reception, without the problems of interference that are more noticeable through analogue radio. DAB radios also come with features such as station lists, so listeners do not need to retune their receivers, as well as scrolling text, providing information such as breaking news, travel information or the latest track information.
DAB has also been marketed as having two major advantages over analogue radio broadcasting in that using MPEG-1 Audio Layer II lossy audio compression technology and more recently DAB+ using High-Efficiency Advanced Audio Coding, parts of the audio spectrum that cannot be heard by humans are discarded, meaning less data needs to be sent over the air. This, as well as multiplexing technology, allows a number of channels to be broadcast together on one frequency as opposed to one channel for analogue radio broadcasts.
National, local and regional DAB ensembles use the same frequency for the area they cover. Using a single-frequency network, an ensemble broadcasting a number of stations can cover the same area as a number of FM frequencies which would be required to cover the same area for one station. The BBC carried out successful tests of a single-frequency network in London before launching its national DAB ensemble.
Criticisms of DAB in the UK
DAB technically provides low audio quality in the UK due to 98% of stereo stations using a bit rate level of 128 kbit/s. with the MP2 audio codec, which provides poorer sound quality than FM-quality (assuming good reception on both DAB and FM). In addition, DAB+ stations broadcast in the UK use a bitrate between 24 and 48kbit/s. A bit rate of 256 kbit/s has been judged to provide a high quality stereo broadcast signal. Also, a large and growing number of music stations are only transmitting in mono. Indeed, the bit rates used by the radio stations on other digital platforms, such as cable, terrestrial and satellite are usually higher than on DAB, so the audio quality is also higher. For example, all of the BBC stations use higher bit rates on the digital TV platforms than on DAB apart from the BBC World Service on Freeview. On the other hand, an Ofcom survey, which was undertaken due to many consultation responses citing poor DAB quality, found that 94% of DAB listeners thought DAB was at least as good as FM.
Ofcom estimates that even after extra spectrum has been allocated to DAB, around 90 local radio stations will be unable to transmit on DAB, either because there is no space for them on a local DAB multiplex, or because they cannot afford the high transmission costs of DAB that the multiplex operators are charging. Ofcom announced in 2005 that it regarded Digital Radio Mondiale (DRM) as an option for local stations unable to secure carriage or unable to pay the high transmission costs of DAB. The success of the small scale DAB multiplexes, subject to Parliamentary approval, may alleviate this issue to some degree. One of the drawbacks of DAB and DAB+ has not been addressed. In simple terms the frequency of a broadcast is the carrier frequency (i.e. a sine wave). In order to carry any information the carrier frequency must be modulated. The signal at the receiver (radio) is then demodulated and the information is retrieved. The demodulators for FM signals are almost instantaneous so that one can have radios in different areas and move between those areas to hear the broadcast continuously. In contrast the demodulators for digital signals take a finite time and each digital radio takes a different time to demodulate the broadcast signal, so that if you move between different radios that are spatially apart you are likely to hear the same part of the broadcast twice or miss parts of it depending on the time to demodulate the signal of the individual radios. The other drawback with DAB is that it is all or nothing. If there is any interference or loss due to moving out of the footprint of the broadcast signal you will receive no signal, whereas in the case of FM you can hear something even if it is crackly.
On 30 January 2008, a report in the Daily Mail claimed that there were not enough DAB radios being sold to support the service for the future and that people were favouring their traditional analogue radios over DAB. It also reported that unless sales started to rise, DAB in the UK could follow the same fate as Betamax Video Cassettes did in the 1980s. In January 2009, the Digital Radio Development Bureau announced that fewer DAB radio sets were sold in Christmas 2008 than in the previous year, although the group states that customer confidence in DAB remains high.
On 24 January 2009, Ofcom allowed electrical retailers to be granted a licence to rebroadcast DAB signals within their stores to demonstrate DAB radio sets within their stores. The United Kingdom consumer charity, Which? warned that consumers who could not get an adequate DAB signal could be misled by the in-store sets. The Digital Radio Development Bureau replied to the Which? report stating that stores contain a steel structure which produce a faraday cage effect where DAB signals are blocked out. The DRDB recommended that consumers should check DAB coverage online with their postcode before purchasing a DAB radio to avoid disappointment.
On 24 November 2010, a number of commercial radio operators refused to run an advertisement promoting DAB, one operator stating that it would be "fundamentally immoral and dishonest" until DAB coverage matches that of FM. Commercial radio executives have argued that the BBC should pick up the majority of the cost of expanding the DAB network across the United Kingdom.
Company pullouts of DAB
On 11 February 2008 GCap Media chief executive Fru Hazlitt presented a new strategy for GCap to fend off a takeover bid from Global Radio. The strategy for DAB included the closure of national DAB stations Planet Rock and theJazz on 31 March 2008 as well as the disposal of Digital One to Arqiva for £1. Hazlitt also said that the DAB platform in the UK was not economically viable and that growth in digital radio would come from FM and Internet Radio, announcing a deal with Apple to stream GCap stations on the iPod touch and iPhone on the same day.
The takeover of GCap by Global Radio has led to them keeping Digital One and looking to take a stake in Channel 4's second national commercial multiplex.
The Digital Radio Development Bureau and the 4 Digital Group defended DAB by stating that DAB was showing signs of growth and would become more attractive to consumers and broadcasters. The BBC and 4 Digital Group issued a joint statement on 12 February 2008 stating their commitment to DAB.
4 Digital Group
On 10 October 2008, Channel 4 announced that it would pull out of the 4 Digital Group consortium, that it would not launch services on the second national multiplex, and that it would axe its three digital radio services, E4 Radio, Channel 4 Radio and Pure 4. Channel 4 chief executive Andy Duncan admitted that ending Channel 4's foray into digital radio could cost the corporation £9 million.
DAB+ using either Low Complexity Advanced Audio Coding or High-Efficiency Advanced Audio Coding version one (Spectral Band Replication (SBR)) or two (SBR plus Parametric Stereo) and the more robust Reed-Solomon error correction and equal error protection as opposed to MPEG-1 Audio Layer II encoding and unequal error protection was first tested in the United Kingdom in 2013 before regular services were launched in 2016.
The United Kingdom Government has ruled out any transition from DAB to DAB+ for the foreseeable future, a decision backed by the radio industry and the Department for Culture, Media and Sport. The chief executive of the DRDB, Tony Moretta, mirrored the calls by the radio industry and experts to not adopt DAB+ in the UK. In an interview with the TechRadar website in 2009, he stated that DAB+ was a "red herring" and may not be introduced in the UK for the foreseeable future due to the growing number of digital radio sets currently being sold and used in the future which cannot decode HE-AAC and therefore access DAB+ stations. Moretta also cited greater expense for broadcasters and overall satisfaction with the current audio quality of DAB stations of which a move to DAB+ would only benefit a small number of audiophiles as other reasons. Independent radio analyst Grant Goddard also stated that there was an economic decision not to adopt DAB+ for both the industry and consumers.
Despite opposition aired to the Government regarding the introduction of DAB+ in the United Kingdom by the industry and experts, Ofcom began testing DAB+ on the Brighton Experimental ensemble in January 2013 for a period of one month. The Department of Culture, Media and Sport published minimum specifications for digital radio receivers in the UK in February 2013 which states that a receiver sold in the UK must be capable of decoding a DAB+ stream of up to 144 capacity units.
In early 2016, two new stations launched DAB+ services on the Portsmouth trial multiplex. The operators of the second national multiplex, Sound Digital launched three full-time broadcasting DAB+ services on 29 February 2016. In September 2016 a fourth DAB+ station "Union JACK" was launched using 24 kbit/s DAB+ Stereo HE-AAC v2 on the Sound Digital Network. As of September 2016, there are now over 30 DAB+ stations being broadcast in the UK.
Whilst there are no plans in the foreseeable future for the vast majority of BBC and commercial stations to transition from DAB to DAB+, Jack FM Surrey switched to DAB+ for its digital broadcasts in August 2016 with a number of stations on the small scale DAB multiplexes also switching from DAB to DAB+ since early 2016.
DAB frequency plan
DAB radio stations in the United Kingdom are broadcast on a number of frequency blocks on VHF Band III. The original plan devised in Wiesbaden for the framework of DAB in Europe was to allocate frequency blocks 11B to 12D for UK DAB broadcasting. However, as part of its Review of Radio, Ofcom has expanded the frequency allocations for DAB and has advertised local and a national ensemble licence on blocks outside the original Wiesbaden plan on 10B to 10D and 11A. Block 5A has also been reserved for the launch of local ensembles. In 2015, additional blocks were opened up for small scale DAB trials for an initial period of nine months. Ofcom reitreated the use of a number of frequency blocks between 7D and 9C for any future roll-out of small scale DAB multiplexes in its final report regarding the small scale DAB multiplexes published in September 2016.
Under a Maastricht plan in 2002, the UK also has L band allocations for local terrestrial DAB, though there are no plans to broadcast any digital radio stations on L band. Ofcom auctioned spectrum in L band in 2008 for a number of uses, including terrestrial digital radio. On 16 May 2008, Ofcom declared that Qualcomm UK Spectrum Ltd had won the auction of L band frequencies in the UK.
BBC National DAB
The BBC's national DAB ensemble broadcasts on frequency block 12B (225.648 MHz) across the United Kingdom, with coverage currently at 96.4%. The multiplex is owned and operated by the BBC and is transmitted from a number of transmitter sites across the country. The BBC's national multiplex carries only BBC national radio stations. Local BBC radio stations are carried on the relevant local DAB ensemble where commercial DAB licences are operating.
Commercial DAB multiplexes
There are a number of commercial DAB multiplexes operators in the UK who run 48 local and regional DAB multiplexes across the United Kingdom. operators include the two national operators, Digital One and Sound Digital as well as local multiplex operators including NOW Digital, Bauer Media Group, UTV, Switch Digital and MuxCo. Local and regional ensembles cover 77.8% of UK households.
Trial small scale DAB multiplexes
Ten small scale DAB multiplexes broadcast in a number of areas across the UK on intinally a nine-month trial, extended by a further two years by Ofcom at the request of DCMS.
Digital terrestrial television
Digital radio on the digital terrestrial platform started on 30 October 2002 with the launch of the BBC's digital only radio services, BBC 1Xtra, BBC Five Live Sports Extra, BBC 6 Music, BBC 7 and the BBC Asian Network as well as existing stations BBC Radio Five Live and the BBC World Service. All the stations broadcast on the BBC's multiplex B.
Digital satellite radio
Unlike North America, the UK does not have a commercial satellite radio service. The North American service is provided by a company called SiriusXM.
There are radio stations broadcasting via Satellite to the United Kingdom, however these are aimed at home users for playback through their televisions since these same satellites are also used for television broadcast and usually use SES' Astra series of satellites at 28.2° east or the Eutelsat 28A satellite at 28.5° east. Radio stations broadcast free-to-air via the Sky Digital, Freesat from Sky platforms and any DVB-S compliant set-top box. The Freesat platform has all the BBC's national and regional digital radio stations as well as BBC London 94.9 from the launch on 6 May 2008 on the EPG.
WorldSpace was planning a subscription based digital radio satellite service on the upper frequencies of the L band, however, Qualcomm beat WorldSpace in 2008, securing the L band frequencies in the Ofcom auction process.
Digital cable television
In the United Kingdom, over 350 of the UK's radio stations also stream their stations online, not including Restricted Service Licensed radio stations, Hospital radio stations and stations who solely broadcast online. RAJAR figures taken between April and May in 2008 showed that 14.5 million people have listened to radio online with 9.4 million people listening every week. As well as listening through a media player on a computer, a number of British firms, including BT Group, Reciva, Pure Digital, Roberts Radio, Dixons and Acoustic Energy have brought out Internet radio devices which use the Wi-Fi signal from a router to stream Internet radio stations within range of a Wi-Fi router. Apple and GCap Media made a deal in February 2008 for GCap stations to be broadcast through iPhone and iPod touch devices. Recently, dedicated smartphone and tablet computer applications published by radio stations and third party companies as well as smart TV applications also allow UK radio stations to be listened to.
In 2006, the Phonographic Performance Limited (PPL) announced that it would charge additional royalty fees on UK Internet radio stations if they broadcast outside the UK. Radio stations which stream online including GCap Media and GMG Radio, have implemented IP blocking to prevent listeners outside the UK from listening to their radio stations and therefore avoided the increased fees.
In March 2007, a BBC News article reported that the PPL were re-negotiating royalty fees paid by UK Internet radio stations, and the result of the negotiations would be that fees would increase.
In 2011, the BBC and commercial radio operators through the industry body, RadioCentre, launched a unified front end player for UK radio station Internet streams on personal computers and laptops named Radioplayer. The player replaced the various listen now windows on radio station websites and also added listen again capabilities for individual shows if the station supported it.
Digital Radio Mondiale
Digital Radio Mondiale (DRM - not to be confused with Digital Rights Management) is being considered by Ofcom for introduction in Britain in 2012, on the present AM medium wave band. In the present day, transmissions are limited to a small number of broadcasts by the BBC and other international broadcasters.
In 2005, tests of DRM on shortwave radio from European transmitters broadcasting into the United Kingdom were performed by Virgin Radio, Classic Gold, Premier Christian Radio, Virgin Radio Classic Rock, Asian Sound and CVC.
The British Broadcasting Corporation started broadcasting the BBC World Service on shortwave and mediumwave radio for a few hours a day across Europe from Orford Ness in Suffolk and Kvitsøy in Norway, the latter being receivable across England, Wales and Southern Scotland. Today, the BBC broadcasts the BBC World Service using DRM for one hour a day from the Woofferton transmitting station in Shropshire.
The BBC undertook a trial of the digital radio mondiale (DRM) technology, which allowed them to explore digital radio using medium-wave frequencies. The trial broadcast BBC Radio Devon using the new technology in the Plymouth area from April 2007 and closed down on 31 October 2008. In May 2009, the BBC released a report on the trial in Devon. The report gave a number of conclusions about DRM from the trial:
- The sound quality from the trial was better than AM quality, but not as good as average DAB quality;
- The daytime coverage of the DRM trial extended further than the discontinued AM service. However, the night-time service, as expected to be smaller than daytime coverage due to the characteristics of medium wave broadcasting, did cause problems with interference to the DRM trial. The BBC stated this interference can be avoided, but only with a redesign of the transmission network;
- A single frequency network is possible and would be significantly robust.
Digital Multimedia Broadcasting
In 2006, National Grid Wireless carried out a technical trial of T-DMB and DAB-IP on the Stoke & Stafford (formerly UTV-EMAP/Bauer Stoke) ensemble. The trial assessed the reception qualities of both technologies in urban and rural areas as well as the mobile television and radio services which could be delivered.
On 29 January 2009 the UK Government's interim report into digital communication for the future by Lord Carter, Digital Britain, made the suggestion that DAB would be the future direction of digital radio in the United Kingdom. The report stated that only when the following conditions are met, a migration from FM to DAB would begin:
- Digital radio listening figures hit at least 50%;
- Coverage of DAB matches that of FM, of 90% which the report stated would not be achieved until 2015. The report mentioned that the Government would work with the BBC to meet the coverage target.
The original Interim Report of the Digital Radio Working Group published in 2008 specified that the 50% threshold for listening figures should be based on those for DAB. This was subsequently watered down to incorporate listening via any digital platform so as to make it easier to meet the criteria. The main driver behind the proposed move to switch off the FM transmission system is still down to the intense lobbying of the commercial radio sector so that they can save costs.
Carter also suggested in his report that manufacturers of devices which can pick up radio signals ensure it is DAB ready for the forthcoming migration. The report also indicates plans to create a Digital Radio Delivery Group (DRDG), made up of the major investors of DAB, whose plan it will be to ensure a smooth transition from AM and FM to DAB for consumers. They will also advise on digital radio migration. On 22 September 2009 the DRDG and Digital Radio Development Bureau were integrated into one organisation for this purpose - Digital Radio UK.
On 16 June 2009 the final Digital Britain report concluded that a switchover of all national and local FM services which currently broadcast on DAB multiplexes would take place in 2015 and that DAB would be chosen to take the UK to and beyond switchover. The Digital Economy Act 2010 has a requirement stating that the United Kingdom must prepare for digital switchover. To aid the transition to digital radio, Digital Radio UK started a Radio Amnesty during May and June 2010 where people could trade in an old AM/FM analogue radio for a 10-20% discount on a new DAB digital radio from participating retailers. Analogue sets which can be reconditioned will be sent to southern Africa.
On 30 November 2010 it was reported that ministers were considering delaying the switchover to DAB until 2017 at the earliest., however Ofcom did publish official plans for increasing DAB reception in various places around the same date.
On 2 July 2012, the Department for Culture, Media and Sport created a Memorandum of Understanding (MoU) with the BBC and commercial radio broadcasters and ensemble operators as to where the future direction of digital radio should go with a three phase plan toward FM switchoff. A decision on the switchover will be made by the Government in 2013. The MoU creates three phases toward switchover:
Application and licensing
The United Kingdom media and communications regulator Ofcom (and before the formation of Ofcom, the Radio Authority) advertises and provides the licenses for digital radio services in the United Kingdom, under the Broadcasting Acts of 1990 and 1996.
Application and licensing procedures
Ofcom awards licenses for digital radio services differently depending on the type of service and the platform. Ofcom advertises the licences of new digital radio ensembles and are subject to an open competition to the highest bidder. Ensemble licence awards are awarded for twelve years. On digital television services, individual stations can apply for either a digital cable and satellite licence to broadcast on the aforementioned platforms, or apply for a digital terrestrial licence to broadcast on digital terrestrial television.
On Digital Terrestrial Television and DAB, broadcasters also need to contact the ensemble or multiplex operator of a local or national DAB ensemble or digital terrestrial multiplex to broadcast within a region, subject to a fee payable to the ensemble operator. On Digital Satellite, radio stations need to secure capacity with a transponder operator and an uplink to a satellite. To broadcast on the Sky Digital platform, a broadcaster must also secure an EPG slot allowing viewers to navigate to their channel using the set-top-boxes provided by British Sky Broadcasting. A request for an EPG slot must be done up to nine months in advance. The same procedure applies to secure a slot on the Freesat platform, although stations need to contact Freesat UK Ltd instead of BSkyB. On Digital Cable, broadcasters need to contact a cable supplier for carriage.
All stations broadcast in the UK must legally hold a music copyright licence from the Phonographic Performance Limited, PRS for Music and Mechanical-Copyright Protection Society in order for royalties to be paid to the musicians the main bodies represent.
First national ensemble
On 24 March 1998, the Radio Authority advertised for the first (and at the time, the only one planned) national ensemble to be broadcast on DAB. The three national commercial services on FM and mediumwave had to be included as part of the ensemble, Classic FM, talkSPORT and Virgin Radio. The licence was awarded to the sole applicant, GWR Group and NTL Broadcast to form Digital One. The original licence application included the following stations:
|Digital One Ltd (original application)|
|Classic FM||Classical music||GWR (now part of Global Radio)|
|Classic Gold Rock||Rock music||NTL|
|Club dance||Dance music||TBA|
|Plays, books and music||Comedy, drama and serials||TBA|
|Rolling news service||Rolling news||ITN|
|Soft AC||Female contemporary music||TBA|
|Sports channel||Live sports and comment||Talk Radio UK|
|Talk Radio (now talkSPORT)||Talk radio||Talk Radio UK (now owned by UTV Radio)|
|Teen and chart hits||Pop and dance music||GWR|
|Virgin Radio||Complementary rock music||SMG plc|
After the closure of PrimeTime Radio in 2006, the original licence was amended to allow the launch of a new classic and contemporary jazz service, theJazz which was launched on 25 December 2006, before the 31 December 2006 deadline set in the licence amendment.
On 26 July 2013, Digital One extended its broadcasts to Northern Ireland. Previously, only one VHF Band III frequency was allocated to Northern Ireland which was allocated to the local commercial ensemble. Block 11D became available in 2013 after digital television switchover in the United Kingdom and the Republic of Ireland.
The Radio Authority (and subsequently Ofcom) continue to award regional ensemble licences to a number of radio groups with advertising of the licences starting from 1998, and licence awards being awarded from 10 May 1999, with the Birmingham ensemble being the first local licence being issued to CE Digital. The Birmingham ensemble licence award was followed by awards for licences in Manchester, Greater London, Glasgow and South Yorkshire, with more licences being awarded afterwards.
In October 2006, Ofcom announced a timetable of locations which would get its own DAB ensemble, where a local ensemble does not currently offer coverage. Three blocks will be made available in VHF Band III. In May 2007, Ofcom replaced the York and Scarborough proposed licence area for a licence which covers the whole of North Yorkshire, and the Guildford plus Reigate and Crawley licences were merged to cover Surrey.
Areas covered are as follows:
|Area||Advertisement date||Block||Winning applicant||Ensemble name|
|Hertfordshire, Bedfordshire and Buckinghamshire||December 2006||10D||NOW Digital||NOW Home Counties|
|Derbyshire||January 2007||10B||NOW Digital (East Midlands)||NOW Derbyshire|
|Wrexham and Chester||February 2007||10D||MuxCo||MuxCo North East Wales & West Cheshire|
|Hereford and Worcestershire||March 2007||10B||MuxCo||MuxCo Hereford & Worcester|
|Northamptonshire||April 2007||10C||NOW Digital||NOW Northampton|
|Oxfordshire||May 2007||10B||NOW Digital||NOW Oxford|
|Gloucestershire||July 2007||10C||MuxCo||MuxCo Gloucestershire|
|North Yorkshire||June 2007||12D||MuxCo||MuxCo North Yorkshire|
|Mid and West Wales||August 2007||12D||MuxCo||MuxCo Mid and West Wales|
|Surrey and Northern Sussex||September 2007||10C||MuxCo||MuxCo Surrey and Northern Sussex|
|Lincolnshire||October 2007||10D||MuxCo||MuxCo Lincolnshire|
As part of the Digital Economy Act 2010 which gained Royal Assent and became law on 8 April. 2010, some DAB ensembles will be reorganised and merged. As a result, local ensembles waited for both the act to commence on 12 June 2010 and a report on the planning of DAB coverage and frequencies across the UK, with the final publication made to Government on 1 May 2012 before going ahead with announcements on the launch of additional local ensembles.
The first regional licence to cover a greater area of land compared to a local ensemble was awarded on 6 October 2000 to Switch Digital for Central Scotland Other areas which were awarded and classed as regional licences include:
|Region||Operator||Licence award date||On air date||Closure date|
|Central Scotland||Switch Digital||6 October 2000||June 2001||N/A|
|North East England||MXR Ltd||15 December 2000||July 2001||29 July 2013|
|South Wales and the Severn Estuary||MXR Ltd||23 January 2001||July 2001||29 July 2013|
|West Midlands||MXR Ltd||9 February 2001||August 2001||27 August 2013|
|North West England||MXR Ltd||9 March 2001||September 2001||24 September 2013|
|Yorkshire||MXR Ltd||28 November 2002||June 2003||29 June 2015|
In March 2009, Ofcom made a recommendation to the Government in their Radio in Digital Britain report that the regional ensembles should expand into a nationwide regionalised service to fill the gap made by the 4Digital Group pulling out of the second national ensemble. Ofcom cited that the regions for the second national ensemble would be:
- The East Midlands, East Anglia, mid and southern Lincolnshire;
- London, Southern England, the South East and the South Midlands;
- Northern Ireland;
- North East England and Cumbria;
- North West England;
- The West Midlands;
- The West and South West of England;
- Yorkshire, the North Midlands and North Lincolnshire.
On 25 September 2012, it was announced that the MXR mutliplexes will close between July and September 2013 after the shareholders Global Radio & Arqiva decided not to renew the licences. Digital Radio UK stated that the released frequencies of the closed regional multiplexes would be reused for local DAB coverage roll-out.
Second national ensemble
First licence advertisement
Ofcom announced in 2005 that they would be advertising for the second national digital ensemble. As a result, GCap threatened to take Ofcom to court after being told by the Radio Authority that there would not be another national ensemble. The court action was dropped after Ofcom assured GCap that none of the stations on the second ensemble would compete with existing stations on the Digital One ensemble.
On 1 December 2006, Ofcom advertised a licence for a second national digital ensemble to launch new digital radio and multimedia services on frequency block 11A (216.928 MHz). Applications needed to be submitted to Ofcom by 28 March 2007.
On 29 March 2007, Ofcom announced that it had received two applications for the second national digital ensemble, from the 4 Digital Group and National Grid Wireless. The radio channels which made up both applications are as follows:
On 6 July 2007 Ofcom awarded the licence for the second national ensemble to the 4 Digital Group, who were required to launch its services one year after its licence award. However, on 10 October 2008 the 4 Digital Group pulled its plans for digital radio, including the launch of the second multiplex. Ofcom held talks with the other remaining shareholders of the 4 Digital Group to see if they were willing to continue with the launch. In March 2009, Ofcom recommended to the Government that the second national ensemble should be regionalised, formed by the existing regional ensembles.
Second licence advertisement
On 1 July 2014, Ofcom re-advertised the second national ensemble licence on frequency 11A for interested parties to submit applications by 31 October 2014. The deadline was extended to 15:00 on 29 January 2015.
On 29 January 2015, it was announced that two bidders had applied for the licence to run the second national ensemble. Listen2Digital, run primarily by Orion Media and Babcock International Group amongst others and Sound Digital, run by Arqiva, Bauer and UTV amongst others. On 27 March, Sound Digital was announced as the winning bidder.
Small Scale DAB Trials
After experimentation on the Brighton experimental ensemble, Ofcom advertised for small scale DAB multiplexes to broadcast across the United Kingdom on ten localised multiplexes for a nine-month trial period, then extended for an extra two years. The trials will test the viability of using free and open source software (FOSS) with low cost equipment to broadcast from a single transmitter, a single frequency network or channel repeaters to allow smaller radio stations to broadcast more cost effectively than is currently possible on local multiplexes.
|Brighton and Hove||Brighton and Hove Radio|
|Norwich||Future Digital Norfolk|
|Single Frequency Network|
|Glasgow||Brave Broadcasting (formerly Scrimshaws Information Directories)|
In September 2016, Ofcom released its final report into the experiences and results of the small scale DAB trials deeming them to be successful and technically sound. A number of conclusions were made regarding the trials:
- The hardware and FOSS worked well with few technical problems. Issues identified regarding single frequency networks and software stability and usability have been identified and have either been fixed or are being worked on;
- Multiplex operators are working together, sharing experiences of running the trial multiplexes and furthering DAB features such as slideshows and additional DAB+ services. Seventy new services have launched across the ten multiplexes with a test and development multiplex launched afterward, inspired by the trials;
- There is demand for a roll-out of small scale DAB multiplexes across the UK which Ofcom deems as "technically possible and commercially sustainable".
A future roll-out of small scale DAB multiplexes would be performed with a number of DAB frequency blocks, subject to business users migrating away from those frequencies and also subject to Parliamentary approval. This should allow at least one multiplex in most parts of the UK.
Digital Radio UK
Digital Radio UK is an organisation which represents the interests of the digital radio industry including the BBC, commercial radio companies and transmission network operator, Arqiva. The organisation also promotes the use and take up of DAB in the United Kingdom and ensure that the deadline for digital migration in 2015 is met. Digital Radio UK is formed from the Digital Radio Delivery Group which also absorbed the Digital Radio Development Bureau (DRDB). Part of DRDB's plans, and under Digital Radio UK still is, will be to promote DAB uptake through a website for consumers as well as print and radio advertising.
- See Macnamara, Thereza (2010). ·Introduction to Antenna Placement and Installation. USA: John Wiley and Sons. pp 190 to 193. ISBN 0-470-01981-6 for an explanation of carrier frequencies and modulation.
- Capacity units refer to a measure of a streams bitrate in addition to error correction added to the aforementioned stream. Capacity units are used to accurately determine the total capacity of a DAB ensemble.
- Regional ensembles for the West Midlands closed on 27 August 2013. Yorkshire closed on 29 June 2015.
- Regional ensembles for the North East, South Wales and the Severn Estuary closed on 29 July 2013. North West closed on 24 September 2013.
- Although not strictly classed as a digital radio service, BBC Parliament broadcast on digital terrestrial in audio only up until the launch of Freeview on 30 October 2002.
- One exception to this was jazzfm.com, which continued to be streamed outside the UK.
- Radio in the United Kingdom
- DAB ensemble
- Digital audio broadcasting
- Digital Radio Mondiale
- List of radio stations in the United Kingdom
- The Radio Academy
- BBC - Devon - Digital Medium Wave - Digital medium wave trial report
- "An approach to DAB coverage planning". Ofcom. 2011-06-22. Retrieved 2011-07-24.
- "An approach to DAB coverage planning". Ofcom. 2011-06-22. Retrieved 2011-07-24.
- "RAJAR Data Release - All Radio Listening via Platform Share" (PDF). RAJAR. 2016-08-04.
- "RAJAR Data Release - % of UK population who claim to have access to a DAB set" (PDF). RAJAR. 2016-08-04.
- "Milestones - 1990s". BBC Research and Development. Archived from the original on 1 December 2004. Retrieved 2013-12-29.
- "The Status of T-DAB implementation in Europe". The Catalyst. Archived from the original on 21 January 2005. Retrieved 2007-04-17.
- "So how does the BBC fit in?". Emirates SEO.
- "DCMS REVIEW OF DAB DIGITAL RADIO" (PDF). BBC. October 2004. Archived from the original (PDF) on 28 November 2007. Retrieved 2007-06-10.
- "The Communications Market: Digital Radio Report" (PDF). Ofcom. 2015-11-19. Retrieved 2016-09-11.
- "Broadcasting Act 1996". Office of Public Sector Information. Her Majesty’s Stationery Office. Retrieved 2007-04-21.
- "APPENDIX 3.6 - Digital audio broadcasting" (PDF). Competition Commission. Retrieved 2007-04-17.
- "World DAB Forum - DAB: a digital revolution for Europe and the World" (PDF). Radio Televisión Española. World DAB Forum. November 1999. Retrieved 2007-04-17.
- "Frequently Asked Questions". Digital One. Retrieved 2009-05-02.
- "DAB radio sales pass 3m landmark". Digital TV Group. Lovelace Consulting. 2006-05-03. Retrieved 2007-06-10.
- "PURE EVOKE SERIES AWARDED GET CONNECTED "PRODUCT OF THE YEAR"". Pure Digital. 2007-02-13. Archived from the original on 3 March 2007. Retrieved 2007-06-10.
- "Dixons turn off analogue radio supply". Manchester Evening News. 2006-08-16. Retrieved 2007-06-10.
- "How to listen to digital radio". BBC. Archived from the original on 17 October 2007. Retrieved 2007-06-12.
- "Emap Digital Radio". EMAP. Retrieved 2007-06-12.
- "What is DAB digital radio?". BBC. Archived from the original on 8 July 2007. Retrieved 2007-06-12.
- I.P. Duncumb, A.L. Bridgen and J. L. Alty. "THE USE OF MORE EFFICIENT AUDIO COMPRESSION TO PROVIDE LOW BIT-RATE SPECIALIST SERVICES OVER DAB". Loughborough. Retrieved 2007-06-12.
- "Field trials with a high power VHF single frequency network for DAB" (PDF). European Broadcasting Union. 2004. Retrieved 2007-06-12.
- DAB Around the World
- Robinson, Dr David J. "Regulation in digital broadcasting". University of Essex. Department of Electronic Systems Engineering. Retrieved 2007-05-21.
- "Audio Quality comparison of PCM, DAB, FM and AM". Associated Broadcast Consultants.
- The bit rate of many stations has dropped still further in recent years with Absolute Radio (formerly Virgion Radio with a bit rate of 160 kbps) has split its bit rate into 3 stations (inc Absolute 80s and 90s) all now in mono at only 80kbps. Even Radio 4 DAB is in mono most evenings after 7pm, so in Manchester the Steve Penk Wind-Up Channel is broadcast with a higher bit rate than BBC Radio 4 at 96kbps in the evenings. Radio 4 now broadcasts the BBC World Service in stereo on its DAB multiplex at a higher bit rate than its own channel in the evenings. Page 26 of BBC R&D White Paper WHP 061 June 2003, DAB: An introduction to the DAB Eureka system and how it works http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP061.pdf
- "Mono is the new stereo on national DAB". Digitalradiotech. 2006-12-15. Retrieved 2007-05-21.
- "Digital Radio Platform Bit Rates". Digitalradiotech. Retrieved 2007-05-21.
- Pages 15-16 and 113-118 The Future of Radio Consultation April 2007 http://stakeholders.ofcom.org.uk/binaries/consultations/futureradio/future.pdf
- "Ofcom Encourages UK to Move to DAB Version 2". Digitalradiotech. 2006-02-22. Retrieved 2007-05-21.
- "Radio - Preparing for the Future - Phase 2: Implementing the Framework" (PDF). Ofcom. 2005-10-19. Archived from the original (PDF) on 6 February 2007. Retrieved 2007-05-21.
- Revoir, Paul (2008-01-30). "The new Betamax: Will digital radio follow the march into hi-tech oblivion?". London: Daily Mail. Retrieved 2008-02-25.
- Welsh, James (2009-01-27). "DAB radio sales slow year-on-year". Digital Spy. Retrieved 2009-01-27.
- "In-store demos of DAB radios 'could be misleading'". Which?. 2009-01-24. Archived from the original on 29 January 2009.
- Plunkett, John (2010-11-24). "Commercial stations refuse DAB ads". The Guardian. Retrieved 2010-11-24.
- "Fuzzy Reception At GCap". The Business. Dow Jones Newswire. 2008-02-11. Retrieved 2008-02-25.
- "GCap Media plc Strategy Presentation Statement" (PDF). GCap Media. 2008-02-11. Archived from the original (PDF) on 27 February 2008. Retrieved 2008-02-25.
- Plunkett, John (2008-02-11). "Hazlitt: DAB 'not economically viable'". London: The Guardian. Retrieved 2008-02-25.
- Allen, Katie (2008-02-11). "GCap to pioneer 'listen and buy' radio for iPods". London: The Guardian. Retrieved 2008-02-25.
- Parsons, Russell (2008-02-11). "DRDB defends DAB after GCap decision". mad.co.uk. Retrieved 2008-02-25.
- "DAB is not dead, says BBC". Radio Today. 2008-02-12. Retrieved 2008-02-25.
- Welsh, James (2008-10-10). "Channel 4 axes radio services". Digital Spy. Retrieved 2008-10-10.
- Plunkett, John (2008-10-21). "Channel 4: Digital radio misadventure could cost £9m". London: The Guardian. Retrieved 2009-01-27.
- "Digital switchover of television and radio in the United Kingdom - Communications Committee Contents - CHAPTER 5: Digital radio: What needs to be done?". UK Parliament. Retrieved 2012-08-07.
- "The Future of Radio" (PDF). Ofcom. 2007-04-17. pp. 113–117. Archived from the original (PDF) on 4 July 2008. Retrieved 2009-08-16.
- Hartley, Adam (2009-04-13). "DRDB chief: "DAB+ is a red herring"". TechRadar. Retrieved 2009-08-16.
- Hartley, Adam (2009-04-13). "Interview: The future of digital radio". TechRadar. Retrieved 2009-08-16.
- "Channel 4 proposes to use DAB+ on new national commercial multiplex". Digital Radio Tech.
- "Ofcom testing DAB+ in the Brighton area". Radio Today. 2013-01-10. Retrieved 2013-01-13.
- "Minimum specifications for digital radio receivers in the UK in February 2013" (PDF). Department of Culture, Media and Sport. 2013-02-19. Retrieved 2014-08-17.
- "BBC to test DAB+ radio service this year". Radio Today. 2014-03-24. Retrieved 2014-03-25.
- Deegan, Matt (2014-09-01). "Folder Media Starts DAB+ Test". Folder Media. Retrieved 2014-09-01.
- "Boost for Portsmouth local DAB service". www.a516digital.com. 2016-01-29. Retrieved 2016-02-04.
- "18 stations for new UK DAB multiplex |". advanced-television.com. 2016-02-03. Retrieved 2016-02-04.
- Frequency Finder DK - Digital updates
- "DAB+ switch approved for two Surrey stations". a516digital. 2016-08-10. Retrieved 2016-10-01.
- "UNITED KINGDOM DIGITAL RADIO ACTION PLAN, TECHNOLOGY AND EQUIPMENT GROUP, MINIMUM SPECIFICATIONS FOR DAB AND DAB+ PERSONAL AND DOMESTIC DIGITAL RADIO RECEIVERS. DRAP-TEG-002" (PDF). Department of Culture, Media and Sport. Retrieved 2013-02-23.
- "Radio – Preparing for the Future - Appendix D: Options for DAB replanning – A report to the DRDB - Analogue Radio Switchover Group" (PDF). Ofcom, Arqiva. pp. 9–10format=pdf. Retrieved 2007-04-21.
- "An approach to DAB coverage planning" (PDF). Ofcom. 2011-06-22. Retrieved 2011-09-22.
- "Small scale DAB trials" (PDF). Ofcom. 2015-02-24. Retrieved 2015-09-06.
- "Small Scale DAB Trials - Final Report" (PDF). Ofcom. 2016-09-26. p. 26. Retrieved 2016-09-26.
- "L-band Allocations". DAB Ensembles Worldwide. Retrieved 2007-04-21.
- "1452-1492 MHz (L Band)". Ofcom. Retrieved 2008-05-03.
- "Ofcom awards spectrum licence to Qualcomm UK Spectrum Ltd". Ofcom. 2008-05-16. Retrieved 2008-05-16.
- "National radio stations in the United Kingdom". radio-now.co.uk. Retrieved 2007-04-15.
- "BBC local radio on DAB - transmitter information". British Broadcasting Corporation. Retrieved 2007-04-15.
- "Freeview to launch on 30 October". BBC Press Office. 2002-10-03. Retrieved 2007-04-15.
- Wilkes, Neil (2003-02-12). "Freeview launch for Radio 1 - 4". Digital Spy. Retrieved 2007-04-15.
- "BBC Radio stations to move multiplexes". Deeteetee.co.uk. 2007-09-10. Retrieved 2008-01-19.
- "Freeview - Radio". DTV Services Limited. Retrieved 2007-04-15.
- "Sky Digital - Freesat: Channel Lineup". Digital Spy. Archived from the original on 4 April 2007. Retrieved 2007-04-16.
- "WorldSpace bids for L-band spectrum in UK". Radio Netherlands International. 2008-04-19. Retrieved 2008-05-03.
- Ray, Bill (2008-04-18). "Ofcom lifts the lid on L-band bidders". The Register. Retrieved 2008-05-03.
- "Digital cable". RJ Productions. Retrieved 2007-04-16.
- Lo, Vincent. "UK Radio Stations broadcasting on the Internet". Radiofeeds.co.uk. Retrieved 2007-05-12.
- Dowell, Ben (2008-07-02). "Podcasts help lift live radio audiences". London: The Guardian. Retrieved 2008-07-04.
- Smith, Tony (2004-04-23). "Firms prep Wi-Fi Internet radio tuners". The Register. Retrieved 2007-06-12.
- Hilton, Kevin (September 2006). "UK streamed radio blocked by copyright" (PDF). Pro Sound News Europe. p. 25. Retrieved 2007-04-19.
- Grossman, Wendy M (2006-05-04). "Will licensing kill the radio star?". London: The Guardian. Retrieved 2007-04-19.
- "Royalties threaten internet radio". BBC News. 2007-03-08. Retrieved 2007-04-19.
- Barnett, Emma (2011-03-31). "Radioplayer: radio's digital future". The Daily Telegraph. Retrieved 2013-07-26.
- "Digital Radio Mondiale | Broadcast Schedule". www.drm.org. Retrieved 2016-09-26.
- "DRM UK". DRMRadio. Archived from the original on 5 April 2007. Retrieved 2007-04-21.
- "BBC Launches DRM Service In Europe". British Broadcasting Corporation. 2005-09-07. Retrieved 2007-04-21.
- "Live Broadcasts Schedule". Digital Radio Mondiale. Archived from the original on 28 April 2007. Retrieved 2007-04-21.
- "DRM Schedule - Kvitsoy". DRM DX. Retrieved 2007-04-21.
- "Digital Medium Wave". British Broadcasting Corporation. Retrieved 2007-04-15.
- "Project Mayflower: The DRM Trial Final Report" (PDF). British Broadcasting Corporation. April 2009. Retrieved 2009-05-28.
- "Project Mayflower - Digital Radio Mondiale (DRM) Trial - Final audience research summary report" (PDF). Marketing Communications and Audiences. August 2008. Retrieved 2009-05-28.
- Murphy, Andrew (2009-02-18). "The Plymouth Digital Radio Mondiale (Drm) Trial - Long-term Reception Results" (PDF). British Broadcasting Corporation - Research and Development. Retrieved 2009-05-28.
- "Digital medium wave trial report". British Broadcasting Corporation. 2009-05-20. Retrieved 2009-05-28.
- "Mobile media test at Stoke (T-DMB and DAB-IP service)" (PDF). National Grid Wireless. Archived from the original (PDF) on 15 June 2007. Retrieved 2007-04-19.
- "National Grid Wireless begins DAB-IP and T-DMB trial". National Grid Wireless. 2006-09-09. Archived from the original on 8 February 2007. Retrieved 2007-04-19.
- "Country Information for DAB, DAB+ and DMB - United Kingdom". World DMB. Archived from the original on 1 December 2008. Retrieved 2009-02-21.
- "United Kingdom & the Isle of Man". Wohnort. Retrieved 2009-02-21.
- Plunkett, John (2009-01-29). "Digital Britain: Government to make DAB 'primary network' for radio". London: The Guardian. Retrieved 2009-01-29.
- "Digital Britain - the interim report" (PDF). BBC. Department of Culture, Media and Sport. 2009-01-29.
- Parsons, Russell (2009-09-22). "Radio unites to prepare for digital upgrade". mad.co.uk. Retrieved 2009-09-22.
- "Digital Britain - Chapter 3b: Radio: Going Digital" (PDF). Department of Culture, Media and Sport. 2009-06-16. Retrieved 2009-06-16.
- Barnett, Emma (2009-11-20). "Digital Economy Bill: No date for radio digital switchover". London: The Telegraph. Retrieved 2010-03-14.
- "'Scrappage' scheme launched to boost digital radio". BBC News. 2010-05-20. Retrieved 2010-05-22.
- Revoir, Paul (2010-11-30). "Lifeline for FM radio as digital switchover is delayed to 2017". Daily Mail. Retrieved 2010-11-30.
- "Way forward for digital radio agreed". Department for Culture, Media and Sport. 2012-07-02. Retrieved 2012-07-04.
- "DAB Memorandum of Understanding signed". Radio Today. 2012-07-02. Retrieved 2012-07-04.
- "Cost-Benefit Analysis of Radio Switchover" (PDF). Department for Culture, Media and Sport. 2012-07-02. Retrieved 2012-07-04.
- "THE RADIO AUTHORITY : ITS LICENCES AND LICENSING PROCEDURES". Ofcom. Radio Authority. Retrieved 2007-05-05.
- "TV Licensing - Digital terrestrial television". Ofcom. Retrieved 2007-05-12.
- "Broadcasters". Digital Radio Development Bureau. Retrieved 2008-02-25.
- "HOW TO SECURE YOUR CAPACITY". Eutelsat. Archived from the original on 15 February 2008. Retrieved 2008-02-25.
- "How to Launch A Channel". SES Astra. Archived from the original on 22 February 2008. Retrieved 2008-02-25.
- "Frequently asked questions about UK Radio". RadioAndTelly.co.uk. Retrieved 2007-02-25.
- "RADIO AUTHORITY ANNOUNCES ADVERTISEMENT DATE FOR NATIONAL COMMERCIAL MULTIPLEX". Ofcom. Radio Authority. 1998-03-05. Retrieved 2007-05-05.
- "RADIO AUTHORITY RECEIVES ONE APPLICATION FOR FIRST AND ONLY NATIONAL COMMERCIAL DIGITAL MULTIPLEX LICENCE". Ofcom. Radio Authority. Retrieved 2007-05-12.
- "ANNEX - PART I - Conditions relating to simulcast services and digital sound programme services". Ofcom. Archived from the original (doc) on 28 November 2007. Retrieved 2007-05-12.
- Plunkett, John (2009-04-07). "Global Radio sells Digital One to Arqiva". London: The Guardian. Retrieved 2009-05-02.
- "Digital One arrives in Northern Ireland". Radio Today. 2013-07-26. Retrieved 2013-07-26.
- "Extending DAB Services in Northern Ireland - Request to extend coverage area of national radio multiplex service." (PDF). Ofcom. 2013-02-14. Retrieved 2013-07-26.
- "Browse directory of Digital Multiplexes". Ofcom. Radio Authority. Retrieved 2007-05-05.
- "RADIO AUTHORITY AWARDS FIRST LOCAL DIGITAL MULTIPLEX LICENCE, FOR BIRMINGHAM". Ofcom. Radio Authority. 1999-10-15. Retrieved 2007-05-05.
- "Ofcom set to advertise new DAB muxes". Digital TV Group. 2006-10-25. Retrieved 2007-04-16.
- "Oxfordshire DAB advertised". Radio Today. 2007-05-09. Retrieved 2007-05-09.
- Paine, Andre (2010-02-10). "Race Against Time For U.K. Digital Bill". Billboard. Archived from the original on 30 March 2010. Retrieved 2010-03-14.
- "DAB coverage planning: report to Government". Ofcom. 2012-05-01. Retrieved 2012-05-01.
- "DAB Ensembles Worldwide - United Kingdom & the Isle of Man". Retrieved 2007-05-05.
- "RADIO AUTHORITY AWARDS LOCAL DIGITAL MULTIPLEX LICENCE FOR CENTRAL SCOTLAND". Ofcom. Radio Authority. 2000-10-06. Retrieved 2007-05-05.
- "Yorkshire". Ofcom. Retrieved 2014-09-17.
- "Radio in Digital Britain" (PDF). Ofcom. 2009-03-27. Archived from the original (PDF) on 10 July 2009. Retrieved 2009-05-02.
- "Regional MXR digital multiplexes to close". Radio Today. 2012-09-25. Retrieved 2012-09-25.
- "GCap bottle out of taking Ofcom to court". Digital Radio Tech. 2006-03-30. Retrieved 2007-04-21.
- "Advertisement of National Radio Multiplex Licence" (PDF). Ofcom. 2006-12-01. Archived from the original (PDF) on 4 February 2007. Retrieved 2007-04-21.
- "Ofcom receives two applications for the DAB National Radio multiplex licence". Ofcom. 2007-03-29. Retrieved 2007-04-15.
- "Second UK-wide national DAB digital radio multiplex draws two applicants". Radio-now.co.uk. 2007-04-15. Retrieved 2007-05-05.
- "The Services". 4 Digital Group. Retrieved 2007-05-05.
- "List of Applications for Radio Multiplex Licence: National". Ofcom. 2007-03-30. Archived from the original on 9 July 2007. Retrieved 2007-05-05.
- "4 Digital group awarded new national digital radio multiplex licence". Ofcom. 2007-07-06. Retrieved 2007-07-06.
- Sweney, Mark (2008-10-10). "Ofcom in talks to prevent digital radio crisis". London: The Guardian. Retrieved 2009-01-27.
- "Advertisement of National Radio Multiplex Licence" (PDF). Ofcom. 2014-07-01. Retrieved 2014-07-01.
- "Two horse race for Digital 2 DAB multiplex". a516digital. 2015-01-29. Retrieved 2015-01-29.
- "More digital radio stations on their way to UK listeners". Ofcom. 2015-01-29. Retrieved 2015-01-29.
- Martin, Roy (2015-01-29). "Two bidders for D2 – here's what we know". Radio Today. Retrieved 2015-01-29.
- "Applications for National Radio Multiplex Licence". Ofcom. 2015-02-03. Retrieved 2015-02-03.
- Martin, Roy (2015-01-29). "Orion Media partners with Babcock for D2 bid". Radio Today. Retrieved 2015-01-29.
- Martin, Roy (2015-01-29). "Sound Digital plans the return of Virgin Radio and talkRADIO". Radio Today. Retrieved 2015-01-29.
- Martin, Roy (2015-03-27). "Sound Digital wins national DAB multiplex". Radio Today. Retrieved 2015-04-20.
- "Stations". Listen2Digital. 2015-01-29. Retrieved 2015-01-29.
- "15 exciting new national radio stations expanding choice for listeners". Sound Digital. 2015-01-29. Retrieved 2015-01-29.
- "Trial small scale DAB licensing". licensing.ofcom.org.uk. Retrieved 2015-09-06.
- "Small scale DAB trial licence awards statement" (PDF). Ofcom. Retrieved 2015-09-06.
- "Trial small scale DAB licensing". Ofcom. Retrieved 2016-09-11.
- Coinchon, Mathias (2015-06-12). "Sixty small-scale radio stations take to the air in UK Ofcom trials | Opendigitalradio.org". www.opendigitalradio.org. Retrieved 2015-09-06.
- "Sixty small-scale radio stations take to the air in Ofcom trials". media.ofcom.org.uk. Retrieved 2015-09-06.
- "Small Scale DAB Trials - Final Report". Ofcom. Retrieved 2016-09-26.
- "Digital radio company to prepare UK for switchover". Broadcast. 2009-09-22. Retrieved 2009-09-22.
- Plunkett, John (2009-09-22). "Details of digital radio switchover body revealed". London: The Guardian. Retrieved 2009-09-22.
- "Digital Radio UK to lead the way". Radio Today. 2009-09-22. Retrieved 2009-09-22.
- "Consumers". Digital Radio Development Bureau. Retrieved 2007-04-21.
National and regional multiplex sites operators
Small scale multiplex sites operators
UK Internet radio
- DAB Ensembles Worldwide (also known as "Wohnort", the main part of the site is a list of services currently transmitting including the UK), wohnort.org
- Radio-now - UK Digital radio news and information
- LocalDAB - Services on the trial DAB ensembles