This page contains details of the current technical parameters for the UK’s digital terrestrial television (DTT) transmitter network.
The information is in spreadsheet format and is intended for ease of download and further manipulation, rather than for presentation.
Television transmitter frequency data (XLSX, 279.6 KB)
Last updated: 30 January 2018
The spreadsheet includes information on the frequencies that the DTT network adopted as part of the 700 MHz clearance programme (which was completed in 2020). Yellow highlighting shows the main changes compared to the pre-700 MHz clearance network.
The "DSO Muxes" worksheet contains data on the six national digital switchover (DSO) multiplexes: PSB1, PSB2, PSB3, COM4, COM5 & COM6.
The "NonDSO Muxes" worksheet contains data on non-DSO multiplexes: COM7, COM8 (see the note in 'Multiplexes' table in the glossary below), the Local TV multiplex (LTVMux), the Northern Ireland Multiplex (NIMux), and Geographic Interleaved Multiplexes (GIMux).
More information about the data contained in the spreadsheet is provided in the glossary below.
While every reasonable effort is made to ensure that the information provided in these documents is accurate, no guarantees for the currency or accuracy of information are or can be made. The information contained in these documents is provided without any representation or endorsement made and without warranty of any kind, whether express or implied.
Please notify significant errors or omissions by email to broadcast.technical@ofcom.org.uk
ITV Region - DSO: The licensed Channel 3 (ITV, STV or UTV) region of the site, used in the digital switchover (DSO) programme in 2008-12.
ITV Regional News Service: The Channel 3 (ITV, STV or UTV) regional or sub-regional service news service carried by this transmitter.
BBC Region: The BBC regional or sub-regional service carried by this transmitter.
Transmitter Group (DSO): A group of sites comprising a Primary Transmitter and its dependent relays.
Site Number (DSO): Reference number for the site.
Site Name: The transmitter site name. In some cases this name may not exactly match the site name used in other sources of DTT transmitter information (see Alternative Form below)
Alternative Form: In cases where other sources of transmitter information (for example international coordination agreements) contain site names which differ in spelling or punctuation from the Site Name above, the alternative form(s) are provided here. The list of Alternative Forms is not exhaustive.
Primary Transmitter? Indicates whether the site is the Primary Transmitter within its DSO Transmitter Group: 1 = Yes; 0= No.
GBNGR: Alpha-numeric Ordnance Survey (GB) National Grid Reference for the site.
GBNGRX / GBNGRY: Numeric Ordnance Survey (GB) National Grid Reference Easting / Northing for the site.
IrishGR: Alpha-numeric Irish Grid Reference for sites situated in Northern Ireland, prefixed by ‘I'. Locations for sites in Northern Ireland are also provided as extended GB National Grid References.
IrishGRX / IrishGRY: Numeric Irish Grid Reference Easting / Northing for sites situated in Northern Ireland.
Site Height: The terrain height of the transmitter location in metres above ordnance datum (mean sea level)
For each site or multiplex the following data is provided:
(Average) Antenna Height: The (mean) height of the antenna/s above ground level (AGL).
Channel: The UHF channel of the service. The centre frequency, Fc (in Megahertz) of the multiplex can be calculated using Fc=8n+306, where n is the UHF channel number.
Offset: A + or - indicates that the frequency is offset by +0.167MHz or -0.167MHz with respect to the channel centre.
ERP: The Effective Radiated Power of the multiplex, in kilowatts (kW)
Aerial Group: Suggested aerial group for reception of the 3 PSB multiplexes (and the 3 COM multiplexes, where broadcast) from this transmitter. The suggested aerial group does not take other co-sited services into account.
| Aerial group | Channels | Colour code |
|---|---|---|
| A | 21-37 | Red |
| B | 35-53 | Yellow |
| C/D | 48-68 | Green |
| E | 35-68 | Brown |
| K | 21-48 | Grey |
| T | 21-60 | White |
| W | 21-68 | Black |
Polarisation: Indicates whether the multiplexes from this site are horizontally (H) or vertically (V) polarised.
Multiplexes
| Multiplex designation | Licence name | Multiplex name | Operator | Transmission mode | |
|---|---|---|---|---|---|
| DSO multiplexes | PSB1 | Multiplex 1 | BBC A | BBC | DVB-T: 64 QAM, code rate 2/3, 8K FFT |
| PSB2 | Multiplex 2 | D3&4 | Digital 3 & 4 | DVB-T: 64 QAM, code rate 2/3, 8K FFT | |
| PSB3 | Multiplex B | BBC B | BBC | DVB-T2: 256 QAM, code rate 2/3, 32K FFT | |
| COM4 | Multiplex A | SDN | SDN | DVB-T: 64 QAM, code rate 3/4, 8K FFT | |
| COM5 | Multiplex C | Arqiva A | Arqiva | DVB-T: 64-QAM, code rate 3/4, 8K FFT | |
| COM6 | Multiplex D | Arqiva B | Arqiva | DVB-T: 64-QAM, code rate 3/4, 8K FFT | |
| Non-DSO multiplexes | COM7 | Multiplex E | COM7 Arqiva 'interim' multiplex | Arqiva | DVB-T2: 256 QAM, code rate 2/3, 32K FFT |
| COM8 | Multiplex E | COM8 Arqiva 'interim' multiplex (COM8 closed in June 2020) | Arqiva | DVB-T2: 256 QAM, code rate 2/3, 32K FFT | |
| LTVMux | Multiplex L | Local TV multiplex | Comux UK Ltd. | DVB-T: QPSK, code rate 3/4, 8K FFT | |
| NIMux | Multiplex Northern Ireland | Northern Ireland multiplex | Multiplex Broadcasting Services N.I. Ltd. | DVB-T2: QPSK, code rate 2/3, 32K FFT | |
| GIMux | Manchester GI Multiplex | Geographically Interleaved Spectrum multiplex (Manchester) | Entertainment Television Ltd. | DVB-T: 16QAM, rate 3/4, 8K FFT | |
| GIMux | Cardiff GI Multiplex | Geographically Interleaved Spectrum multiplex (Cardiff) | Cube Interactive Ltd | Not currently on-air |