UK Digital Television Transmitter Details

Technical details for the UK's digital terrestrial television (DTT) transmitter networks. Includes the locations, transmission frequencies and powers of DTT transmitter sites

Technical details for the UK's digital terrestrial television (DTT) transmitter networks. Includes the locations, transmission frequencies and powers of DTT transmitter sites.

This page contains details of the technical parameters for current digital terrestrial television transmitter allocations in the UK.

The data is in spreadsheet format and is intended for ease of download and further manipulation, rather than for presentation.

Complete Frequency Data (Microsoft Excel Workbook)

Alternatively, the data contained in this Excel file is available in CSV format below:
DSO Multiplexes (CSV) Contains data on the six national digital switchover (DSO) multiplexes: PSB1, PSB2, PSB3, COM4, COM5 & COM6.

Non-DSO Multiplexes (CSV) Contains data on non-DSO multiplexes: COM7, the Local TV multiplex (LTVMux), the Northern Ireland Multiplex (NIMux), and Geographic Interleaved Multiplexes (GIMux).

Data last updated 17|11|2014

A glossary containing explanations of the column headings is provided below.

This data will be updated from time-to-time to correct any errors and to reflect future changes to the networks. Please notify significant errors or omissions by email to broadcast.technical@ofcom.org.uk


Disclaimer: 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.

Glossary:

ITV Region - DSO: The licensed Channel 3 (ITV, STV or UTV) region of the site, used in the digital switchover (DSO) programme.

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
W 21-68 Black

Polarisation: Indicates whether the multiplexes from this site are horizontally (H) or vertically (V) polarised.

Multiplexes:

Multiplex Designation Multiplex Name Operator Transmission Mode
DSO Multiplexes:      
PSB1 21-37 BBC DVB-T: 64 QAM, code rate 2/3, 8K FFT
PSB2 35-53 Digital 3 & 4 DVB-T: 64 QAM, code rate 2/3, 8K FFT
PSB3 48-68 BBC DVB-T2: 256 QAM, code rate 2/3, 32K FFT
COM4 35-68 SDN DVB-T: 64 QAM, code rate 3/4, 8K FFT
COM5 21-48 Arqiva DVB-T: 64-QAM, code rate 3/4, 8K FFT
COM6 21-68 Arqiva DVB-T: 64-QAM, code rate 3/4, 8K FFT
Non-DSO Multiplexes:
LTVMux Local TV Multiplex* Comux UK Ltd. DVB-T: QPSK, code rate 3/4, 8K FFT
COM7 Arqiva 600 MHz Multiplex* Arqiva DVB-T2: 256 QAM, code rate 2/3, 32K FFT
NIMux Northern Ireland Multiplex Multiplex Broadcasting Services N.I. Ltd. DVB-T2: QPSK, code rate 2/3, 32K FFT
GIMux Geographically Interleaved Spectrum Multiplexes (Manchester & Cardiff) Canis Media (Manchester)
Cube Interactive (Cardiff)
At licensees' discretion. Cardiff allocation not currently in use.

*Includes planned sites which are not yet on-air.
Phase 2 local TV sites and COM8 600 MHz sites are not currently listed in this spreadsheet.