Llanddona Transmitter Group

The Llanddona transmitter and its 22 relays, serving north west Wales, completed the digital switchover on 21 October 2009 and 18 November 2009.

Digital switchover (DSO) complete at Llanddona transmitter group

The Llanddona transmitter and its 22 relays serving north west Wales made the switch in two stages:

At Stage 1 (DSO1) - 21 Otober 2009
BBC Two analogue ceased broadcasting permanently and the first BBC multiplex, Mux BBC A, launched at 8k and 64QAM.

At Stage 2 (DSO2) - 18 November 2009
All other analogue services ceased broadcasting permanently and high powered digital multiplexes launched at 8k and 64QAM.

For futher information on 8k and 64QAM transmission modes please click here.

The Llanddona transmitter group relays are:

Amlwch	Arfon	Bethesda
Bethesda North	Betws y Coed	Caergybi
Caernarfon	Cemaes	Coed Derw
Conway	Deiniolen	Dolwyddelan
Ffestiniog	Gronant	Llandecwyn
Llanengan	Llanddona	Maentwrog
Mochdre	Morfa Nefyn	Prestatyn
Trefor B	Waunfawr

Ofcom DSO transmitter details

Published by Ofcom, these documents contain details of transmission characteristics (channel allocations, ERPs, aerial groups and offsets) which will be adopted post digital switchover. This information is subject to change and therefore should be checked regularly.

To view the Ofcom Digital Swithover transmitter details for this and other regions please visit the Ofcom website.

Ofcom transmitter location maps

Published by Ofcom, these maps detail transmitter locations and DSO transmitter groupings. This information can change and therefore should be checked regularly.

To view the Ofcom transmitter location map for this and other regions please visit the Ofcom website.

Self Helps in the Llanddona transmitter group

Ofcom has confirmed that there is 1 analogue self help, in the Llanddona transmitter group. It's status is as follows:

Cwm Penmachno - owners have not yet applied for a digital license.

For further information about self helps please visit the Ofcom website.

Aerials, group changes

At Llanddona, a group C/D antenna is currently required to receive the analogue and PSB services, in order to recieve the commercial multiplexes, a Group E or W antenna may be required post switchover. Some households may find that their existing analogue antenna works satisfactorily because the commercial multiplexes use channels which are below the analogue group.

At all relay sites, all multiplexes will be within the analogue aerial group from switchover.

Aerials, communal systems

Channel changes at Cemaes, Coed Derw and Conway mean that channelised aerial systems will need to be reconfigured at DSO1 and DSO2.

Adjacent transmitter groups

A household in north west Wales is most likely to be watching the Llanddona transmitter group. However, they could also be watching the Winter Hill, Moel y Parc, Blaenplwyf or Preseli transmitter groups.