|The original Divis mast. Another mast has been built for DSO|
- TG4 to be switched off early in North Donegal to facilitate stage one of Northern Irish switchover.
Years of planning are about to be put into practice in Northern Ireland as digital switchover enters its first stage overnight tonight.
Just after midnight, BBC Two analogue will be switched off for the final time. BBC Two, which was originally the first channel to be in colour, will become the first of the terrestrial networks to become digital only, when the full powered BBC digital signal is rolled out during the course of tomorrow. The digital BBC service will air on new frequencies, so a retune of Freeview-receiving equipment is required.
Overnight, viewers in Northern Ireland will experience breaks in transmission during engineering work at the transmitters. Viewers receiving from a relay will need to wait longer for the first digital signals to reach them.
All other non-BBC Freeview channels remain on low power and existing frequencies for another two weeks, when the biggest switchover events commence with the final switch-off of analogue signals across the UK and Ireland.
In conjunction with switchover in Northern Ireland, TG4 analogue from the Moville transmitter in the Republic of Ireland is being switched off two weeks earlier than other analogue services in the Republic, to free up UHF channel 50 for BBC services at Limavady transmitter. Affected viewers in North Donegal are already able to receive the Irish digital terrestrial service Saorview, which broadcasts the digital version of the channel.
Read more about the digital switchover in Northern Ireland: