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I have added information to the UK Free TV database to cover the so-called mini-multiplex that will carry three Irish channels, TG4, RTE1 and RTE2 in a very special multiplex from three transmitters in Northern Ireland.
However, you will not be able to view these services using a standard-definition Freeviewreceiver - a Freeview HD box or set will be required. It is not known at this time if the NIMM will carry RTE2 in HD, as per the Saorview service. TG4 and RTE1 are broadcast in standard definition at the moment.
Ronan o dwyer: Analogue switch-off on the island of Ireland is not until 24 October. All four services are still broadcasting from Three Rock, RT?? One on C29, RT?? Two on C33, TV3 on C35 and TG4 on C55, all at 25 kW. Three Rock broadcasts the first Saorviewmultiplex on C54 at 63 kW, quite an increment when digital services are usually considered equivalent at one-fifth to one-tenth the power of analogue!
We don't yet know which channel will be used, unfortunately, so you may have to gamble on wideband.
If you're the same Iderown on Boards.ie, you should be good to stick with your Group C/D on Clermont Carn. Saorview from there will be 160kW digital after analogue switch-off, which is approximately equivalent to 800kW analogue using the scaling factors that the UK uses to set the digital power level. The current analogue output at Clermont Carn is 250kW. Saorview signals are currently restricted to the north, that restriction is lifted on 24 October. It will replace RT?? One on C52, so if you have good reception of that already, you'll probably get good results from Saorview directly.
Thank you for that Mike Dimmick. Yes, I am the same Iderown. Reception from Clermont Carn (analogue) is marginal to reasonable at Bangor (North Down).
I will most likely hedge the bets, leave the group C/D (V) aerial on the chimney, and keep the diary empty for a few days at the end of October!
It will be an interesting time.
Three channels - RTE One, Two and TG4 - will be available.
Freeview delivery of the channels will be supplemented by overspill coverage from Saorview, its equivalent in the Republic.
Digital switchover is to be completed in Northern Ireland on 24 October of this year.
Minister of State for Northern Ireland Hugo Swire said:"This announcement is the culmination of a great deal of work involving the UK and Irish governments, the broadcasters themselves and the regulatory bodies.
"I'm pleased to welcome this important practical step, which will increase the coverage of RTE1 and 2 and importantly of TG4 following digital switchover later this year."
Communications Minister Ed Vaizey said: "I'm delighted that the digital future for TG4, RTE One and RTE Two in Northern Ireland is now strengthened and secure.
"Today's announcement is good news for viewers and continues our delivery on commitments set out in the Good Friday agreement."
Irish Minister for Communications Pat Rabbitte added: "This announcement means that from Analogue Switch-off on 24 October, over 90% of viewers in Northern Ireland will be able to receive TG4 and the two primary RTE channels in digital.
"It is a hugely positive result in terms of practical cooperation resulting from the Good Friday Agreement."
No information on the Guard Interval, but since the obvious pairing of Carnmoney Hill and Black Mountain are on different frequencies, I expect it'll be 1/128. Similarly it will probably use Pilot Pattern 7 to match the HD mode. The recommended configuration in the DVB-T2 Implementation Guide gives 9.954 Mbit/s (the frame lengths can also be altered in T2). Using this mode requires 2.6 - 2.8 dB less signal, compared to the noise level, than the 16QAM 1/2 mode previously suggested, and 14.7 - 15.8 dB less than the HD mode. That's equivalent to broadcasting at 29.5x - 38x the power of the HD mux.
The change in mode could be down to the power level permitted at Brougher Mountain, which is half that previously indicated (i.e. 3 dB less).