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ITV Digital in ROI
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Irishblimp, if you're receiving Brougher Mt. analogue at 50dB with a mast-head amp, it's fairly certain you haven't a hope of getting Digital. Don't forget that the Digital signals are transmitted 23dB lower than the Analogue (to avoid causing interference to other transmitters such as Holywell Hill), and that a typical STB requires a clean, unamplified signal of at least 28dB before it will BEGIN to lock up. Also. it's usual to add 6-8dB to this to allow for fading, reflections and other seasonal factors, giving you a figure of about 35dB. Using a mast-head amp only degrades these levels even further. Typically, you would need to be getting about 45dB output from an amp (or about 20dB input) to have any hope of receiving digital and even at that you'ed be pushing your system to the limit!
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"One thing that does make me wonder is how will UK DTT suddenly disappear in ROI when our DTT takes off? How can one DTT suddenly wipe out the other especially if ROI mast was in 1 direction with UK DTT in another direction?"
To answer Irish Blimps question ( above) at least in part.
On analogue presely in Arklow to give a specefic example , you get heavy co channel from Cairn hill , which is travelling on a much different path to presely but is eight times stronger erp - it still gets through the wicklow mountains and makes its presence felt on analog pictures in arklow.
So applying this to Digital
I would say a 50 kw signal with nothing in its way will wipe out a 0.5 signal from Wales
furthermore to recieve ITV digital from Wales properly you need an outdoor aerial and amp - this aerial is 100% likely to pick up a 50kw erp signal regardless of where your aerial is pointed ,thereby wiping out the uk mux on the same channel.
The only exception to this I can see is of course if the offending irish dtt transmitter is blocked out by the hills around you.
Cableskeptic what do you think?
Proof positive of all this btw in the Arklow area is the fact that most people there didn't have to buy an additional aerial toreceive tv3/tg4 as it comes in perfectly with no ghosts on their arfon/presely aerial.
mm
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