further DTT switch ons

Galway

Take a look at http://www.rte.ie/aertel/169-01.html Aertel page 169 - long outages at Maghera and Truskmore in the daytime 10 -11th March.

Might DTT switch on be imminent here?

lawhec

There was no sign of any DTT signals from Truskmore today at least on the frequencies allocated for there that are planned (E52, E53, E56 & E57). Might be worth checking closely tomorrow though.

Galway

Nothing from Maghera yet. Id say Kippure could well the be last tx to get DTT as there's ovelap from Three Rock, Mt Leinster & Clermont Cairn - all broadcast DTT.

TheDriver

Mullaghanish has works which means no analog rte 1 or 2 each morning this week

psham

Just tried dvb on my tv on the off chance that i wouln't have to watch the match with snow all over the screen, and lo and behold.. All rte channels and tv3 in crystal clear digital picture..

The Cush

Galway wrote: »

Nothing from Maghera yet. Id say Kippure could well the be last tx to get DTT as there's ovelap from Three Rock, Mt Leinster & Clermont Cairn - all broadcast DTT.

Kippure and Three Rock will be transmitting as an SFN (Single Frequency Network) sharing channels 54 58 61 64

gtg60

The Cush wrote: »

Kippure and Three Rock will be transmitting as an SFN (Single Frequency Network) sharing channels 54 58 61 64

Oh, that's interesting does that mean it's likely to happen sooner?

I was at my folks yesterday and they get their channels from Kippure (and they're not great) so I was hoping they could go down the DTT route shortly.

The Cush

gtg60 wrote: »

Oh, that's interesting does that mean it's likely to happen sooner?

Don't know, all I can say is all main transmitters (+ Dungarvan and Greystones) are to be rolled out before the end of Q2 2009.
The operation of an SFN may be a little more difficult based on this answer in the submissions to the BCI DTT Multiplex Contracts awards process.

3.8.1.f. How do you propose to ensure that timing and synchronisation are maintained in Single Frequency Networks (SFN)? What is the proposed approach, and rationale for any such approach, for dealing with a situation in which synchronisation of one or more transmitters in an SFN is lost?

It is intended to operate Kippure and Three Rock as an SFN.

The distribution network is locked to a Global Positioning System (GPS) clock sourced from two geographically separate locations. Additionally at SFN stations the SFN adapter is also GPS locked. These facilities are duplicated Thus protecting against loss of synchronisation unless there is a problem with the GPS transmission. In such circumstances the adapter will free run and may drift out of synchronisation over time with the other station(s) in the network. The effect on the ground will be that the areas of constructive and destructive interaction will move. In the extreme it may be necessary to shut down one of the transmitters until the GPS signal is restored. The Global Positioning System (GPS) is the only fully functional Global Navigation Satellite System (GNSS). Utilising a constellation of at least 24 Medium Earth Orbit satellites that transmit precise microwave signals, the system enables a GPS receiver to determine its location, speed, direction, and time. As GPS signals are used for major civil and military operations, it is unlikely an interruption to signals will be of any significant duration.