NI DTT

Michael Watterson's picture

DVB-T2 Lite

DVB_T2-logo The DVB Project has published details of a new profile for its terrestrial broadcasting standard, designed to support low capacity applications such as mobile broadcasting.

Version 1.3.1 of the Blue Book for DVB-T2 adds the new T2-Lite profile. At the same time the previous single profile has been renamed as the T2-base profile.

According to the DVB, T2-Lite is based on a limited sub-set of the modes of the T2-base profile, and by avoiding modes which require the most complexity and memory, allows much more efficient receiver designs to be used.

One possible use for T2-Lite enables the simulcasting of two different versions of the same service, with different bit-rates and levels of protection, which would allow better reception in fringe areas.

Download the specification here (DVB.org)

Development of DVB-h as mobile standard has basically been abandoned. It's unknown how this relates to the DVB-T2 "Lite" mux discussed for deployment of RTE/TG4 services in N.I. 

lawhec's picture

Receiving Freeview in the Republic post-DSO in Northern Ireland

If you are receiving analogue television from across the border in Northern Ireland (BBC1, BBC2, UTV, Channel 4, possible Five in a few places), you should be aware (if you're not already) that these transmissions will cease in about two years time (at the time of writing, shutdown likely to be the second half of 2012) to be replaced with high-powered digital services, known in the UK as Freeview.

The question then lies as to if the current aerial pointing into the North will be good enough? Fortunately there is a "rough" test that was developed by engineers at BBC Research & Development using teletext to see if your current aerial should be suitable after the analogue signals are closed down.

As of this moment, none of the main transmitters in the North nor any of its relays except one should require a new aerial installation for this switch over although some of the relays are moving to new frequencies within the same aerial group (Kilkeel and Gortnalee are two that may affect viewers in the Republic), so to test wherever your analogue reception is strong enough to receive at least some DTT services from N.I. after the analogue signals are terminated, do the following...

*** Please note, this test is no good if your analogue signals are coming from a "deflector" ***