3 posts • joined Monday 23rd November 2009 15:23 GMT
The cable operators have no license to any spectrum
Cable operators could and should have ensured that all user equipment was protected. This involves using quality coax - cable and connectors. It is likely that the 4 channels 66-69 (30 MHz) will not be able to carry any analogue TV. They may also have reduced capacity for digital muxes or internet. This is a very small restriction 30 MHz out of 600-650 MHz..
The cable operators have no license to any frequency - they have to remain inside their cables. The same problem will emerge if/when cable operators extend the top frequency used from 862 MHz to say 1 GHz. GSM and LTE using GSM900 frequencies will give the same type of problems in the 900 MHz band (880-915 MHz =GSM-upload).
They did not enforce the rules of fully shielded coax and quality TV's - when it wasn't strictly needed - but this is the cable operator's own problem - end of story.
DVB-T2 will provide 67% higher bitrate in the UK.
@Mage "The Neotion is a stop-gap solution for Countries with some DVB-T TVs that do MPEG2 and have launched DVB-T MPEG4 SD TV, New Zealand, Estonia, Ireland, France. About 20 countries."
"The Neotion "CAM" does however work with Irish test transmissions, but not on all models of TVs."
Neotion does not support HE-AAC audio that is used in Denmark, Norway and will be used in Sweden, Finland shortly.
HE-AAC audio is part of the Irish spec. too. The Irish tests are, however, currently being broadcast using MP2 audio.
@Mage"Frankly I'm sceptical about the claimed 60% saving of DVB-T2 compared with DVB-T"
But the PSB-3 DVB-T2 HD multiplex will broadcast with 40.2 Mbit/sec from December 2. The other DVB-T muxes will have a bitrate of 24.1 Mbit/sec. 40.2/24.1 = 1.67 = +67%.
This is not just theory - its a proven fact.
The 30% was known to be to low right from the start of the DVB-T2-TM (the technical workgroup) - just not by how much.