All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Paul: DVB-T does not have a "pilot carrier", it is 6,817 or 1,705 sub-signals using a 16- 64- or 256- quadrature amplitude modulation and is thus a "digital signal".
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Dave Lindsay: Yes, the grouping system was introduced because no-one expected UHF television signals to go "over the horizon".
In the early days of UHF television, there was some surprise at what is called here "The Inversion Effect" - What is the Inversion Effect and why does it effect my Freeview TV reception?
| ukfree.tv - independent free digital TV advice .
So, to prevent interference during conditions that cause atmospheric ducting (because there are considerable problems with analogue and co-channel interference) the group system was introduced.
Co-channel interference is practicably eliminated by COFDM, the grouping system is is a redundant analogue legacy.
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Mark: Have you checked What does "Full HD Ready" actually mean? | ukfree.tv - independent free digital TV advice ?
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Ian Grice: Not really, as the 600MHz band has been cleared these new services will have no impact on existing allocations.
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trevorjharris: The BBC want to replace the "BBC HD channel" with BBC TWO, BBC three and BBC FOUR HD, so the BBC do need more capacity.
ITV2, ITV3, ITV4, E4 and Film4 are already broadcasting.
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Dave Lindsay: That's the general problem with analogue signals, in that they can both shift up and down frequencies when they are reflected and refracted, plus the also have side-band effects.
This is why all analogue channels were allocated at least two channels apart on each transmitter, but it's fine for two COFDM signals to occupy consecutive channels.
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trevorjharris: 99% the content the BBC uses is already produced and delivered in HD, providing BBC three and BBC FOUR in HD. *ALL* BBC TWO content has been made in HD for over a year. BBC - Commissioning - TV & Multiplatform
The BBC simply needs bandwidth to provide the channels, not content delivery.
Sky are prevented by Ofcom from providing Sky Sports on Freeview themselves following a review.
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More at COM7, COM8 and COM9 part II - which transmitters are "in group" | ukfree.tv - independent free digital TV advice .
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Saturday 24 September 2011 1:39PM
john Matthews: Thank you for your kind comments, it always make it seem worthwhile when I know people have been assisted.
I'm very happy to hear you finally have a fully working Freeview system.