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Freeview modes

Four of the Freeview multiplexes (collections of channels) broadcast in one mode known as "16 QAM (3/4)", and the other two broadcast in another mode called "64QAM (2/3)".

Four of the Freeview multiplexes (collections of channels) broa
published on UK Free TV

Two of the Freeview multiplexes (collections of channels) broadcast in one mode known as "64QAM mode, FEC=2/3,", and the other three broadcast in another mode called "64QAM mode, FEC=3/4".

The " FEC=2/3" mode provide a more reliable signal than a "FEC=3/4" mode signal at the same power level, but there is a trade-off that means less digital data can be carried.

This diagram shows the current channels carried on the Freeview system. The wider the box, the more bandwidth is used to carry the pictures. The more bandwidth used for a service, the better the picture quality.

Boxes split horizontally denote channels that occupy the bandwidth at different times of the day.





The third line shows the configuration of the BBC "B" multiplex switchover which is used for HD and is in another mode DVB-T2 256QAM.

64 QAM (3/4) mode

In this mode, the digital TV signal is transmitted in groups of 64 symbols. The "forward error correction" is 2/3, and this results in a bitrate of 24M.1b/s (megabits per second). This can be used to carry up to eight simultaneous television channels.

64 QAM (2/3) mode

In this mode, the digital TV signal is transmitted in groups of 16 symbols. The "forward error correction" is 3/4, and this results in a bitrate of 27.1Mb/s. This can be used to carry ten simultaneous television channels.

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Comments
Thursday, 13 January 2011
Monday, 7 February 2011
T
Tina Bevan
3:05 PM

I have freeview built into my downstairs television (with sky, Wii etc) and the upstairs television. In the last week both have lost pretty much everything except BBC. What should I do?

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Tina Bevan's 1 post GB flag
Briantist
sentiment_very_satisfiedOwner

3:12 PM

Tina Bevan: Can you first see the suggestion on the Freeview reception has changed? | ukfree.tv - independent free digital TV advice page?

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Briantist's 38,910 posts GB flag
Sunday, 13 February 2011
C
colin hayes
12:05 PM

Hi,

I have two separate freeview boxes same make etc

when I rescanned one as a first installation I lost several channnels

both use the same ariel, ITV and full channels show on the origianl but not the rescanned one

manual rescanning brought back several of these channels

however, I cannot find a current list that informs me what TV channels are transmitted on what scanning channels on the crystal palace transmitter

I suspect that if I find the correct scanning channel ITV will come back

Any Ideas

Thanks

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colin hayes's 1 post GB flag
Monday, 14 February 2011
D
darren
12:14 PM

Hey i have a problem with my new freeview box its got a a video and dvd in it but every day i turn it on it comes up with a page across the middle of the screen ttat says New Channel Found, so i do a rescan only to find nowt new plus it cancels all my programme timers its really getting to me now ! Does anyone here have a ideal what the problem could be !I am not that happy really with the Freeview service anyway it seems to be turning into a free service to dump soft porn channels on now !

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darren's 16 posts GB flag
Wednesday, 16 February 2011
M
Mike
10:08 AM
Scarborough

Me again, I have tried resetting the tv back to manufactureres settings switched off all possible interferences. But the tv still only has 17 DTV channel, uhf ch 24 still shows a yellow warning triangle when i go into diagnostics on the telly.Any other ideas. Thanks again

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Mike's 1 post GB flag
Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Briantist
sentiment_very_satisfiedOwner

1:48 PM

Mike: Have you seen the Single frequency interference | ukfree.tv - independent free digital TV advice page? You should have near-perfect reception from Bilsdale with a rooftop aerial.

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Briantist's 38,910 posts GB flag
Thursday, 17 February 2011
N
nikki
9:57 PM

hey this may sound really silly.... there are 3 tellys in my house all with bulit in freeview and all conected to the same aerial... the telly downstairs is a samaung and the one in the room next to me is acoustic solutions they get more channels then i do and there tellys dont pixelate on all channel 5's and itv's.... my telly is a logic... is there any reason only my telly dosent receive channels theres do and pixelats when thers dont????

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nikki's 1 post GB flag
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