Freeview modes
Brian Butterworth 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.Help with Television sets?
Wednesday, 12 September 2012
S
shirley6:57 PM
i have a 10 month old LG tv with built in freeveiw after retuning for the switchover my channels are all mixed up and i only have 13
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shirley: If you could not get Freeview before switchover, then the only channels you will have now are the BBC ones. Without knowledge of where you are it is difficult to give any answer.
Which channels are you referring to being in the wrong order? Is it BBC One analogue that now appears on analogue button 2?
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Sunday, 16 September 2012
T
tracey11:33 AM
Middlesbrough
I have lost my itv and other channels. I have tried auto tuning it a few times but am still missing a few channels. Please help. My postcode is ts6 8ar.
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tracey's: mapT's Freeview map terrainT's terrain plot wavesT's frequency data T's Freeview Detailed Coverage
M
Mark Fletcher8:35 PM
Halifax
Tracey.Middlesborough,TS6 8AR.
Are you receiving programming from Pontop Pike most likely,or less likely Bilsdale mast ?
You may have to reset your affected appliance as such by unplugging from mains,unplug aerial then 1 minute later re-plug in the appliance concerned and leaving the aerial out still do a full auto scan,the result nothing is picked up by clears your appliances memory.Now replug aerial back in and if the affected appliance allows this time perform manual scanning it should work.
As far as analogue is concerned only BBC2 analogue so far has gone forever,BBC1 analogue as relocated to frequency 64 but this along with ITV1,Channel 4 AND Channel 5 analogue will all go for good in the early hours of Wednesday 26 September 2012,DSO2.
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Thursday, 25 October 2012
D
Debbie12:20 PM
Beckenham
As Tracy comments, I did a retune to try and get back ITV2 + 1, however since then I cannot get any ITV channels (apart from ITV2 +1!), Channel 4, 5 and many other ones. I have tried retuning a few times but still the same. The TV has built in freeview. My postcode is BR3 3JQ - how can I get those channels back?
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Debbie's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
Debbie: If your receiver allows manual tuning, then do a manual scan of UHF channel 26.
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Friday, 16 November 2012
J
John Smith5:54 AM
Ever since the beginning of November I have lost many of my Channels ( itv3, itv4, viva, film 4, yesterday,47 etc). I have tried retuning and swapping televisions to no avail. The reception on channels that remain is poor, with frequent pixelation and loss of picture. I live in
SP 5, which I believe is knighthood for poor reception. I would appreciate any advice .
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Tuesday, 27 November 2012
M
Martin Lucas2:21 PM
Since switchover my ITV and Channel 4 programmes are breaking up. The picture becomes pixiliated and the sound is intermittant. I live in Belper, DE56 and tune into the Sutton Coldfield transmitter. I've tried to manually tune to channels 46, 39, 42, 43 & 45, but still the same result. My TV is a JVC and I can only enter the frequency not the channel number. Can you help?
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Martin Lucas: Each channel number has a frequency in MHz and these are shown on the transmitter page, so follow the link to Sutton Coldfield.
Belper has its own transmitter (again, click the word Belper to see its frequencies) so you could always be tuned to that instead. It uses higher channels so you may be able to avoid it by unplugging the aerial near the end of the scan.
Belper is a relay of Waltham and therefore provides East Midlands programming.
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A
Adam B3:23 PM
Martin Lucas:
Channel number to MHz conversion:
Multiply by 8 and then add 306.
Example CH46
46 * 8 = 368 then + 306 = 674 MHz.
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