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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.

Help with Television sets?
What connections are used from set top box to TV (such as SCART) ?1
If you have several TVs at home do you need separate decoders for each set or is2
Can I use a Freeview box if there is no SCART connector on my TV?3
My TV is NICAM, does that mean I have digital TV?4
Why has my widescreen TV just made everyone look fat?5
In this section
Loft aerials1
Do I need to buy a booster?2
How to receive Freeview on your PC3
Indoor aerials4
Whole house digital TV5
Connecting it all up6

Comments
Friday, 11 July 2014
J
Jackson G
9:14 PM Newcastle Upon Tyne

Hi there.
Model Code - PS43F4500.
Did aerial test and no shut down whatsoever.
However, checking signal fascinating. When we measure the signal strength, the TV does not shut down when on the problem channels. We had the signal measured on e4 for 5mins. As soon as we closed it, the TV restarted.
Also, don't know if it's relevant but when changing to these channels the bit error rate spikes to 2000 for a second or two.
We actually had the TV replaced for this reason originally, so I guess this is the aerial?
We are Ne3 1bj, in Gosforth.
Your help is so much appreciated!

link to this
Jackson G's 6 posts GB
Jackson's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
J
Jackson G
9:15 PM

Signal strengths changed somewhat- all at 58-63 bar e4 + 1 which is 22.

link to this
Jackson G's 6 posts GB
Saturday, 12 July 2014
J
jb38
3:02 PM

Jackson G: The aspect of your problem that's still inclined to suggest its being caused by software defect is the fact of the TV shutting down when certain channels containing a 4 are selected, as virtually nothing you might try should result in this happening except when possibly connected with software updating, a TV shutting down / restarting on completion of same being the norm, but which in this particular instance is not applicable.

On the issue of the software, although the full model number of your TV is really required (that is including five letters after 4500) it would appear that the software version on your model should be 1027.2 issued on December 14th 2013 to replace the older 1027.1, maybe you could go into the software updating screen and check the number that's listed!, if though by any chance you do have version 1 (or older) then the snag is that the update can only be achieved via a download from Samsung's site into a USB memory stick, this then downloaded into the TV via its USB socket.

On the subject of the error rate spiking during channel changing onto the problem channels, if this is only observed when those channels are involved then its symptomatic of a problem being detected with same, although I wouldn't attach too much importance to this as its liable to occur on other devices that are not suffering from any problems.

However, as far as signal strengths are concerned, could you confirm that your aerial is horizontally mounted and that you are receiving Freeview from the Pontop Pike transmitter (@ 11.5 miles / 213 degrees? and its not vertically mounted to suit Fenham @ 2.9 miles / 225 degrees? this station indicated (in theory anyway!) as providing a good signal at your location.

The only reason for enquiring being by you having mentioned e4+1 as being 22, which if referring to strength then OK, other wise Mux C22 is the channel used by Fenham for e4+1.

link to this
jb38's 7,137 posts Platinum Platinum GB
Tuesday, 15 July 2014
J
js
2:34 AM

Jackson G: The files that form the MHEG apps associated with-

D3&4: Film4, More 4, E4 and Channel 4+1

Arqiva B: 4Music, Ideal World, Film4+1, 4seven, RT, Rocks & Co 1

Arqiva A: E4+1, Gems TV

-are identical apart from a "config.txt" file and a few graphics.

One such file is called rogues.lst and contains this text:

lgeD03T14 MHGlge614 DSMlge614 LGE.DTV.MW_MHEG106.DD.GP-3s CIPLUS001
SAMF0201 MHGSAM007 DSMSAM004 SAM-UE28F4000 CIPLUS001 SAMMD2FN4
SAMUS0368 MHGSAM005 DAMSAM003 SAM-PS50C550 INT002001000000 CIPLUS001
SAMUS0368 MHGSAM005 DSMSAM003 SAM-LE32C530 INT002001000000 CIPLUS001
SAMUS0368 MHGSAM005 DSMSAM003 SAM-PS50C450 INT002001000000 CIPLUS001
SAMUS0368 MHGSAM005 DSMSAM003 SAM-UE22C4000 INT002001000000 CIPLUS001
SAMUS0422 MHGSAM005 DSMSAM003 SAM-LE32C450 INT002001000000 CIPLUS001
SAMUS0422 MHGSAM005 DSMSAM003 SAM-UE32C4000 INT002001000000 CIPLUS001
SAMUS0615 MHGSAM006 DSMSAM003 SAM-UE32D4000 CIPLUS001
SAMUS0615 MHGSAM006 DSMSAM003 SAM-UE32D5000 CIPLUS001
SAMUS0834 MHGSAM006 DSMSAM003 SAM-PS43E450 CIPLUS001 SAMMDLE4
SAMUS0834 MHGSAM006 DSMSAM003 SAM-UE32EH4000 CIPLUS001 SAMMDLE4
SAMUS0874 MHGSM006 DSMSAM003 SAM-UE22ES5410 CIPLUS001 SAMMDLE5
SNYbwd SNYLCD032 MHGSNY71S DSMSNY006 MDWSNY000 DRVSNY000 HDWSNY000
SNYbwd SNYLCD032 MHGSNY70S DSMSNY006 MDWSNY000 DRVSNY000 HDWSNY000

SAMF0243 MHEGSAM007 DSMSAM004 SAM-UE32F4000 CIPLUS001 SAMMDLFX4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-UE19F4000 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-UE28F4000 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-UE32F4000 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-PS43F4500 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-PS51F4500 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-PS51F5000 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-PS60F5000 CIPLUS001 SAMMDLFN4
SAMF0311 MHEGSAM007 DSMSAM004 SAM-PS64F5000 CIPLUS001 SAMMDLFN4
SAMC0132 MHEGSAM007 DSMSAM004 SAM-LT22C350 CIPLUS001 SAMMDLFN4


link to this
js's 332 posts Gold Gold GB
Wednesday, 23 July 2014
J
John Martin
8:34 PM Grantham

Hi, Some of our Freeview has completely gone (Yesterday, Dave, Challenge etc.) and the rest is quite pixilated. The same is happening on both our two televisions and I'm worried the whole lot might give up on us soon.

We have just had one of our two freeview DVD/VHS recorders recently repaired. II wonder if that's anything to do with it? Our postcode is NG32 1LP, if that helps.


link to this
John Martin's 10 posts GB
John's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Wednesday, 30 July 2014
J
Jackson G
7:59 AM

Apologies for long response time, we've had Internet problems (to add to
The list!)

Our software is 1014 and when we select update it says it's up to date - I will try download off the Samsung site. The software version is T-NVTF6DEUC-1014.0.

Serial number is B5EW34PD502501V.

Pon top pike is out nearest, but not sure how to check whether it's
Being used?

link to this
Jackson G's 6 posts GB
J
Jackson G
1:20 PM

Having downloaded a new software update from site and installing via USB this seems to have fixed the issue! Can't thank you all enough!

link to this
Jackson G's 6 posts GB
J
jb38
6:58 PM

Jackson G: Excellent news! pleased that the software download has indeed cured the problem.

Thanks also for taking the time to send an update on the situation, as its always nice to know the outcome of any remedial action taken.

link to this
jb38's 7,137 posts Platinum Platinum GB
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