menuMENU    UK Free TV logo Freeview

 

 

Click to see updates

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?
Why are all TVs on sale not digital?1
Do I still have to pay for a TV licence?2
I had perfect channel 5 reception - until I got a digital TV box!3
I Have a Pocket Tv For taking out so I can keep up with news and sport. Will thi4
The pictures from my digital box are all green!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
Wednesday, 11 May 2011
Briantist
sentiment_very_satisfiedOwner

7:08 PM

Daniel Esmond: Sorry, but your TV is not a Freeview HD - DVB-T2 one. You will need to use a Freeview HD box with the set to watch the channels.

link to this comment
Briantist's 38,915 posts GB flag
Briantist
sentiment_very_satisfiedOwner

7:19 PM

Colin Hersey: Yes, " After the PSB multiplexes switch at The Wrekin, the Arqiva multiplexes will remain on their pre-switchover frequencies and powers, and SDN will use a temporary frequency, for a short period before all three multiplexes adopt their final frequencies and powers during September 2011. During this transition period the commercial multiplexes will use the following frequencies: SDN ch49 and ch31 (both 2kW), Arqiva A ch57 (not 53) (1kW), Arqiva B ch53 (not 57) (1kW)."

link to this comment
Briantist's 38,915 posts GB flag
Friday, 27 May 2011
D
David
sentiment_satisfiedBronze

4:11 PM

Mike Dimmock - thank you for the explaination 64QAM versus 16QAM eh?

Actually, I miss-spoke. Mux A is the only one I cannot receive well at the moment, but it is highly dependant upon the weather and time-of-year.

link to this comment
David's 25 posts GB flag
Monday, 30 May 2011
M
marilyn
5:17 PM

I live in Hanslope mk19 and since the digital switchover have lost itv4 and yesterday any idea why and what can I do to get them back

link to this comment
marilyn's 1 post GB flag
Briantist
sentiment_very_satisfiedOwner

7:35 PM

marilyn: Bit hard to say without a full postcode, but you are probably using the Sandy Heath transmitter and if so you will have to wait until the ArqB multiplex goes to full power on 14th September 2011.

link to this comment
Briantist's 38,915 posts GB flag
Wednesday, 1 June 2011
D
Don Johnstone
10:38 PM

BBC 1 and 2 now disappeared since the first part of the Craigkelly switchover.Internal aerials but two different ones that worked fine before this 'improvement'.

link to this comment
Don Johnstone's 2 posts GB flag
K
KMJ,Derby
sentiment_satisfiedGold

11:25 PM

Don Johnstone: Did you do a factory reset to remove all memory of the Mux1 versions of BBC1 and BBC2 from the channel list? Check if they are currently in the 800s. If you still don't find Mux BBCA when rescanning after doing a factory reset check that your receiver or STB is not on the list of equipment that does not support the 8k mode. If it is on the list, a new Freeview box is required to continue viewing Freeview after switchover. Note some receivers do not like finding a mix of 2k and 8k mode muxes..Do a manual tune for Mux BBCA on C27 if this is the problem.

link to this comment
KMJ,Derby's 1,811 posts GB flag
Saturday, 4 June 2011
I
Ian
11:40 PM
Kilmarnock

I have 2 sony DVD recorders with HDD and freeview built in, which are in different rooms and both have signal strengths of about 96% and quality is 100%. When I scan for all channels they all appear and are in the EPG, however when I switch the machines off, or they switch off automatically at the end of recordings, once switched back on, about 95% of the EPG is blank ?? I have had these both for over a year, with no problems to date and am serviced from the Darvel transmitter ? As the strengths and qualities are both high I am baffled as to the problem ??

link to this comment
Ian's 1 post GB flag
Ian's: mapI's Freeview map terrainI's terrain plot wavesI's frequency data I's Freeview Detailed Coverage
Sunday, 5 June 2011
Briantist
sentiment_very_satisfiedOwner

4:33 PM

Ian: It is quite likely your signal are too strong now. If you have any boosters or amplifiers, remove them from your system.

link to this comment
Briantist's 38,915 posts GB flag
Sunday, 26 June 2011
R
Rick
12:51 PM
Hitchin

Postcode SG4 7HP. Up until a few weeks ago I could receive all Freeview channels with no problems. Now all the BBCA channels vary from strong to no signal making them unwatchable. Every other MUX works fine. Luckily I can get all BBC channels on Freesat so question is largely academic (though there are times when this is not so good). I have a SONY with built in Freesat and Freeview and a high gain wide band loft mounted aerial pointed at Sandy Heath. All other houses round here have their aerials on long poles but I cannot do this as I live in a listed building. Any solution or do I live with it? Also would an aerial booster help?
Thanks

link to this comment
Rick's 1 post GB flag
Rick's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
Select more comments

Your comment please
Please post a question, answer or commentUK Free TV is here to help people. If you are rude or disrespectful all of your posts will be deleted and you will be banned.







Privacy policy: UK Free Privacy policy.