Thread View: comp.os.linux.misc
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Started by The Natural Philosopher
Wed, 20 Jul 2011 14:03
Linux DVB and digital switchover in the UK
Author: The Natural Philosopher
Date: Wed, 20 Jul 2011 14:03
Date: Wed, 20 Jul 2011 14:03
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For those of you who run TV cards on Linux in the UK..and are having trouble retuning using 'scan' because the transmitter files that come with the standard distros of dvb utilities don't work any more, here is the way to sort out how to patch them First of all you need to find the transmitter definition files. Mine were in /usr/share/dvb/dvb-t Copy the one you use into somewhere else - home directory Go to this website http://www.digitaluk.co.uk/postcodechecker/main/trade/KT23+4AG/NA/0/NA The important thing is to declare yourself trade, and the postcode is obvious from the above URL (this one is in Surrey) That nets you your local transmitter data. To convert channel number to frequency, as the transmitter files require, take the channel number and add 38.25 to it, and multiply by 8. That's the frequency in MHz. If there is a plus after the channel number add 0.167 MHZ. E.g. channel 50+ is 88.25 * 8= 706MHz plus 0.167MHZ = 706167000 HZ. That's the second parameter of the new entry. The third is always 8Mhz, the channel bandwidth. The fourth sixth and seventh are modulation types. If you hover the mouse cursor over the channel number on that page, they are revealed . I.e 64QAM 2/3 8k DVB-T These go in the fields in the new entry in the transmitter file so e.g. T 706167000 8MHz 2/3 NONE QAM64 8k 1/32 NONE is a valid entry I have no idea what the 5th, 8th and 9th parameters are I left those as NONE, 1/32, and NONE My modified uk-sudbury file is this # UK, Sudbury # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy # 49+ MUX A SDN T 698167000 8MHz 2/3 NONE QAM64 2k 1/32 NONE #41 MUX2 d3 &4 T 634000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE #44 MUX-1 BBCA T 658000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE #47 (HD) T 682000000 8MHz 2/3 NONE QAM256 32k 1/32 NONE #54 Arqiva A T 738000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE #50+ Arqiva B T 706167000 8MHz 2/3 NONE QAM64 8k 1/32 NONE Hope this helps anyone else struggling to retune - several times - in the mass switchover being undertaken this year. Note. Scan didn't understand the HD MUX. Which is OK because neither does my Hauppage dongle :-) Note this is all Linux specific. Most other TV software has better self scanning than Linux :-)
Re: Linux DVB and digital switchover in the UK
Author: The Natural Philosopher
Date: Wed, 20 Jul 2011 16:35
Date: Wed, 20 Jul 2011 16:35
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Pete Shew wrote: > On 20/07/2011 15:03, The Natural Philosopher wrote: >> For those of you who run TV cards on Linux in the UK..and are having >> trouble retuning using 'scan' because the transmitter files that come >> with the standard distros of dvb utilities don't work any more, here is >> the way to sort out how to patch them >> >> First of all you need to find the transmitter definition files. >> >> Mine were in /usr/share/dvb/dvb-t >> >> Copy the one you use into somewhere else - home directory >> Go to this website >> >> http://www.digitaluk.co.uk/postcodechecker/main/trade/KT23+4AG/NA/0/NA >> >> The important thing is to declare yourself trade, and the postcode is >> obvious from the above URL (this one is in Surrey) >> >> That nets you your local transmitter data. >> >> To convert channel number to frequency, as the transmitter files >> require, take the channel number and add 38.25 to it, and multiply by 8. >> That's the frequency in MHz. >> >> If there is a plus after the channel number add 0.167 MHZ. >> >> >> E.g. channel 50+ is 88.25 * 8= 706MHz plus 0.167MHZ = 706167000 HZ. >> >> That's the second parameter of the new entry. >> >> The third is always 8Mhz, the channel bandwidth. >> >> The fourth sixth and seventh are modulation types. If you hover the >> mouse cursor over the channel number on that page, they are revealed . >> I.e >> >> 64QAM 2/3 8k DVB-T >> >> These go in the fields in the new entry in the transmitter file so e.g. >> >> T 706167000 8MHz 2/3 NONE QAM64 8k 1/32 NONE >> >> is a valid entry >> >> I have no idea what the 5th, 8th and 9th parameters are I left those as >> NONE, 1/32, and NONE >> >> My modified uk-sudbury file is this >> >> # UK, Sudbury >> # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy >> # 49+ MUX A SDN >> T 698167000 8MHz 2/3 NONE QAM64 2k 1/32 NONE >> #41 MUX2 d3 &4 >> T 634000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE >> #44 MUX-1 BBCA >> T 658000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE >> #47 (HD) >> T 682000000 8MHz 2/3 NONE QAM256 32k 1/32 NONE >> #54 Arqiva A >> T 738000000 8MHz 2/3 NONE QAM64 8k 1/32 NONE >> #50+ Arqiva B >> T 706167000 8MHz 2/3 NONE QAM64 8k 1/32 NONE >> >> >> Hope this helps anyone else struggling to retune - several times - in >> the mass switchover being undertaken this year. >> >> Note. Scan didn't understand the HD MUX. Which is OK because neither >> does my Hauppage dongle :-) >> >> Note this is all Linux specific. Most other TV software has better self >> scanning than Linux :-) > Thanks, I will know if I need it on August 3rd. > > Can you tell me what the other events after steps 1 and 2 mean, i.e. > "COM late power up" and "Reception change"? > COM late power up I take to mean 'we got the channels in place, now we will put in a bigger transmitter' 'Reception change' could mean anything. Relocating a transmitter array. on the pole? Ask Tony Sayer. My guiding motto when in business was 'only learn as much as you need to, to get the task in hand done' :-) > Pete
Re: Linux DVB and digital switchover in the UK
Author: The Natural Philosopher
Date: Wed, 20 Jul 2011 17:59
Date: Wed, 20 Jul 2011 17:59
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Pete Shew wrote: > On 20/07/2011 15:03, The Natural Philosopher wrote: >> If there is a plus after the channel number add 0.167 MHZ. > > Do we subtract 0.167 if there is a minus after the channel number? > > Pete I believe so, yes. Its not like I wrote the code or am an RF TV frequency expert. I just fiddled with it till it worked with a but of educated guesswork!
Re: Linux DVB and digital switchover in the UK
Author: Mark Williams
Date: Mon, 01 Aug 2011 18:47
Date: Mon, 01 Aug 2011 18:47
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The Natural Philosopher <tnp@invalid.invalid> writes: > For those of you who run TV cards on Linux in the UK..and are having > trouble retuning using 'scan' because the transmitter files that come > with the standard distros of dvb utilities don't work any more, here > is the way to sort out how to patch them > > [...] > > Hope this helps anyone else struggling to retune - several times - in > the mass switchover being undertaken this year. Or use `w_scan' (<URL:http://wirbel.htpc-forum.de/w_scan/index2.html>), thus avoiding the need for the initial tuning files? -- Mark
Re: Linux DVB and digital switchover in the UK
Author: The Natural Philosopher
Date: Mon, 01 Aug 2011 19:37
Date: Mon, 01 Aug 2011 19:37
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Mark Williams wrote: > The Natural Philosopher <tnp@invalid.invalid> writes: > >> For those of you who run TV cards on Linux in the UK..and are having >> trouble retuning using 'scan' because the transmitter files that come >> with the standard distros of dvb utilities don't work any more, here >> is the way to sort out how to patch them >> >> [...] >> >> Hope this helps anyone else struggling to retune - several times - in >> the mass switchover being undertaken this year. > > Or use `w_scan' (<URL:http://wirbel.htpc-forum.de/w_scan/index2.html>), > thus avoiding the need for the initial tuning files? > If I read German, I might...
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