🚀 go-pugleaf

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