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List:       linux-video
Subject:    Re: DVB-T : +166 kHz Magic or Official in France ?
From:       Andrew de Quincey <adq_dvb () lidskialf ! net>
Date:       2006-06-28 18:09:42
Message-ID: 200606281909.43084.adq_dvb () lidskialf ! net
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On Friday 23 June 2006 23:14, Hartmut Hackmann wrote:
> Hi,
>
> gilles Royer wrote:
> > Hello,
> >
> > thanks to the hints of Harmut Hackmann and
> > the  discussions with Bernard Baudet,  Franck Desbois
> > and others, my Asustek My-Cinema P-7131 works well in DVB-T.
> > Below is my file fr-Paris-Chennevieres for
> > tuning at Paris-East.
> >
> > I shifted as others the round frequency by 166000 Hz.
> > But I observe that tuning, for example for "France 2"
> > with xine, occurs if the shift is in [32,218] and the middle
> > is 125 rather than 166 (lack of symetry?). It is also said that the shift
> > may be a multiple d*166, d=-1,0,2,3.
> > Is there "official" informations for that ?
>
> In dvb-t mode, classic tuner "cans" have a tuning step size of 4Mhz / 24
> giving 166.7 kHz. The tuner chip on your board (TDA8275A) supports only
> 62.5 kHz steps. This causes the "displacement".
> In some countries, this offset has been introduced to give a better
> separation from adjacent analog channels. AFIK this isn't documented
> anywere, i had to learn this the hard way too.
>
> > The fr-Paris-Tour_Eiffel given in dvb-tools should also be
> > corrected to avoid  much despair
> >
> > # Paris_East - France (DVB-T transmitter of Chennevières)
> > # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
> > T 738166000 8MHz 2/3 NONE QAM64 8k 1/32 NONE
> > T 714166000 8MHz 2/3 NONE QAM64 8k 1/32 NONE
> > T 762166000 8MHz 2/3 NONE QAM64 8k 1/32 NONE
> > T 786166000 8MHz 2/3 NONE QAM64 8k 1/32 NONE
> > T 810166000 8MHz 2/3 NONE QAM64 8k 1/32 NONE
> > T 586166000 8MHz 3/4 NONE QAM64 8k 1/8 NONE
>
> I think so too. Andrew, as far as i know, you maintain this part of the
> repository. Can you add it please?

I would - but I think all the fr-* files are screwed.. they're not named after 
transmitters.. I found a few people on the list trying to use one file for 
the same area, but it was not working because they were actually pointing at 
different transmitters. 

I don't have the time to sort this out - if someone else wants to fix it, I'll 
happily commit it for them.

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