[linux-dvb] new DVB-T initial tuning for fr-nantes

Christophe Thommeret hftom at free.fr
Tue May 18 16:47:47 CEST 2010


Le mardi 18 mai 2010 16:39:56, Christophe Thommeret a écrit :
> Le mardi 18 mai 2010 16:25:56, BOUWSMA Barry a écrit :
> > On wto (wtorek) 18.maj (maj) 2010, 15:05:00, matpic wrote:
> > 
> > Salut!
> > 
> > > hello
> > > As from today (18/05/2010) there is new frequency since analogic signal
> > > is stopped and is now only numeric.
> > > guard-interval has to be set to AUTO or scan find anything
> > > 
> > >  (1/32, 1/16, 1/8 ,1/4 doesn't work)
> > 
> > I do not have the CSA data at hand, but I understand that
> > presently use is made of single transmitter sites, in a MFN
> > (Multi-Frequency Network) and thus a guard interval of 1/32 should
> > be correct.
> > 
> > (I understand though that some filler transmitters may be in
> > planning so that a small SFN may be put in service, but I am
> > not clear as to these details...  I must research this.)
> > 
> > > #same frequency + offset 167000000 for some hardware DVB-T tuner
> > 
> > It was my understanding that the different offsets above or
> > below the nominal centre frequency is a result of mixed digital
> > and legacy analogue services co-broadcasting, in order to avoid
> > interference with adjacent channels.
> > 
> > So I am wondering whether, in the absence of local analogue
> > services, this offset is no longer employed?
> > 
> > I am afraid that I am not following the conversion to TNT so
> > closely to know if a whole geographic region, in this case the
> > Loire, is having the remaining analogue services shut down all
> > at once, or if it is being done on a site-by-site basis, with
> > the potential for interference to a more remote but still
> > operational analogue transmitter.
> > 
> > In any case, all but one of the new frequencies appear to be
> > very different from the ones previously used before today.
> > 
> > 
> > Merci, for reporting this change!
> > 
> > barry bouwsma
> 
> All analogic services are all closed at once.
> I guess the "offset" is there to help some (buggy?) devices, like cinergy
> T2, not to reflect a real frequency offset.

BTW, analogic shut down has happened (18 may, 00:00) for the entire french 
region "Pays de Loire", so a lot of transmitters are affected.
"fr-Laval" now uses these freqs:

714000000
570000000
770000000
762000000
650000000
786000000

-- 
Christophe Thommeret





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