[linux-dvb] Re: Tuning problems

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Wednesday 11 February 2004 18:53, Torbjörn Jansson wrote:
> > > I have been trying to figure out why the windows software gets
> > > better signal quality than the linux drivers on some channels.
> >
> > FWIW, I compared the tuner control code of the TT driver
> > (2.16a) against
> > the Linux sources and they appear to work exactly the same. So the
> > difference is probably _not_ found in the tuner control.
> >
> > Instead, take a look at the VES1820 control code for QAM and
> > symbol rate.
> > What QAM and symbol rate are the channels you are having
> > problems with?
> > Here in Germany, I only have 64-QAM and 6900 kbaud channels,
> > and those work
> > flawlessly.
>
> All channels is QAM64 and 6875 K symbol rate.
>
> I have looked in the windows drivers and I managed to find the ves1820
> initial values (which was almost identical to the linux values) and some
> other tuning related code that looked similar to how the linux drivers to
> it.
> But I haven't looked at the qam and symbol rate parts yet.
> I'm no assembly expert so it takes some time to examine the drivers.

Hi, I've noticed this too, but with the STV0299. I can lock to all signals 
around a symbol rate of 27500000 , but not to any which have a much lower 
one. I've got a feeling I'm going to have to look at the TT driver to get the 
exact settings as well for that.



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