[linux-dvb] DVICO Dual Digital 2 - Chris Pascoe's Test branch

Trent Piepho xyzzy at speakeasy.org
Thu Apr 12 16:26:00 CEST 2007

On Thu, 12 Apr 2007, Luke Rosenthal wrote:
> >> now tunes but at the expense of another station.  As well, another
> >> channel I previously needed an offset to tune actually tunes now.
> >> Peculiar, but
> >> given that you are talking about fixes for rounding, it makes sense.
> >
> > I have a patch in that would bein the curent master for dvb-pll rounding.
> > There was a small change to the thomson dtt7579 tuner data, which is
> > what I think your device uses.
> >
> > I don't think this change would make any difference.  What frequency
> > exactly is it that works now but didn't before?  I can see if dvb-pll is
> > programming a different value than it did before.
> SBS is the frequency which never used to work, but does now - 536625000.

I didn't think my patch would have any effect for this tuner, but in this
case it did.  I'm glad it it was an improvement.

The tuner can only tune in steps of 1/6 MHz, so it can't get the exact
correct frequency.

For SBS @ 536625000 Hz, before 536500000 Hz after 536666667 Hz
For Nine @ 191625000 Hz, before 191500000 Hz after 191666667 Hz
For Ten @ 219500000 Hz, before 219500000 Hz after same frequency

For the two channels that now work better, the tuner used to be tuning to a
frequency 125 kHz too low, after my patch it's tuning to a frequency
41 1/6th kHz too high.

The one channel that doesn't work should be tuning the same frequency as it
did before the patch.  I wonder if that frequency or something else is
wrong?  I don't suppose the information on http://www.dba.org.au/ is any
different that what you've been trying?

> Actually, adapter1 seems to get better signal readings across all
> channels.  Eg on 7 digital (never had a problem with it) adapter0 sees
> signal 57fc, adapter1 sees signal 66dc.  Is this normal?

I've seen other reports from people with multiple cards that one card gets
better reception than the other.

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