[linux-dvb] Re: Video Disk Recorder version 0.90

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Dave Chapman wrote:
> 
> On Monday 06 August 2001 10:41 pm, you wrote:
> > Hi!
> >
> > > If anything has been changed here at all I guess it must have been in the
> > > driver, because I didn't change anything in VDR in that area.
> >
> > Strange. Since I tried 0.84 and 0.85 with the same drivers. 0.84 was fast,
> > 0.85 not.
> >
> > Thorsten
> 
> It may just be down to environmental changes.  A few weeks ago, when the
> temperature was very warm in London, I had to tune a few MHz lower than usual
> to get a lock on some channels.  The weather's now cooler, and I have gone
> back to my older settings.
> 
> In my experience, channels with higher symbol rates (e.g. 27500) can lock
> over a range of about 5 or 6 MHz.  This range goes down as the symbol rate
> goes down.  For example, I find that channels with a 5632 symbol rate will
> only lock on a specific frequency.
> 
> Dave.

I guess that's because mon_zigzag() in DVB/driver/dvb.c calculates the offset as

  soff=dvb->front.srate/16;

So if you have a larger symbol rate, the function scans a wider area.

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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