[linux-dvb] Terratec Cinergy 1200 DVB-C and QAM 128

timo.helkio at nic.fi timo.helkio at nic.fi
Thu Jun 16 12:32:57 CEST 2005


> According to Anssi Hannula <anssi.hannula at gmail.com>:
> > Heikki Kantola wrote:
> > > I bought Terratec Cinergy 1200 DVB-C PCI card a while ago. With Debian
> > > packaged kernel version 2.6.11 the card is recognized fine, but looks
> > > like at the moment the drivers don't work too well with channels using
> > > QAM 128. And as the HTV network here in Helsinki all but one multiplex
> > > use that QAM, I can mostly see just distorted images. There is no
> > > problems in watching the three channels in the multiplex using QAM 64.
> > > Too bad those are quite uninteresting - especially the local semi-static
> > > info channel.
> > 
> > There was a fix introduced in CVS on March 8, maybe you could try to 
> > upgrade to CVS version?
> 
> I managed to update into 2.6.11 kernel with CVS DVB modules, but I
> still cannot see sensible picture from the problematic channels. 
>  
> -- 

I managed to get this card working with QAM 128 channels by changing 
174500000 to 150000000 in budget-av.c (code extract below). Free 
channels are here in Uusikaupunki using freq. 154 and 170 MHz and all 
QAM 128. Maybe this has been solved earlier, but there has not been any 
postings about it.

#define TUNER_MUL 62500

	u32 div = (params->frequency   36125000   TUNER_MUL / 2) / TUNER_MUL;

	buf[0] = (div >> 8) & 0x7f;
	buf[1] = div & 0xff;
	buf[2] = 0x8e;
	buf[3] = (params->frequency < 174500000 ? 0xa1 :
		  params->frequency < 454000000 ? 0x92 : 0x34);

	if (i2c_transfer(&budget->i2c_adap, &msg, 1) != 1)
		return -EIO;
	return 0;
}

            Timo Helkiö





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