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

Heikki Kantola hezu at iki.fi
Tue Jun 21 20:20:43 CEST 2005


Johannes Stezenbach <js at linuxtv.org> wrote:
> timo.helkio at nic.fi wrote:
> > 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);
> 
> How does this perform in comparison?
> 
>  	buf[2] = 0x86;
>  	buf[3] = (params->frequency < 150000000 ? 0x01:
>  		  params->frequency < 445000000 ? 0x02 : 0x04);

I have now tried both of the above (kernel 2.6.11 with the latest 
Debian patches), but with no luck: any QAM128 channel looks mostly
distorted (and audio has breaks). I am starting to wonder if I'm doing
something wrong...

-- 
  *  H e i k k i   K a n t o l a  *  | Ihmiselämä ei ole ollenkaan
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