[linux-dvb] Re: QAM_64 and QAM_128 blues

[Holger Waechtler <holger@convergence.de>]

Hi,

can you tune to all channels using czap? It looks to me that not all 
parameters are set correctly by the FE_SET_FRONTEND ioctl in the 
application.

Holger


JosceJ@netscape.net wrote:
> My card: Hauppage DVB-C
> DVB driver: dvb-20021025.tar.bz
> VDR: 1.1.13
> 
> I have a problem with DVB driver that I can't
> figure out. If I set:
> 
> static struct dvb_frontend_parameters default_param [] =
> ...
> {    {                       /* Cable */
>         frequency: 282750000,
>         inversion: INVERSION_OFF,
>         { qam:  { symbol_rate: 5900000,
>               fec_inner: FEC_AUTO,
>               modulation: QAM_128
>             }
>         }
>     },
> ...
> 
> I have no problem using all channels that
> have QAM_128 and symbol_rate: 5900000, but
> I can't tune into QAM_64 symbol_rate: 6900000
> 
> If I set default_param [] for cable to
> QAM_64 and symbol_rate: 6900000 I can tune
> into all QAM_64 channels but not to QAM_128.
> 
> What happens is that when I start with a QAM_128 channel
> and get a lock all is well. If I then try to switch to
> a QAM_64 channel the zigzag starts and never
> stops and when I try to change channels in VDR
> back to a QAM_128 the DVB driver doesn't seem to respond,
> it just keeps zigzagging on the old QAM_128 channel.
> 
> This would be a typical scenario:
> 
> Start up DVB with QAM_128, sRate 5900000 -> OK
> Start VDR with Channel 1 QAM_128, sRate 5900000 -> OK
> Switch VDR Channel 2 QAM_128, sRate 5900000 -> OK
> Switch VDR Channel 3 QAM_64, sRate 6900000 -> ZIGZAG never stops
> Switch VDR Channel 1 QAM_128, sRate 5900000 -> NO REPLY
> 
> Any ideas?
> 
> Josce
> 
> 
> 
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