[linux-dvb] Re: [vdr] Re: Siemens dvb-c and HTV

["Augusto Cardoso" <augusto@carhil.net>]

Hi!

(Disclaimer: I don't know you card and I'm not familiar with the driver for it)

QAM128 is a not a symmetrical modulation. This makes it a difficult mode to operate. The hardware has to have a very "clean" signal path and the software has to be tailor to this type of applications. Sometimes it's easier to do QAM256 than QAM128. I'm surprise that people are actually using QAM128.

Can you get any performance information from the card. For example the uncorrected packets, BER, SNR, etc. This could provide some information on how bad the situation is and if there is hope of getting this working.
I remember working with the ST cable part and spending a lot of time messing around with some undocumented registers to get it working at QAM256. We never got the QAM128 fully functional and I remember that at B2C2 we took it out of the specification.

Sorry I couldn't help you much on this.

	Augusto

*********** REPLY SEPARATOR  ***********

On 12/9/2003 at 9:59 AM Jonas Munsin wrote:

>linux-dvb@linuxtv.org may be the correct mailinglist for this...
>
>On Mon, Dec 08, 2003 at 09:17:21PM +0200, Marko Myllymaa wrote:
>> Is the signal i nmy wall outlet that poor that Siemens dvb-c can't have
>> good reception on QAM128 channels? QAM64 channels are fine, even with the
>> longer cable.
>
>I think I read somehwere that Fujitsu/Siemens cards have poor QAM128
>reception. I also see more mosaic/skipping disturbances than I'd like to
>here in Turku with QAM128, in the order of 1-2 /hour.
>
>Btw, I have the same problem this thread originally described; the DVB
>driver (CVS) works pretty good; the dvb-kernel driver (CVS, from a few
>days ago) is unusable.
>
>
>
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