[linux-dvb] Re: Newstruct and DVB-C with QAM_256

[Martin Neuditschko <yosuke.tomoe@gmx.net>]

On Wed, Jul 03, 2002 at 11:52:03AM +0200, Holger Waechtler wrote:
> Martin Neuditschko wrote:
> >Sometimes it is not able to switch to a channel:
> >melchior:/usr/local/src/newstruct_020702/apps/szap # ./czap SRTL
> >status 00 | signal 9595 | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8989 | snr d2d2 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8c8c | snr d7d7 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8a8a | snr d9d9 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8282 | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7b7b | snr d3d3 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7b7b | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8484 | snr d6d6 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8383 | snr d3d3 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8989 | snr c4c4 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8d8d | snr cfcf | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8484 | snr d6d6 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8282 | snr d9d9 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8c8c | snr d8d8 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7c7c | snr d3d3 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8888 | snr d5d5 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7a7a | snr d2d2 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8383 | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7c7c | snr d1d1 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8585 | snr d7d7 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8a8a | snr d8d8 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8383 | snr d9d9 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8282 | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 07 | signal 8a8a | snr d4d4 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 7c7c | snr d5d5 | ber 0000a2e8 | unc 0000007f |
> >status 00 | signal 8686 | snr d2d2 | ber 0000a2e8 | unc 0000007f |
> >
> >Some suggestions to try something?
> 
> The 4th bit (FE_HAS_SYNC) is missing, this means that the frontend could 
> not find the MPEG sync byte. This means that either your frontend 
> parameters are not set correctly, the signal is ways too bad so that 
> errors can't be corrected or that it is no DVB/MPEG transmission.

But SRTL (Super RTL) is working in Windows with the Hauppauge Tool.
I have checked channels.conf again, but the values of my channels.conf
are the same as the values from the Hauppauge Card.
The channels list from Hauppauge has no "FEC" and no "QAM" as I see
and the frequency is a bit different. It is always 12kHz higher.
(For example for channel SuperRTL it is 570012 in the Hauppauge list
and 570000000 in my own list. Could this be a reason?)

Why is the difference between the frequences always a multiple of 4MHz?
Isn' t it possible that for expample between 570000000Hz and 574000000Hz
is a frequence where also data is transmitted?
Or isn't it possible that an other Cable-Provider uses the frequences
like this: 571000000Hz, 575000000Hz,... ?

> If somebody out there has the time to write a simple command line 
> channel scan application to create channel lists please let me know, I'd 
> like to include this in the DVB package, but here nobody has currently 
> the time to do this.

I have time and I will try to do it, but I don't know if I have the
knowledge to do it.

best regards
Martin Neuditschko


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