[linux-dvb] Re: Technotrend Premium DVB-C 2300 OT cannot tune to QAM128

Teppo Jalava tjalava at welho.com
Thu Feb 24 11:54:24 CET 2005

Johannes Stezenbach wrote:
> Teppo Jalava wrote:
>>Saku Vainikainen wrote:
>>>I have a Technotrend Premium DVB-C 2300 OT (analog + digital) card (see 
>>>dmesg etc. outputs in the end of this mail) and I (99.9% of the time) 
>>>cannot tune into QAM128 muxes. QAM64 works quite OK - the image and sound 
>>>are a bit distorted. I have managed to tune into QAM128 two times.
>>I have the same problem with the same card, also in fi-HTV network. I
>>did a little debugging on the stv0297.c and it seems that the driver
>>goes to "goto timeout" on line 657. If I increase the sleep time on line
>>650, I get the driver to tune and lock to a channel, but the picture is
>>very distorted. czap output looks like this:
>>status 1f | signal 0072 | snr 24df | ber 00000000 | unc 00000000 |
>>status 1f | signal 0073 | snr 2343 | ber 00000000 | unc 00000000 |
>>so the signal status and snr are pretty bad, right? Same machine with
>>windows and Technotrend application everything works perfectly.
> So that suggests that our stv0297 driver sucks. The problem
> is that most active developers don't have QAM128 signals for
> testing (and I don't have a stv0297 card anyway).
> Is there anyone who has both a stv0297 card and access to QAM128
> signals who is willing to dive into it? I can only offer some
> limited support, however. Maybe we could contact the original
> stv0297 author for help.

Hi, has anyone had time to look deeper into this problem? I've been 
trying to do some debugging and testing different values here and there, 
but it's been kinda pointless, since I really don't know what to do.. 
Anyway, the card is practically useless at the moment in Helsinki, I can 
only see some stupid sports channel that uses QAM64. So any suggestions, 

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