[linux-dvb] Re: Tuning problems with TT DVB-C 1500 (saa7146 +stv0297) and QAM128

Patrick Boettcher patrick.boettcher at desy.de
Sun Aug 21 20:29:57 CEST 2005


On Sun, 21 Aug 2005, Toni Lindroos wrote:

> Hi,
>
> what kind of signal and s/n ratio values should I get with czap/femon? README 
> says that over 0x8000 is OK for both but my values are considerably lower. 
> Here's an example:

> status 1f | signal 031c | snr 0faa | ber 00000000 | unc 00000000 |

Toni, don't case about the signal and snr values as longas ber and unc is 
0. Most of the signal and snr calculation stuff need 
floating-point-operations which can't be done in a kernel module, this the 
signal and snr values depend on the modulation-driver and are most of the 
time "incorrect".

Besides the long time it takes for to get a lock the reception looks 
good to me. Do you still have problems when watching video?

regards,
Patrick.

--
   Mail: patrick.boettcher at desy.de
   WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/




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