[linux-dvb] stv0297: QAM256 improvement for TT-C2300 revisited

Alexander Koenig alex at lisas.de
Thu Jul 31 22:47:08 CEST 2008


Hi,

last October Hartmut Birr submitted a patch that greatly improves
reception of QAM256 modulated channels on the TT-C2300.
(http://www.linuxtv.org/pipermail/linux-dvb/2007-October/021422.html) 

The patch was not applied as there were a few reports that it was
causing problems. However, the end of the thread suggests that some of
these issues were a result of using the patch in combination with
other frequency shifting patches that also tried to address QAM256
issues.

Other issues were reported on different hardware (CableStar), so I
extended the patch to change the demodulation frequency only for
Nexus-CA. 

The patch was tested successfully on two TT-C2300 based systems, it
would be great if someone could test whether the patch does hurt
QAM256 reception with CableStar devices or not.

Alexander König
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