[linux-dvb] STV0297 Tuning Issues

Michael Ditum mike at mikeditum.co.uk
Thu Mar 29 10:31:33 CEST 2007


Hi,

I'm currently doing some tuning testing with the STV0297 DVB-C Card. I have
a DVB-S to DVB-C TransModulator which I am using and just modifying the
output settings.

I'm having some issues tuning in a couple of the test cases and was
wondering if there was any technical reason why this was not possible. The
tests I am having trouble tuning in are...

   1. Symbol Rate of 1.74MBd with QAM 32, 64 & 128 (works fine with QAM
   16 and 256)
   2. Symbol Rate of 3.48MBd with QAM 32 (works fine with all other
   QAM's)

I am testing the tuning with dvbtune and as long as the xml version of the
SDT is returned I am counting that as working.

Does anyone know why I cannot tune with these settings? Is it a problem with
the driver?

I've provided my test results below;

Thanks for any help

Mike

 *Frequency (MHz)
* *Bitrate (MB/s)
* *Symbol Rate (MBd)
* *Modulation (QAM)
* *Tuning Tested* *Tuning Works* *Notes*  62 25.4 6.89 16 *Yes* *Yes*
 220 25.4 6.89 16 *Yes* *Yes*
 440 25.4 6.89 16 *Yes* *Yes*
 62 25.21 6.84 16 *Yes* *Yes*
 220 25.21 6.84 16 *Yes* *Yes*
 440 25.21 6.84 16 *Yes* *Yes*
 62 12.83 3.48 16 *Yes* *Yes*
 220 12.83 3.48 16 *Yes* *Yes*
 440 12.83 3.48 16 *Yes* *Yes*
 62 6.41 1.74 16 *Yes* *Yes*
 220 6.41 1.74 16 *Yes* *Yes*
 440 6.41 1.74 16 *Yes* *Yes*
 62 31.75 6.89 32 *Yes* *Yes*
 220 31.75 6.89 32 *Yes* *Yes*
 440 31.75 6.89 32 *Yes* *Yes*
 62 31.52 6.84 32 *Yes* *Yes*
 220 31.52 6.84 32 *Yes* *Yes*
 440 31.52 6.84 32 *Yes* *Yes*
 62 16.04 3.48 32 *Yes* *No* Couldn't Lock  220 16.04 3.48 32 *Yes*
*No* Couldn't
Lock  440 16.04 3.48 32 *Yes* *No* Couldn't Lock  62 8.02 1.74 32
*Yes* *No* Couldn't
Lock  220 8.02 1.74 32 *Yes* *No* Couldn't Lock  440 8.02 1.74 32
*Yes* *No* Couldn't
Lock  62 38.1 6.89 64 *Yes* *Yes*
 220 38.1 6.89 64 *Yes* *Yes*
 440 38.1 6.89 64 *Yes* *Yes*
 62 37.82 6.84 64 *Yes* *Yes*
 220 37.82 6.84 64 *Yes* *Yes*
 440 37.82 6.84 64 *Yes* *Yes*
 62 19.24 3.48 64 *Yes* *Yes*
 220 19.24 3.48 64 *Yes* *Yes*
 440 19.24 3.48 64 *Yes* *Yes*
 62 9.62 1.74 64 *Yes* *No* Couldn't Lock  220 9.62 1.74 64 *Yes* *No* Couldn't
Lock  440 9.62 1.74 64 *Yes* *No* Couldn't Lock  62 44.45 6.89 128 *Yes* *
Yes*
 220 44.45 6.89 128 *Yes* *Yes*
 440 44.45 6.89 128 *Yes* *Yes*
 62 44.12 6.84 128 *Yes* *Yes*
 220 44.12 6.84 128 *Yes* *Yes*
 440 44.12 6.84 128 *Yes* *Yes*
 62 22.45 3.48 128 *Yes* *Yes*
 220 22.45 3.48 128 *Yes* *Yes*
 440 22.45 3.48 128 *Yes* *Yes*
 62 11.22 1.74 128 *Yes* *No* Couldn't Lock  220 11.22 1.74 128 *Yes*
*No* Couldn't
Lock  440 11.22 1.74 128 *Yes* *No* Couldn't Lock  62 50.8 6.89 256 *Yes* *
Yes*
 220 50.8 6.89 256 *Yes* *Yes*
 440 50.8 6.89 256 *Yes* *Yes*
 62 50.43 6.84 256 *Yes* *Yes*
 220 50.43 6.84 256 *Yes* *Yes*
 440 50.43 6.84 256 *Yes* *Yes*
 62 25.66 3.48 256 *Yes* *Yes*
 220 25.66 3.48 256 *Yes* *Yes*
 440 25.66 3.48 256 *Yes* *Yes*
 62 12.83 1.74 256 *Yes* *Yes*
 220 12.83 1.74 256 *Yes* *Yes*
 440 12.83 1.74 256 *Yes* *Yes*
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