[linux-dvb] nova-t 500 reception differencies between the two tuners

Henrik Beckman henrik.list at gmail.com
Wed Apr 11 10:13:47 CEST 2007


Seems ok to me now, everuthing seem better with the patch.
I get ~55-60% signal strenght on both tuners for all channels, my LNA seems
to always be 1, but I suspetct that it doesn´t work.

/Henrik


On 4/8/07, Henrik Beckman <henrik.list at gmail.com> wrote:
>
> Hi,
>
> Reception on primary tuner seems to be worse, more glitches in decoding
> (haven´t run tzap), could be foilage or lack of LNA though.
> I´m not realy dependent upon LNA since my reception is ok, but I´ll verify
> if LNA is working without manual module load.
>
> On the other hand the secondary tuner is now usable for all channels.
>
> Anything I can do to help improving this patch further ?
>
> /Henrik
>
>
> On 4/7/07, Simon Lundell <simon.lundell at his.se> wrote:
> >
> > Hi,
> >
> > It did not solve the problem here. I upgraded to the latest hg version,
> > applied the patch, make:d and make install:ed. The signal strength
> > dropped from around a700 to 8000 in tzap. The second tuner is even
> > worse. The thing is that forcing lna activation does not seem to have
> > any effect (via boot parameter or modules.autoload). It worked before I
> > upgraded and this might explain the drop in signal strength.  If i rmmod
> >
> > dvb_usb_dib0700 && modprobe dvb_usb_dib0700 force_lna_activation=1 I get
> > a higher signal strength. The second tuner is still worse than the first
> > (b800 compared to 9e00). Both tuner gets better signal strength than
> > before.
> >
> > Best regards,
> > Simon
> >
> >
> >
> > mythtv at tevens ~ $ cat
> > /sys/module/dvb_usb_dib0700/parameters/force_lna_activation
> > 0
> >
> >
> > Henrik Beckman skrev:
> > > Hi, =)
> > >
> > > The patch seems to solve the problem for me, I´ll have to run it for a
> >
> > > week or so to be 100%.
> > >
> > > Great work !!
> > >
> > > /Henrik
> > >
> > > These are my channels, the ones in bold had problems on tuner 2 before
> > > the patch.
> > >
> > > SVT2
> > >
> > ABC:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTER
> >
> > > VAL_1_8:HIERARCHY_NONE:1029:1028:5060
> > > SVT24
> > >
> > ABC:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTE
> > > RVAL_1_8:HIERARCHY_NONE:1249:1248:5170
> > > SVT2
> > >
> > Tvärsnytt:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD
> > >
> > > _INTERVAL_1_8:HIERARCHY_NONE:1029:1028:5050
> > > SVT2 Tal
> > >
> > txt:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_I
> >
> > >
> > > NTERVAL_1_8:HIERARCHY_NONE:1299:1026:1290
> > >
> > Barn/Kunskapsk.:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUAR
> > >
> > > D_INTERVAL_1_8:HIERARCHY_NONE:879:878:870
> > >
> > SVT1:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_
> > >
> > > 1_8:HIERARCHY_NONE:1019:1018:1010
> > > SVT1 Tal
> > >
> > txt:626000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_I
> >
> > >
> > > NTERVAL_1_8:HIERARCHY_NONE:1289:1016:1280
> > > TV4
> > >
> > Uppland:474000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_IN
> > >
> > > TERVAL_1_8:HIERARCHY_NONE:1049:1048:6100
> > >
> > TV6:474000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1
> > > _8:HIERARCHY_NONE:1079:1078:1070
> > >
> > >
> > >
> > > On 4/4/07, *olivier danet* < odanet at caramail.com
> > > <mailto:odanet at caramail.com>> wrote:
> > >
> > >     Hello
> > >
> > >     I posted a while ago (15 dec. 2006 ) a patch for the Nova-T 500
> > >     which may reduce your problem.
> > >
> > >     Search "[linux-dvb] [PATCH] Tuner calibration for some Nova-T
> > >     devices"
> > >
> > >     Regards
> > >     DO
> > >
> > >
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> > >     compte », vous recevrez au prix une remise de *20%.* L`offre est
> > >     valable jusqu`au 1. mai 2007
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> > >
> > >
> >
> >
> >
>
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