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

Henrik Beckman henrik.list at gmail.com
Sun Apr 8 09:31:43 CEST 2007


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
> >
> >
> >     */Avez-vous déjà en pensé d`envoyer des SMS de l`internet?/*
> >     Lorsque vous entrez ce Code Promo *14071789* dans l`ordre du grand
> >     paquet de 70 extra SMS sous « SMS hors-forfait » dans « mon
> >     compte », vous recevrez au prix une remise de *20%.* L`offre est
> >     valable jusqu`au 1. mai 2007
> >     Cliquez-ici pour vous inscrire chez Caramail
> >     <http://caramail.lycos.fr/>
> >
> >
>
>
>
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