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

Simon Lundell simon.lundell at his.se
Sat Apr 7 20:31:56 CEST 2007


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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>





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