[linux-dvb] Tuning problems

Ian W Roberts ianwroberts at internode.on.net
Sun Jun 29 13:17:10 CEST 2008


stev391 at email.com wrote:
> Ian,
>
> Try updating to the latest scan file from the dvb-apps mercurial.  
>
> Channel 7 have changed their parameters in the last year and some tuners automatically try other combinations then instructed, that is why it is working with one and not the other.
>
> The new Channel 7 parameters are:
> # Seven
> T 177500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>   
Brilliant, that worked! :-)

I had tried changing the guard interval to 1/16 which seemed to change 
the behaviour subtly but didn't achieve successful tuning. Changing that 
4 parameter (FEC High?) to 3/4 as well means my device works fine now. 

Thanks

ian
> As for the SBS problem it might be just poor reception or the tuner wasn't designed for the Australian frequencies correctly.
>
> Regards,
> Stephen.
>
>
>
> <Original  Message>
> Dear Linux-DVBers,
>
> I now own two USB DVB-T receivers (dongles): a Gigabyte U7000-RH and a
> digitalNow tinyUSB2.
>
> I use them on my Kubuntu 7.10 workstation.
>
> I've had the digitalNow for a year or so and it has been working fine
> (and easy to get going) with kaffeine except that I couldn't receive SBS
> reliably (in Adelaide, Australia) although I was able to tune to it from
> time to time. With the Tour de France starting next week (coverage
> broadcast by SBS), I took a punt yesterday and bought a Gigabyte
> U7000-RH and, yes, it too was easy to get going, and, luckily, receives
> SBS nicely -but it can't tune to Channel 7 at all!
>
> My kaffeine installation now has a channel list that covers all the
> local terrestrial TV stations. If I connect the digitalNow device, I can
> watch 2, 9, 7 & 10 and if I connect the Gigabyte device I can watch SBS,
> 2, 9 and 10.
>
> I'm presuming that means that by channel tuning data is OK. I don't know
> whether it's relevant, but I notice that SBS seems to be the highest
> frequency local station and Channel Seven seems to be the lowest. There
> seems to be a problem with both devices at the opposite ends of the
> frequency range.
>
> Any suggestions? (other the juggling the two devices!)
>
> bye
>
> ian
>
>      # Australia / Adelaide / Mt Lofty
>      # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
>      # ABC
>      T 226500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>      # Seven
>      T 177500000 7MHz 2/3 NONE QAM64 8k 1/16 NONE
>      # Nine
>      T 191625000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>      # Ten
>      T 219500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>      # SBS
>      T 564500000 7MHz 2/3 NONE QAM64 8k 1/8 NONE
>
>
>   
>
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-- 
Ian W Roberts
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