[linux-dvb] Kworld DVB-T 210 - dvb tuning problem

Hartmut Hackmann hartmut.hackmann at t-online.de
Fri Apr 11 00:08:17 CEST 2008


HI, Tim

timf schrieb:
> Hi Hartmut,
> OK, found some more spare time, but very, very frustrated!
> 
> 1) Tried ubuntu 7.04, 7.10, 8.04
>     Tried with just modules that exist in kernel (no v4l-dvb)
>    Tried v4l-dvb from June 2007 and tried current v4l-dvb
>    Tried with/without Hartmut patch - changeset 7376    49ba58715fe0
>    Tried with .gpio_config   = TDA10046_GP11_I, or .gpio_config   = 
> TDA10046_GP01_I,
>    Tried using configs in saa7134-dvb.c matching tiger, tiger_s, 
> pinnacle 310i, twinhan 3056
> 
>     # Australia / Perth (Roleystone transmitter)
>     # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
>     # SBS
>     T 704500000 7MHz 2/3 NONE QAM64 8k 1/8 NONE
>     # ABC
>     T 725500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>     # Seven
>     T 746500000 7MHz 2/3 NONE QAM64 8k 1/16 NONE
>     # Nine
>     T 767500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
>     # Ten
>     T 788500000 7MHz 3/4 NONE QAM64 8k 1/16 NONE
> 
> 2) I have these saa7134 cards:
>     - pinnacle 310i
>     - kworld 210
> 
>     This cx88 card:
>     - dvico DVB-T Pro hybrid (analog tv not work)
> 
> -   problem only occurs with kworld 210 in linux (works fine in WinXP)
> 
> 3) In WinXP, all channels, both analog tv and dvb-t found
> 
> 4) In linux, if start dvb-t first, never scans SBS - dmesg1
> 
> 5) In linux, if start analog tv first, stop, then start dvb-t, scan 
> finds SBS - dmesg2
>
a) The pinnacle 310i finds everything?
    It has the same chipset, but an almost perfectly handled tuner chip...
    This means that your initial config file is ok...
b) Does this mean that in case 4, all other channels are found?
c) Case 5: This finds everything?
d) What happens if you use the scan data of the pinnacle card?
    Does it tune SBS? Does it just take more time to stabilize?
    This can be understood.
e) Just to be sure: did you clarify the open point with .antenna_switch
    (i think so)
f) the kernel logs are as expected.
<snip>


> 6) Herman mentioned something called a "mode-switch" in the archives, 
> but not any description.

I guess he meant the switching between analog, radio and dvb-t. This is the
GPIO handling and card depending.

> I tried to find some data sheets for tda8275 tda8290 but only found the 
> publicity pdf file from Phillips,
> so at least I can see they go together, so I presume this "mode-switch" 
> is coded into those modules.
> But those modules work for all other cards, so now I'm lost again.
> 
> What else should I try?
> 
If my assumptions above are wrong, there is one other chance:
Recently i saw another card that does the (unusual) mode switching
like card 87. So to be sure, you might try to force this card type (be
aware of the antenna inputs, if in doubt, try both.

Best regards
   Hartmut



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