[linux-dvb] Re: DVB-T in Australia

[Malcolm Caldwell <malcolm.caldwell@ntu.edu.au>]

On Mon, 2003-03-24 at 16:24, Holger Waechtler wrote:
> Malcolm Caldwell wrote:
> > Hello,
> > 
> > First a quick question: has anyone been able to get a nova-t to work in
> > Australia yet?
> > 
> > I have been helping a user via email/phone (he is on the other side of
> > the continent) who is new to linux try to get his nova-t card to work
> > here in Australia.  He purchased the card in the UK and has been able to
> > get it to work since.  He has tried to do this under windows with no
> > success and so now is trying linux.
> > 
> > We have go the system to the point where the drivers
> > (linuxtv-dvb-1.0.0-pre1) are installed, the card is detected etc and
> > dvbtune (from dvbtools on sourceforge) runs.
> > 
> > When the card is tuned to the correct frequency with what is apparently
> > the correct parameters for the transmitter.  dvbtune reports that there
> > is signal and carrier but fails to get any further.  He tried changing
> > various parameters (frequency/bandwidth/transmission etc) and only got
> > the expected result of no carrier and/or no signal.
> > 
> >>From this it would seem that perhaps the frontend is not really working
> > with 7Mhz.
> 
> I'm not sure if the Grundig frontend (your card has one, right?)

I have asked Mark (its his computer and card) to confirm this.

>  is able 
> to tune to VHF channels (you try to, right?).

I am sorry - I should have mentioned:  We are trying to tune a UHF
channel.  I assume that if this card is going to work at all in
Australia then UHF channels should be the simplest to get working.  If
they work then we can try VHF as well.  There are places in Australia
where DVB will only be broadcast on UHF so a card with non-working VHF
is still useful as long as UHF works.

>  Maybe with other PLL 
> settings this is possible, maybe it's really a limitation of the analog 
> tuner in the frontend.
> 
> Is it possible to tune to these channels using the Windows driver?

No.

> Please try to modify the tsa5060_set_tv_freq() function as shown below 
> and report if it works for you.
> 
> thanks,
> 
> Holger
> 
> 
> 
> /**
>   *   set up the downconverter frequency divisor for a
>   *   reference clock comparision frequency of 166666 Hz.
>   *   frequency offset is 36125000 Hz.
>   */
> static
> int tsa5060_set_tv_freq (struct dvb_i2c_bus *i2c, u32 freq)
> {
>          u32 div;
>          u8 buf [4];
>          u8 cfg, cpump, band_select;
>  
> 
>          div = (36125000 + freq) / 166666;
>          cfg = 0x88;
>  
> 
>          cpump = div < 175000 ? 2 : div < 390000 ? 1 :
>                  div < 470000 ? 2 : div < 750000 ? 1 : 3;
>  
> 
>          band_select = div < 175000 ? 0x0e : div < 470000 ? 0x05 : 0x03;
>  
> 
>          buf [0] = (div >> 8) & 0x7f;
>          buf [1] = div & 0xff;
>          buf [2] = ((div >> 10) & 0x60) | cfg;
>          buf [3] = cpump | band_select;
>  
> 
>          return tsa5060_write(i2c, buf);
> }
>  
> 
> 



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