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

[Dave Chapman <dave@dchapman.com>]

On Tuesday 23 April 2002 05:59, you wrote:
> As far as I know no one has got DVB-T to work in Australia.  I know this
> has been talked about before but there has been no definite answer. 
> 
> There are people here reporting on the aus.tv.digital newsgroup that the
> DVB-T cards that are available do not work here.

Have they been using the supplied Windows software, or the Linux software?  
The Windows software probably doesn't allow you to fine-tune the tuning 
parameters.

> There seems to be a few potential/actual problems:
> 1. In most places in Australia DVB-T is being brodcast on VHF channels
> 2. It would seem that as Australia uses 7Mhz channels (PAL-B) in the UHF 
band
>    where as most countries use 8Mhz channels in UHF (PAL-G)
> 3  Others I perhaps don't know about.
> 
> Now, luckily, I live in a city where all the digital broadcasts are on
> UHF channels, so problem 1 goes away!
> 
> So how about 2?

The L64781 COFDM demodulator used in the Nova-t cards supports 6, 7 and 8 MHz 
channels.  From looking at the specifications, it seems to support all 
conceivable forms of DVB-T broadcasts, so that shouldn't be a problem.  The 
Linux driver allows applications to set all these paramaters.

> If I understand correctly the nova and the tecnotrends DVB-T cars are
> essentially the same?
> 
> I would guess that the specifications for the tuner chips used on these
> cards would answer these questions.  If so can someone (convergence?)
> have a look?  Or at least point me at the specs for the cards?

I don't know about the actual tuner, but the "COFDM Demodulator" in both 
cards is the L64781 which was co-developed by LSI Logic and BBC Research and 
Development.  A search at www.lsilogic.com will give you information on this 
chip, but I couldn't find the actual datasheet (but I downloaded it from 
there last year).

Regards,

Dave


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