[linux-dvb] Re: grr.. Any DVB-T adaptors which work reliably?

["Tomas Sävenstedt" <tomas@ladata.se>]

Hi Ragge

I have the same card as you have but now it works OK.
When I used the offical pre2 driver I had disturbances in both sound 
and picture but now when I:m using the .25 driver with your nice plugin 
for undertext all distubances are gone.

The card likes a stable strong signal from the antenna. When disturbed 
for some reason VDR often crashes. I then need to use tzap to tune in 
the card again. I haven´t had time to investigate what is the problem.

Now to my question: As you pointed out many cannels in Sweden are 
coded. 
VDR works OK for the free SVT channels but I can´t get it work for the 
other coded channels.
My ViaAccess card reader is recognized by VDR and I can open the card 
under Setup in VDR. But no decoding.

The advice from the VDR people was to use firmware decoding but I just 
couldn´t get that to work. VDR behaves strangely.

I don´t know if this is a question for the VDR mailing list but I hope 
you have solved the problem.

Tomas Sävenstedt

citerar Ragnar Sundblad <ragge@nada.kth.se>:

> 
> --On den 30 juni 2003 22:44 +0100 Edward Wildgoose 
<ed@wildgooses.com> 
> wrote:
> 
> > I just can't get this wretched TT DVB-T 1.2 card to work reliably
> > at all!!
> >
> > Has ANYONE managed to get a DVB-T card working with VDR in a 
completely
> > reliable way?
> 
> I have had a bunch of problems with my TT DVB-T 1.2 too.
> It now works quite reliably, but it still picks up of
> interference from somewhere, I have audio clicks and picture
> problems on some, but not all, channels. I very seldom have
> firmware craches now.
> 
> - At first I had lots of problem with just getting it to
> tune at all. I think that it needs a very stable 12V that also
> should preferably be a little bit above 12V, not 11.8V or lower.
> I bought a new power supply and moved away a 12V fan connection
> from the main board and got better results with the card.
> I think the DC/DC converter for the tuning power is to weak,
> it is some homebrew with a 555, and the voltage dips at higher
> frequencies.
> 
> - With a oscilloscope I see strange spikes on the I/F line from
> the tuner to the demodulator. They are spaced at about 18,3MHz
> which happens to be a third of the demodulators clock frequency.
> Though it could be something else that I pick up with the scope
> some strange way, I suspect that it is real and that it is a
> hardware bug. Sadly, data sheets on these things are hard to
> get, I suspect that there is a biasing problem on the demod
> input or something like that, at least I would like to have
> enough documentation to be able exclude those ideas that I have.
> 
> - I have lines traveling down the tv screen when using the
> composite output from the DVB-T card. I heard from another guy
> that has both a DVB-T and a DVB-C that he has the same on the
> DVB-T, but that the DVB-C is OK.
> 
> - When I have the driver loaded/firmware booted/whatever does it,
> my last tv in the antenna chain gets vertical or sloping lines
> over the screen on analog channels. When I unload the driver,
> the lines disappear.
> 
> All in all, I am not very impressed by this card.
> 
> 
> Now when I have some DVB-T friends on the line:
> 
> Usa-x says that their DVB-T 1.2 cards look like this:
> <http://www.usa-x.org/1shop/popup_image.php?pID=7&language=en>
> My 1.2 card does not look like that, it has an ALPS tuner and
> a SP8870 demodulator on the main board, like the one here:
> <http://www.technotrend.de/english/products/pcproducts2-2.html>.
> Does anyone know if the design has changed and they don't
> really mean 1.2, or if they just have wrong picture?
> 
> I have also been thinking of bying a Nova-T to see if I at least
> can get better reception with that. There is a possibly new one
> called 1.3, which could be studied here:
> <http://www.usa-x.org/1shop/product_info.php?
cPath=3&products_id=34&languag
> e=en>, pdf here: <http://www.usa-x.org/1/T1300.pdf>.
> This one looks like it could at least be fitted with a
> CI connector (yes, some DVB-T channels in Sweden are encrypted).
> Does anyone know if one gets this card if you buy a Hauppauge
> Nova-T, or if you get one without a CI connection?
> Does anyone know if this card is supported by the driver?
> Any recommendations?
> 
> /ragge
> 
> 
> 
> 
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> 



Kets


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