[linux-dvb] Re: DVB Newbie

[Chris Pitchford <nova-t@intrepid.cx>]

> On Tue, Jun 24, 2003 at 09:48:04AM +0100, Chris Pitchford wrote:
>
> > I then built a new, dedicated machine, with fresh OS install and put
> > the nova-t in there. I got random gibberish with a little picture on
> > most of the channels (infact all the QAM16 multiplexes) and highly
> > error prone streams on the rest. dvbstream did not work.
>
> [...]
>
> > I then moved the dvb card back into my workstation where it worked as
> > before, ok..ish..
>
> FWIW: So far it's the same here (or at least comparable):
>
> A KNC1 DVB-s card works (a little, some channels) with the Metzlerbros
> driver in one workstation but not at all in mine, which is odd 'cause
> it was intended for my WS ;-) Both machines are of nearly equal
> capabilities (clock: 1GHz, memory 512MB, CPU: AMD Athlon/Duron, VIA
> Chip set but different MB-manufacturers) and run exactly the same
> operating system (kernel and installation) as they are both disk-less
> (OK, they have disks but don't use them ;-)
>
> My guess so far has been that I have weak signals and that there is
> more electro-magnetic "smog" in my than in the other computer case.
> Unfortunately I have little time to dig into this, so the card has
> been quite useless the first two months of it's life.  The 5V-issue
> (see Holger Waechtler's posting a few minutes ago "Low Symbol Rate
> problem STV0299") also looks interesting.
>
> Michael
>

Thats quiet interesting.. I have a BT848 card (actually a hauppauge
WintvPVR but previously a wintv theatre and before that, a wintv fm) and
have always noticed vertical striations in the analog picture when using
the UHF receiver. The problem was, I have replaced everything surrounding
the bt848 card.. case psu mobo ram disks.. infact even the monitor.. but
this noise doesn't disappear.. just to be doubly sure, I ever moved house
recently and these lines remain! ;)

Its not a fault of the software since "moving" the aerial cable effects
the strength of this noise.. and also I dont see them when using the
SVideo or composite inputs..
Anyway, putting a very sensative receiver near an electrically loud
computer is never a wise move ;) a usb receiver might help with that..

however, in my case, returning the dvb card from my workstation to this
new computer, in which less than 5 minutes prior it had not worked in a
very big way, resulted in it working (well, the stream played and could be
watched for more than 1 second without errors)..

This is almost disappointing in some ways. If when the returning the dvb
card to this new box it still didn't work, that would atleast have been
something to work at considering the same OS install and the same card
worked in another computer it could only be the drivers/kernel/mobo..

I'm waiting for a longer aerial cable, or to have a new aerial installed
before I do much more work (hopefully this weekend) so I'm going to have
to wait to really start playing with this thing.. I'm also contemplating
trying the card under windows (shudder) on the same box.. just to see how
often errors occur. It would be interesting to see if the windows drivers
are any better at reducing the error count..

Cheers


cp




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