[vdr] Re: problem using 2DVB-cards with vdr

[Olaf Brömme <ob@oli-be.de>]

Am Donnerstag, 1. Mai 2003 16:37 schrieben Sie:
> Hmm these frequencies usually suffer from DECT telephones, i cont use
> them at all, i have to use the austrian service from sat1/pro7/kabel1
> so i cant watch n-tv,dsf and berlin.tv, but i can stand that..
>
> please check by totaly unplugging all dect telephones and base-stations.
>
> if you cant do this, you can use a analog reciever to croscheck,
> on analog sat (astra) n-tv (ANALOG) also gets influenced (2 "lines"
> appear when a dect phone operates to close to the cables or the reciever
> as well. afaik those problems cant be solved be better cables ot
> dish-tuning(tried that for a realy long time!), but only by extra
> shielding (expensive!!) from the LNB up into the PC....
>
> like i said, i lost some tv channels to my new DECT PHONE, sometimes
> these channels do work, since DECT uses bursts and continued frequency
> jumping, but sometimes not (1.FC Köln, Aufstiegsspiel bei DSF grrrr...)
>
> Kind Regards,
>
> Onno Kreuzinger

>Hi Onno, Christian,
thanks for your mail.
About DECT i thought so too, but a borrowed digitalreceiver works very well,
and unplugging the DECT telephone takes no effect.

Probably Christians idea will be the reason.
Concerning this, i removed the antenna cable fom the Nova-card and ?
That's it !
But there is no chance to change anything, because there are only two PCI 
slots in the SS40G-cover.
I will test some solutions with metal sheets for screening each other in 
future.

best regards Olaf

> Christian Vogt schrieb:
> > ----- Original Message -----
> > From: "Olaf Brömme" <ob@oli-be.de>
> >
> >>Hi,
> >>i've got a problem using 2 DVB-cards (HPP Nexus-s + Nova-s) with vdr
> >
> > (1.1.29).
> >
> >>Some times the tv-program interrupts, tv-screen becomes black and tone is
> >>lost. After nearly 10...50 seconds both come back and works fine for a
> >
> > while.
> >
> >>It takes place on some channels only, watched on Pro7, Sat1 and K1.
> >>Noticeable: all on Astra transponder 104 with vertical polarisation.
> >>If the dvb-driver (2003-04-27) runs lonely (switched to one of these
> >
> > stations)
> >
> >>without vdr, the problem doesn't appear. If the Nova-s is removed, (vdr
> >
> > and
> >
> >>Nexus-s only) everything is all right too.
> >
> > Hi Olaf,
> >
> > just an idea:
> >
> > I've read some time ago that there ist a (hardware) problem with two sat
> > tuner modules located near each other (like if you install two cards in
> > the same computer). If both tuners are tuned to the same transponder
> > frequency, there was a kind of interference, resulting in a lost sync for
> > both of the tuners. The solution for this was to tune both tuners to a
> > slightly different fequency (don't know if this solution is implemented
> > in the driver or vdr...). Maybe, in your system, the frequency tolerances
> > for the tuners are in a way that an attempt to tune to slightly different
> > frequencies result in exactly the same frequency in reality.
> >
> > You may see this behavoiur only with vdr, because its EPG scanner switch
> > channels on the secondary card while you're watching with the primary.
> >
> > Hope this helps a bit...
> > Christian



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