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

[Olaf Brömme <ob@oli-be.de>]

Am Donnerstag, 1. Mai 2003 15:19 schrieben Sie:
> ----- 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

Hi Christian,

yes that is a hot hint and it's really the reason.
I removed the antenna cable from Nova card and the problem disappears.
What a pitty, i have to get by with one DVB card only until further notice, 
because there are only two PCI slots in the SS40G-cover (close together !!!).
I will test some solutions with metal sheets for screening each other in 
future.

thanks again Olaf


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