[vdr] Re: burned DVB-s

["Rienecker, Fa. Evenio, ITS P, M" <C.Rienecker@deutschepost.de>]

If I understand you correctly you connect both composite to vcr and video
out to tv, right ?
Disconnect one of them and your picture will be as bright as it should be
(at the other connection). The different connectors are electrically the
same resulting in a voltage drop on if you use both simultanously.
Same applies if you use J2 and composite out on a DVB-S rev 1.3.

Now to the antenna cables:
Actually you don't know if the shielding is grounded. It only represents the
referece point for the AC-Signal. It is very well within the specs if there
is a DC offset. The PC on the other hand is (supposed to be) grounded well
via the power plug.
Actually I once connected the antenna to a DVB-C that was not plugged into
the PC and subsequently killed it.

The other point I have yet to think about are ground loops. Just think about
connecting the antenna to the vcr, the vcr to the tv, the tv to the antenna.
If just one of the two (vcr or tv) pulls the shielding to ground you'll have
quiet some DC-current going around your system.

CU,
Christian.


> -----Original Message-----
> From: Dennis Noordsij [mailto:dennis.noordsij@wiral.com]
> Sent: Friday, October 18, 2002 11:55 AM
> To: vdr@linuxtv.org
> Subject: [vdr] Re: burned DVB-s
> 
> 
> 
> > That should be enough except if you start to unplug it and 
> replug it while
> > the system has power....
> >
> > CU,
> > Christian.
> 
> Oops, I do that sometimes!
> 
> My DVB-C's came without cables, so I put something quick  together to see
if it 
> all works. Using video out, audio L + r, and a GND (shared  between the
other 
> 3 signals). Thin long wires unfortunately. Composite to VCR. Picture is
way 
> too dark, sound is fine, and somehow it takes over the VCR, as in, if you 
> change from the input to a normal cable channel, the input signal is mixed

> with the normal channel. If you use the OSD menu of the VCR, is scrolls
all 
> over the screen. 
> 
> Anyways that's beside the point :-)
> 
> How about the antenna signal (cable) going to the DVB cards, to the VCR,
and 
> to the TV. On the PC side their shells are grounded to the chassis of the
PC 
> case. Is that a sufficient GND?
> 
> Also, does dark composite signal sound like bad ground? :)
> 
> Cheers
> Dennis
> 
> 
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