[linux-dvb] Re: vdr: picture quite dark on tv

[Christoph Ackermann <christophackermann@t-online.de>]

Hi Thilo,

Thilo Wunderlich wrote:
> 
> Hallo Christoph,
> > the output-cirquit of the Siemens-Card is quite good an perfect aligned.
> 
> weiss ich :)
> 
> > Maybe you have set a "Double Termination" at your TV!?
> 
> was ist das ? Ich hab nen Cinch auf Scart Kabel dran.

Each source have been terminated with a 75 ohm resistor at the sink.
Most of all TV-sets have built in resistor of about 68-75 ohm and if you
use an additional resistor in your SCART-cable it results in a reduced
videolevel of about 66% = 0,46V. This MAY be the reason for your darker
picturequality. For a simple check, please plug in the connector in your
"old fashioned" VCR an view the result. 
If its better the failure might be a double termination, because the VCR
have an "Automatic Gain Control" circuit to elminate the loss of cable.
If not, its recommendet to mesure the level of Video(700mV) and
Sync(300mV) with a scope.

Regards,
 Christoph

"... and all the hippies work for IBM or take control ..."
Joe Jackson - Big World, 1987


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