Re: Video termination Q

[Keith Doxey <ukha@xxxxxxxxxxx>]

Hi Steve,

It sounds as if the input the the capture card has a AC coupled
termination. It
is likely that neither device showed a picture as some video sources will
not
give a video output if there is no DC path to ground.

Try putting a 1K termination on the signal to see if that work, if not,
gradually drop until you get to a level that does work. You could just slap
the
75R terminator back on but the signal levels would then be too low and you
may
not get a picture at all.

Keith

www.diyha.co.uk
www.kat5.tv




Quoting Steve Morgan <smorgo@xxxxxxx>:

> Right, then...
>
> One of the cameras that I've got connected to an MV-1000, I'd also
like to
> connect directly to a video capture card in one of the servers.
>
> Here's what I thought I might be able to get away with:
>
> The MV-1000 has a T-piece with a 75R terminator at each input.
Presumably,
> therefore, it's a high-impedance input. I thought that I might be able
to
> replace the terminator with a cable going straight into the composite
video
> input on the video capture card. Since you normally just plug a video
source
> straight into this, I assumed that it would provide the termination
and
> everything would be hunky-dory.
>
> Imagine my suprise, if you will, when I found that the video capture
card
> doesn't see an input signal using this setup, though I've got a
feeling
> (which I can't confirm at the moment, 'cos I've repatched everything)
that
> the MV-1000 continued working correctly.
>
> So, what did I do wrong, and what can I do to fix it?
>
> TIA.
>
> Steve
>