S-video Ripple on screen right after horizontal sync

[mikal]

Can anyone tell me what might be causing this problem with the ripple on the left side of the screen? www.pcb-experts.com/P29.jpg

 

[karesz]

This means reflexions in your Video-Amplifier...

Exactly: the source can be a not so perfect Amplifier design (Frequency characteristic of your Amp is n`t linear...), but if it was in the past "better"; than may be "you have become" a wrong connector Shielding/ termination...
As first; check your cables for right montage of shieldings / earths or GND wires or some condenser are altered in the circuit.

K.

 

[mikal]

Thanks for the feedback. This is actually a new design. It's a multi component solution that takes CCD and formats it to s-video. There's a 6dB amp in after the final amp.

I kept thinking the same thing. It must be some anomaly created after the conversion to s-vid format... after ( or right before) the final amps.

 

[karesz]

Hi mikal,

are you sure, that your monitor is abs. OK, or do you have the same "wrong" picture on other types of monitor too?
How is your picture if you pull the s-video signal out?
Hopfely you can see an more or less black screen...

I`m not so sure, that what wrong is; is not your monitor, and your video signal is OK.

Often has the horizontal saw- tooth signal same "starting problems" (called: ringing) and the more older(not CCD) cameras have had a ca 5-10% of start not "pictured"!
There are over controlled, and so on the time axe (horizontal) from theoretical ca. 58 usec (50 Hz H-signal period=64 us) onl so at 50-55 usec displayed...
K.