Hi,
I have found with some video equipment, I have had to increase the active video from 0.7V to 1.0V for the monitor to receive a decent signal, otherwise the signals tears, similar to the pictures shown. I built a variable gain video amplifier to achieve this but there must be ready made composite video amplifier available.
The other possible issue is incorrect cable type, using 50 Ohm cable into a 75 ohm load, reduces the signal by one-third giving weird effects. Proper video cable should be 75 ohms by the way.
Ian
