nikko

Sounds NVT.

Vacancy for either an experienced Designer or a technically proficient engineer looking to move into design. Full-time, based in Midlands UK. PM me in the first instance.

Greetings. What type of camera are they? If the picture appears ok on a straight forward monitor but not the dvr, then this tends to be due to poor sync or video levels from the cameras composite video output. Such levels are more critical to devices which "process" composite video such as dvr's but can be tolerated by simple devices such as your monitor. A composite video signal should comprise of 1vPP and 0.3vSYNC and a chromaburst level. I've known of 0.27vSYNC to cause tearing on the screen when going through processing, it can be that critical! The best way of checking levels is by an oscilloscope terminated to 75 Ohms, alternativley use a handy level meter,CLICK HERE. Secondly, try the camera by setting it up next to the dvr. If the problem goes away then distance is probably the issue, if it remains then the camera is the issue. If the problem is distance then you can try fitting lauch amplifiers. If the problem is the camera, try swapping it for a known good one to see if the problem clears. If so, you have a dodgy camera which needs replacing.