ofineo

Hi thank you for your replays. to your question, yes the cameras use baluns to convert the bnc to CAT5 and there is a 16 channel balun at the DVR end to convert it back to bnc just before it goes into the DVR

Sorry if it sounds a basic question. I have had some problems with a system that i did not installed, and after checking on the scope several of the cctv cameras are way less than 1Vpp and sync pulse are obviously less than 0.3v. The cables that are installed are CAT5 and the picture is no too bad but it creates some issues with the DVR which is a DM unit. For example every month a camera image duplicates on another channel.. I thought increasing the gain in the camera, some of the cameras have this facility in the camera menu, would increase the Vpp but it only wash out the picture in the monitor. How can i increase the Vpp or the Sync pulse that i get in the DVR end? Do i need an amplifier?