Hi,
I have a problem with the quality of the images of 4 of the 8 cameras in my home security system. The 4 bad cameras all have a haphazard pattern of horizontal or diagonal "trails" constantly streaking across the display. It appears to be some sort of signal interference. There is a pattern among the 4 bad cameras as they were the 1st set of 4 cameras I had installed. I later added a 2nd set of 4 cameras which work great. All of the 8 cameras are the same model since the 2nd installer replaced the 4 old cameras when he installed the 4 new cameras - only the old cables remained from the 1st group of 4, so I suspect the cables may be bad.
The 4 cables producing the bad images have "RG59 18 1/2 Copper CCTV Combo" stamped on the side while the cables producing the good images have "RG59/2 Coaxial 75 Ohm" stamped on them. In each case, the cable from the camera has been split just before reaching my DVR so that 1 of the paired cable "threads" terminates at the common 12V power source patch panel while the other terminates at my DVR.
My DVR is a GenIV G4-DCX8 and the installer described the cameras as Sony HAD CCD. The problem does not lie with the display or the DVR port, as I can swap the ports used by a good and bad camera, and the bad image moves to the new port. I am not aware of any electromagnetic interference at my home, nor is there much difference in the home environment when comparing the good and bad cameras (in 1 case, a good and bad camera are 2 feet from each other).
So, the problem is likely with the 4 original cables. Do I need to get new cables installed? Any other advice? Thanks!