richterscale 0 Posted April 3, 2014 Hello guys. I've recently installed a relatively cheap system (compared to IP camera systems out there) and I have interference problems. I don't have any experience with CCTV cameras so from what I've read I think I need Ground loop isolators for all of the cameras in my system. I installed one of these on the camera with the longest cable running from the DVR with some decent results, but not the elimination of all of the interference. What do you guys suggest I do next, install ground loop solators on all of the camears or is there another option? Thanks Share this post Link to post Share on other sites
the toss 0 Posted April 4, 2014 That interference is not caused by an earth loop. It is a Moire interference pattern and can be caused by a thousand different things just some of which are - pixel size , image sensor quality , image sensor scan rate , colour subcarrier harmonic interference. They are often caused by repetitive vertical or horizontal items in the picture (like fence posts) that cause an interference pattern due to pixel size and scan rate. The easiest way to avoid them is using high quality sensors & keep outside interference to a minimum. I'm sure everyone is familiar with the "strobe effect". If you understand how the strobe effect works then you are well on your way to understanding the Moire effect. Share this post Link to post Share on other sites
richterscale 0 Posted April 6, 2014 I had never heard of the Moire effect. Basically I just need better quality cameras next time I get around to investing in a better system because I can't control the things the sensor sees in the environment. I guess it makes sense because on some days the image clears up on his own for no apparent reason. Thanks for your reply! Share this post Link to post Share on other sites
the toss 0 Posted April 7, 2014 I had never heard of the Moire effect. Basically I just need better quality cameras next time I get around to investing in a better system because I can't control the things the sensor sees in the environment. I guess it makes sense because on some days the image clears up on his own for no apparent reason. Thanks for your reply! google is your friend Share this post Link to post Share on other sites
SunnyKim 2 Posted April 8, 2014 The same brand for all cameras?. Plug a camera output directly into your TV set and check the video quality. Note TV carries the much better video signal processor than stand alone DVR. Share this post Link to post Share on other sites
