samwise 1 Posted February 6, 2013 Hi all, Installed a system for a family member consisting of 3 cameras in an outside shed for watching animals calving etc. However, I am getting very bad interference problems that I can not seem to fix. First time working with cameras so any help would be greatly appreciated! So the system has 3 cameras. (2 dome IR and 1 bodied). These are inside 2 sheds and wired back to a central box using RG59 shotgun cable. (Carrying video and 12v power). Inside this box I have connected the 12v and crimped BNC plugs onto the RG59 cable. I have connected these BNC plugs into standard cat5 baluns and wired into a 10pair external cable that runs 80m to the house. Inside the house I have put baluns onto the cable and attached into DVR. On the monitor inside when viewing any camera I can see the images from the other cameras strobing across the screen. Looking online I can see what is refereed to as crossbleed or ghosting. Hope the picture below makes sense. Share this post Link to post Share on other sites
the toss 0 Posted February 6, 2013 Hi all, Installed a system for a family member consisting of 3 cameras in an outside shed for watching animals calving etc. However, I am getting very bad interference problems that I can not seem to fix. First time working with cameras so any help would be greatly appreciated! So the system has 3 cameras. (2 dome IR and 1 bodied). These are inside 2 sheds and wired back to a central box using RG59 shotgun cable. (Carrying video and 12v power). Inside this box I have connected the 12v and crimped BNC plugs onto the RG59 cable. I have connected these BNC plugs into standard cat5 baluns and wired into a 10pair external cable that runs 80m to the house. Inside the house I have put baluns onto the cable and attached into DVR. On the monitor inside when viewing any camera I can see the images from the other cameras strobing across the screen. Looking online I can see what is refereed to as crossbleed or ghosting. Hope the picture below makes sense. [attachment=0]cctv.jpg[/attachment] Is your 10pr cable back to the house a "differential twist" (eg cat5) ? Check for split pairs Share this post Link to post Share on other sites
samwise 1 Posted February 6, 2013 Is your 10pr cable back to the house a "differential twist" (eg cat5) ? Check for split pairs As far as i can see wires are all straight within the plastic insulation. (not twisted or paired). There are 10 white wires and 10 other colors. By split pairs do you mean broken/damaged pairs? Share this post Link to post Share on other sites
shockwave199 0 Posted February 7, 2013 Try hooking up each camera to it's own separate power adapter. Share this post Link to post Share on other sites
GrouchoBoucho 0 Posted February 7, 2013 On the monitor inside when viewing any camera I can see the images from the other cameras strobing across the screen. Looking online I can see what is refereed to as crossbleed or ghosting. sounds like cross-talk between the pairs. i'd suggesting using cat5e instead of this 10-pair; the pairs have different twists so you don't get signals induced into adjacent wires. Share this post Link to post Share on other sites
samwise 1 Posted February 7, 2013 Thanks guys. The 10 pair cable is buried underground so I really dont want to have to dig it up! Would doubling up wires cut down on crosstalk or would it just weaken the signal? Could it be related the a PSU problem? I have checked the power supply and its giving 12v properly on all wires and is more than rated for the job, amperage wise. Share this post Link to post Share on other sites
GrouchoBoucho 0 Posted February 7, 2013 try stringing a piece of cat5e across the ground and connect it up, see if that solves your problem... if so, at least you know what it is, even if it's a pain to deal with. if not, then you can rule out that it's the type of cable. doubling up pairs won't help - there should be one pair per balun. Share this post Link to post Share on other sites
tomcctv 190 Posted February 7, 2013 hi. also look at your baluns ........1000s on ebay and amazon say there baluns but are not Share this post Link to post Share on other sites
samwise 1 Posted February 8, 2013 Thanks for the reponses. Ran a cat5 cable across the ground today and sure enough it solved the problem! Twisted pairs ftw! 1 Share this post Link to post Share on other sites