Stuart 0 Posted March 20, 2009 I purchased 2 of the Nuvico CV-SD21N-L night vision cameras and I am having problems with power/video connections. These cameras are listed as duel voltage cameras. If I connect them to my existing Siamese cable they will not operate or show an image on my DVR. When I connect the 24 volt included power supply and hook them to my television via a BNC/composite adapter they work okay. When I connect them with a 1500m 12vdc power supply and connect them into a wall socket and connect them via BNC/composite on my television they work okay. At first I thought I had an issue with my DC power supply box So, I tried connecting the 1500m 12vdc power supply specifically to the cable that I wanted to use the Nuvico on. No picture!! Now I do not know if it is power or video is causing the problem. This is a dilemma, because I have 6 other cameras operating off of identical cable and connections. Actually I connected a spare camera to the very same cable that has very high resolution and over 40 leds and it worked just fine. I cannot isolate the culprit here! Is it the video or the power connections that is not compatable with these cameras? Or, is it my DVR, which by the way operates very well with my other 6 high res infrared cameras. Please assist! Share this post Link to post Share on other sites
scorpion 0 Posted March 20, 2009 Take a technitions monitor, or a TV with the yellow video in connector, and go out to the camera itself, and plug the video out of the camera in to your monitor, or your TV. If you have video then the power side is ok. The video cable is the issue. You might have a sliver of the braid wrapped around the center conductor, or the center conductor is touching the side of the BNC connector. If you do not have video then it is the power supply, power cable, or the camera itself. What do you think? Share this post Link to post Share on other sites
Stuart 0 Posted March 20, 2009 Well, the camera works fine when I bring it inside and plug it into the wall via 12 v or 24 v adapter, and use my television. It is when I connect it to the existing cable outside that it does not work, even when I replaced the power supply with the 1500m adapter. Your ideal of taking a monitor or television outside to the actual place where the problem is might be a good one to isolate the issue to one place. Kind of weird that other cameras work fine off of the very same cable. Bye the way I also tried a lower miilamp dc adapter inside the house with the televion and the camera would not work. It only worked with the 1500m or the 24 volt. Thanks man!! Share this post Link to post Share on other sites
Sawbones 0 Posted March 20, 2009 One additional thought: Depending on how long your power cable is (and the gauge of the wire), you may be getting enough voltage drop over that wire to render the camera non-functional. Take a multi-meter with you when you check out the camera connection, and test the voltage at the camera end. Share this post Link to post Share on other sites
Stuart 0 Posted March 20, 2009 Thanks, I too had considered the cable quality as suspect. Maybe the Nuvico cameras require a better quality cable than the other generic cameras that are using the same cable. First, as sugested by the last response, I need to make sure that it is either video or power that is the real issue. Share this post Link to post Share on other sites
Oxide.Blu 0 Posted March 25, 2009 Depending on how long your power cable is (and the gauge of the wire), you may be getting enough voltage drop over that wire to render the camera non-functional. That's my thought, too -- voltage drop. DC voltage drops faster than AC -- possible the AC will work, the DC won't. When calculating a conductor's length, be sure to include both directions, power source to the camera, and from the camera back to the power source. It's a round trip. Share this post Link to post Share on other sites
