pig 0 Posted March 11, 2015 Hi, I have installed a CCTV system with CAT5. At the cameras side I have a CCTV PSU box. When using this unit, I get a lot of interference and the picture flickers rendering it unusable. I then connected a power supply to a 13A socket and then connected this to the camera. The picture is then good, with only a few unnoticeable hum bars. The DVR is approx 50M away. Also, when I operate the cameras from the PSU box and then connect a test monitor to the camera, the picture is also good. Any ideas on what i'm doing wrong? Share this post Link to post Share on other sites
jeromephone 6 Posted March 11, 2015 sounds like a ground loop are you using baluns on the cat 5. a Share this post Link to post Share on other sites
pig 0 Posted March 11, 2015 Yes I am using passive baluns on both sides. Share this post Link to post Share on other sites
pig 0 Posted March 11, 2015 Any ideas how I might overcome this? Share this post Link to post Share on other sites
jeromephone 6 Posted March 13, 2015 Try and get the dvr and power supply on the same power line also ground the power supply and the dvr. If you find only one camera is causing the problem try instlling a ground loop isolater Share this post Link to post Share on other sites
Securame 0 Posted March 14, 2015 Yes I am using passive baluns on both sides. Pleased post pics of those baluns, and if possible picture of the camera's end, and the DVRs end. Share this post Link to post Share on other sites
pig 0 Posted March 15, 2015 Hi attached are some of the pictures as requested. I have tried a ground loop isolator on both ends of the run (not simultaneously) which solved the picture flicker, but some hum bars remain. This problem only occurs when using the CCTV power supply box. When I use a power supply plugged into a 13A socket, the picture is perfectly viewable with only a few unnoticeable hum bars. Could it be an issue with the power supply box? Regards. Share this post Link to post Share on other sites
the toss 0 Posted March 16, 2015 I'll get in before "securame" - those aint baluns. They are simply adaptors. Share this post Link to post Share on other sites
pig 0 Posted March 16, 2015 Hm maybe that's the joys of eBay.. Could you possibly show me an actual balun please? Thanks very much for your help. Share this post Link to post Share on other sites
pig 0 Posted March 16, 2015 Would these be suitable? Share this post Link to post Share on other sites
Securame 0 Posted March 16, 2015 Would these be suitable? Yes, those are baluns and would be suitable. Share this post Link to post Share on other sites
pig 0 Posted March 16, 2015 Thank you all very much for your help. Share this post Link to post Share on other sites
the toss 0 Posted March 17, 2015 They are marked with polarity for a reason - you wont do any damage if they are wrong but the picture will be about as good as you've got now. Share this post Link to post Share on other sites
