Done11 0 Posted January 13, 2013 The monitor is located 700" away from the DVR in a guard tower. I'm using the BNC output of the DVR. I ran RG59. Part of the run is on top of a metal building with two large halogen lights mounted on top lighting up the parking lot. When the lights are off the picture is perfect but when the lights are turned on the picture starts to shake in a wavy pattern then scrolls downward then goes back to perfect it repeats this sequence till the lights are turned off. At two points in the run I had to use a BNC to BNC connector. Not sure if it's RFI or electrical induction, etc??? Anyone have suggestions on how to fix this problem? Share this post Link to post Share on other sites
cctvmann 0 Posted January 13, 2013 The monitor is located 700" away from the DVR in a guard tower. I'm using the BNC output of the DVR. I ran RG59. Part of the run is on top of a metal building with two large halogen lights mounted on top lighting up the parking lot. When the lights are off the picture is perfect but when the lights are turned on the picture starts to shake in a wavy pattern then scrolls downward then goes back to perfect it repeats this sequence till the lights are turned off. At two points in the run I had to use a BNC to BNC connector. Not sure if it's RFI or electrical induction, etc??? Anyone have suggestions on how to fix this problem? how close is the rg59 to the mains Share this post Link to post Share on other sites
Done11 0 Posted January 13, 2013 At two points in the run the RG59 passes over the emt that supplies the lights. Then it runs about a foot away from the emt down the wall. Share this post Link to post Share on other sites
Done11 0 Posted January 13, 2013 If your referring to the mains that supply power to the electrical panel for the building it's not close to it at all. Share this post Link to post Share on other sites
cctvmann 0 Posted January 13, 2013 is the mains supply single phase (230v) or three phase (415v) Share this post Link to post Share on other sites
tomcctv 187 Posted January 13, 2013 700 ft (over 200m) without a booster with rg59 Share this post Link to post Share on other sites
Done11 0 Posted January 13, 2013 is the mains supply single phase (230v) or three phase (415v) The breaker for the lights is on a single phase sub panel. There is a three phase main. They are both in the same building as the wire run. Share this post Link to post Share on other sites
Done11 0 Posted January 13, 2013 700 ft (over 200m) without a booster with rg59 The first thing i did was add a booster. I put it at the DVR then at the monitor and in the middle of the run. Didn't work. I even ran a test cable through the warehouse instead of on the roof so the cable wasn't touching the building or near the lights. That didn't work. The picture is great during the day or night as long as the lights are not turned on. Share this post Link to post Share on other sites
shropna 0 Posted January 15, 2013 This can be ground loop problems. Try to use ground loop isolating transformer on video cable. Share this post Link to post Share on other sites
the toss 0 Posted January 15, 2013 You should ALWAYS insulate you BNC/BNC connectors from ANY metalwork. Even it the metalwork is not earthed it can act as a pretty good antenna for all sorts of RF noise. Share this post Link to post Share on other sites
Done11 0 Posted January 15, 2013 All three buildings on this side of the plant are metal. All the lights are mounted to metal poles and the poles are mounted directly to the metal building. I'm guessing this is causing all the problems. I'm ready to just run a catv and put a computer in the guard tower and have them use the CMS software to see the cameras. I really would like to solve this problem but I'm running out if options. Share this post Link to post Share on other sites
shockwave199 0 Posted January 15, 2013 You could try a bnc surge protector such as this at the dvr end of the coax and ground it to the dvr. Might clear the problem, might not. Share this post Link to post Share on other sites
GrouchoBoucho 0 Posted January 16, 2013 pull a length of utp (cat5e, or even cat3 will do), then put baluns on both ends (*real* baluns, not the crappy ebay utp-to-coax adapters so many people seem to end up with). the twisted pair has noise-rejection properties of its own, and the balanced line created by the baluns adds another level of noise rejection to that. Share this post Link to post Share on other sites
Done11 0 Posted January 17, 2013 I was thinking I would run rg6 but since you suggested cat5 I will run cat5 also to see if either one would solve my problem. Thanks for the reply. Share this post Link to post Share on other sites
the toss 0 Posted January 17, 2013 Why do you think RG6 will solve your problem , it may make it worse. I would suggest you read up on RG6 vs RG59 particularly with regards to shielding capabilities. Share this post Link to post Share on other sites
Done11 0 Posted January 19, 2013 I want to thank all you guys for replying with suggestions. After trouble shooting this problem for two weeks and trying all the suggestions. I decided to try a ground loop isolator. Even though some people said they don't work and some say they do. Well.......it WORKED!!!!! This little $15.00 (US) part solved the problem. Share this post Link to post Share on other sites
shropna 0 Posted January 21, 2013 I want to thank all you guys for replying with suggestions. After trouble shooting this problem for two weeks and trying all the suggestions. I decided to try a ground loop isolator. Even though some people said they don't work and some say they do. Well.......it WORKED!!!!! This little $15.00 (US) part solved the problem. I'm was right Share this post Link to post Share on other sites
