mitsifto123 Posted August 25, 2008 Posted August 25, 2008 Hi, upto now i have used RG59 for my installs, on this paticular install client wanted audio on every channel so i went with CAT5e utp cable with passive video baluns (see attached pics). I am sending power to the cameras using the same cat 5 cable, the power is being suppied by a 16 way PSU (individually fused) I am having poor picture quality like distortion, lines across the screen, wired thing is when i move the bnc on the video balun on the dvr end the picture gets better??? Anyone come accross anything like this??? any suggestions? please help i am stumped on this. Thanks in advance
kensplace Posted August 25, 2008 Posted August 25, 2008 Loose connection somewhere? If you move something and it improves it sounds like something is loose.
brizee Posted August 25, 2008 Posted August 25, 2008 could be interference that you are grounding when you touch the bnc. I've had this a lot with NVT, which have an earthing point. If you leave the ground off you often get travelling lines across the screen. I never run power with signal anymore, too risky. Clearview hum eliminators will clear your pictures up but theyre not cheap.
Cubit Posted August 25, 2008 Posted August 25, 2008 Had the very same only last week. Electrics in the place a right mess. Humbug sorted it.
james.wilson Posted August 25, 2008 Posted August 25, 2008 decent baluns should have isolation. What sort of lengths you got, what voltage is at the cams, and have you confirmed you have no crossed wires. Id bet its related to the el-cheapo baluns. Never ever had a problem with NVT securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
SUBS Posted August 25, 2008 Posted August 25, 2008 Have you checked to see if you have a full 12V at the camera end ? Personally I dont trust rj45 with any real of current. If your cameras have ir lamps, try disconnecting them. I have sen those bluns on ebay for a couple of quid a pair, and have tried a couple for video distribution over the customers network cabling without any problems. but I'd be wary of cheapo stuff like that, if its a multi camera install.
justin Posted August 25, 2008 Posted August 25, 2008 Hi, upto now i have used RG59 for my installs, on this paticular install client wanted audio on every channel so i went with CAT5e utp cable with passive video baluns (see attached pics). I am sending power to the cameras using the same cat 5 cable, the power is being suppied by a 16 way PSU (individually fused)I am having poor picture quality like distortion, lines across the screen, wired thing is when i move the bnc on the video balun on the dvr end the picture gets better??? Anyone come accross anything like this??? any suggestions? please help i am stumped on this. Thanks in advance 1st check the balun straight on the monitor input. If this is ok you could have a distance issue when connecting to the DVR as these will need a stronger signal. It would not supprise me if you have a faulty BNC conector within the DVR. Power will always be a problem over cat5 unless runs are VERY short.
mitsifto123 Posted August 25, 2008 Author Posted August 25, 2008 1st check the balun straight on the monitor input. If this is ok you could have a distance issue when connecting to the DVR as these will need a stronger signal. It would not supprise me if you have a faulty BNC conector within the DVR. Power will always be a problem over cat5 unless runs are VERY short. hi guys, thanks for all your replys, the longest cable run is about 50 meters, I think its a grounding / power issue as i have just connect one of the cameras via a seperate adapter and the picture is allot clearer and even if you move the bnc end of the balun now it does not seem to affect the picture? where can you get a humbug from them please
SUBS Posted August 25, 2008 Posted August 25, 2008 hi guys,thanks for all your replys, the longest cable run is about 50 meters, I think its a grounding / power issue as i have just connect one of the cameras via a seperate adapter and the picture is allot clearer and even if you move the bnc end of the balun now it does not seem to affect the picture? where can you get a humbug from them please Might to some extent depend on the camera, but to power a camera, over one pair of a cat5, 50 metres is a hell of a long way. I think you'd be better off buying decent baluns, which should isolate anyway, such as NVT rather than adding a humbug, probably a cheaper option as well.
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