Hi guys. I have installed an AHD CCTV system (Hikvision) at my house. I have used solid copper cat5e cable coming from the 4 cameras into a 4 channel balun in the roofspace. Then I have ran a length of cat 5e cable from that down to the DVR. The DVR is connected to the TV via HDMI. The cameras transmit using TVI.
The cams are powered using a single 12v 5a psu and 4 way splitter in the loft.
When I have only one camera connected to the power supply the picture is perfect and very impressive. This is the same for each camera if only one is powered at any one time.
As soon as I power two or more cameras the interference appears. The main problem is the vertical scrolling coloured bars going from right to left and very slight ghosting. Sometimes I notice when i view one particular camera full screen that a ghosting images from another channel rolls across the screen. It is ever so slight. But the main concern is the coloured rolling lines. They keep triggering my motion detection.
I am not sure whether to try individual power supplies or a ground loop isolator on all 4 channels. I want the images as perfect as possible so it doesn't trigger unnecessarily.
The cams are plastic body mounted to pvc facia. The votages are perfect at each cam and wiring all good. 3 pairs used for power and 1 pair for video per cam.
Have any of you come across these annoying lines and how did you solve it.
Finally I am using a 4ch passive balun in the loft so I can send the 4 chanels down one ethernet cable to the dvr. Should there be baluns at the camera and the dvr? Even though there is a 4 ch balun in the loft? Wasnt 100% on that.
Thanks for any input
The cams are powered using a single 12v 5a psu and 4 way splitter in the loft.
When I have only one camera connected to the power supply the picture is perfect and very impressive. This is the same for each camera if only one is powered at any one time.
As soon as I power two or more cameras the interference appears. The main problem is the vertical scrolling coloured bars going from right to left and very slight ghosting. Sometimes I notice when i view one particular camera full screen that a ghosting images from another channel rolls across the screen. It is ever so slight. But the main concern is the coloured rolling lines. They keep triggering my motion detection.
I am not sure whether to try individual power supplies or a ground loop isolator on all 4 channels. I want the images as perfect as possible so it doesn't trigger unnecessarily.
The cams are plastic body mounted to pvc facia. The votages are perfect at each cam and wiring all good. 3 pairs used for power and 1 pair for video per cam.
Have any of you come across these annoying lines and how did you solve it.
Finally I am using a 4ch passive balun in the loft so I can send the 4 chanels down one ethernet cable to the dvr. Should there be baluns at the camera and the dvr? Even though there is a 4 ch balun in the loft? Wasnt 100% on that.
Thanks for any input
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