Hi, I have installed a simple 4 camera CCTV kit, (4 x 12V IR cameras + a DVR), and am having a problem with interference (lines running through the screens and even a faint image of another camera over the top of another cams image.
This only happens when the cameras are powered by the same transformer (12V 3A), when they are powered by 4 separate transformers they work fine, but then put 2 or more on one and the problem happens.
I have tried a different main transformer, that does no good.
The only alteration I made to the kit was to use CAT5 and balums instead of the BNC/Power cables that come with the kit (for ease of threading through holes, ect), but I can't see as this is the problem as the picture quality is fine if separate transformers are used.
If anyone has any ideas why this is happening I would be most grateful for ideas!
I am thinking it's maybe a earth loop problem and I'm currently researching way of overcoming this but thought I'd ask here for any personal experience.
Thanks!
This only happens when the cameras are powered by the same transformer (12V 3A), when they are powered by 4 separate transformers they work fine, but then put 2 or more on one and the problem happens.
I have tried a different main transformer, that does no good.
The only alteration I made to the kit was to use CAT5 and balums instead of the BNC/Power cables that come with the kit (for ease of threading through holes, ect), but I can't see as this is the problem as the picture quality is fine if separate transformers are used.
If anyone has any ideas why this is happening I would be most grateful for ideas!
I am thinking it's maybe a earth loop problem and I'm currently researching way of overcoming this but thought I'd ask here for any personal experience.
Thanks!