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Hi I have purchased and installed a Hik-vision DS-7208HGHI-SH/A DVR and 1/3"HD-TVI 2mp 1080p eyeball dome cameras 30m IR. I have used cat 5 cable with baluns, the problem I am having is: When I connect the 4 cameras together using 1 power supply and a 4 lead spider picture quality is rubbish...