mattlp1980

Hi all new to this forum & quite new to cctv setup, I am using 1 old Dvr unit & a sunluxy dvr system with up to 5 cameras & only use the setup in dark locations. Both units have perfect picture without the camera Ir's on but as soon as all lights go out Ir's come on & all the pictures flicker as if the power drain is causing picture loss, although when we watch back recordings are clear but I need the view live option. The Camera Psu is 12v 4a running 4 cameras, any additional cams are on separate psu, each camera has at least 20m of bnc/power extension cable (but this is only cheap extensions) Any input would be great. Thanks in advance. Matt