BangersAndMash

Hi, just joined and wondered if you could tell me which forum would be most suitable for discussing this problem I have? Thanks.

Hi, OK. Well, I have a single camera fed into a 4 channel DVR. The camera attached to the DVR by a 20m signal/power cable with BNC connectors. One of these: http://www.amazon.co.uk/gp/product/B004I9N5RO/ref=s9_simh_gw_p60_d4_g23_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=0T9AHTQVW5KY3927S49R&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294 this is the DVR: http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=230697982868&ssPageName=ADME:L:OU:GB:1123 The picture is heavy with interference, so much so I think it actually trips the motion detector alarm in the DVR. The interference looks like faint vertical lines being badly distorted left and right, like a hairpin in a road. I have tried to plug the camera and DVR into separate power outlets and then on the same outlet and I've checked all the connectors, but no luck. I have also tried a ground loop isolator but that made the problem ten times worse. Is it because the signal/power cable is unshielded? I've read that power and signal cable should not run along side each other and 20m is a long way to run both power and signal side by side. Any ideas?