leachim 0 Posted March 5, 2023 I have a long stretch of monitor cable - probably 140 metres (2 sections - centre signal with earth braid - and also 12v positive and negative) No signal is getting through to the monitor It used to work Cable has been up 10+ years Have tried various modalities like cleaning contacts Latterly have disconnected both ends of the video cable - then joined the earth braid and live together at one end Went to the other end and used an ohms meter to check the reading over approx 280m (2x140m) - by one probe on the signal centre and another probe on the earth braid- it was 15 ohms Now, is that what you would expect over that run of cable ? Thanks Share this post Link to post Share on other sites
tomcctv 190 Posted March 5, 2023 Hi 920ft is a big distance to run monitor over without a signal booster what connection is at monitor end and dvr end also why having 12v ? Over that distance you will be lucky to have 6v Share this post Link to post Share on other sites
leachim 0 Posted March 5, 2023 17 minutes ago, tomcctv said: Hi 920ft is a big distance to run monitor over without a signal booster what connection is at monitor end and dvr end also why having 12v ? Over that distance you will be lucky to have 6v Thanks The run is about 460ft It worked ok before It isn't 920ft - I joined the earth braid and the centre copper wires together at one end - so that when I go to the OTHER end and put a probe on the copper and the other probe on the earth braid - the signal has to travel 960ft (2x460ft) to get back to the other probe - this is 15ohms Just to see if there is a break in the cable Is 15ohms ok ? I can measure 12v ok at the camera end Share this post Link to post Share on other sites
tomcctv 190 Posted March 5, 2023 Ok so what is the 12v for 150m is still too long what amp is drawn and what connectors are you using BNC to scart or RCA Share this post Link to post Share on other sites
leachim 0 Posted March 28, 2023 On 3/5/2023 at 11:24 PM, tomcctv said: Ok so what is the 12v for 150m is still too long what amp is drawn and what connectors are you using BNC to scart or RCA Oops Just seen this reply.... 12v is to power the camera BNC connection for video. Has worked ok for a few years. It takes the signal back to a cctv recorder - Hikvision Am wondering if the analogue cable is breaking down. Share this post Link to post Share on other sites
