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leachim

Testing CCTV Analogue Cable

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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

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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

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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

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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. 

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