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bentech

Grounding / power problem on CAMS ?

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Hi ,

 

I have 8 analog Cams connected to 12 VDC (power dist panel) and using RG59 (~600 feet with a union/junction).

 

Image is poor , lines at the bottom of the screen , etc...

 

What can be the cause of this ?

 

-Should I use 24VAC ?

-Ground problem ?

-Need to boost signal ?

-Termination at DVR ?

 

Please help ... I have access to an oscilloscope.

 

Thanks.

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Have you tried to view the cameras on a different monitor.

 

First thing i would do is check the terminations on both ends of the lines.

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Just to give you more info ,

 

I have 32 cams connected to the DVR. I have problems only with 6-7 cams that are in an other building.

 

Can it be a parasite signal that goes on the 12VDC line ?

 

My next step was to connect a signal generator at the place of one cam and see the output at the DVR side with a oscilloscope.

 

I don't know if I connect them with 24VAC it it will be better.

 

Is a Loop Isolation Transformer - GIT100 would help ?

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Have you tried plugging the cameras in individually ? Try plugging them in one by one as it may be just the one camera pulling the others down .

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Hi. Can you give more info on how you have connected ....... Is power local to your 8 cameras ?

 

Also just for a quick test do you have option on cameras to go black and white

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The 8 cams on that building have a 12VDC power distribution alone just for them.

 

I changed it and samething.

 

Now way for black and white

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Good to know. You mean that Grounding is as much important as Voltage supplier, as we experience sewage with our toilet. Clean flushing means clean video.

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