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Join Date: Oct 2009
Location: Lyme, Connecticut
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Security Camera Interference

10/17/2009 9:11 AM

I have a security video camera located at the beginning of my driveway. The signal is sent via 500 feet of Cat 5e cable underground to the house where it connects to a distribution amplifier and then to monitors via RG59 cable. I am getting interference which causes a black bar and a white bar to continuously roll up the monitor screen and distort the picture. The interference appears to come and go randomly and sometimes will result from turning on fluorescent lights or the microwave oven.

The baluns I am using are XAVEE-1000 from CCTVGadgets.com.

Has anyone experienced this problem and if so what can be done to resolve it?

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#1

Re: Security Camera Interference

10/17/2009 11:55 AM

Try a signal amp or a good video filter.

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#2

Re: Security Camera Interference

10/18/2009 12:43 AM

Those two items are a problem with interference though I am surprised at fluorescent lights. Try checking your ground plus 500' is a lot of cable. Check the signal before and after the dist. amp. with a scope if you have one.

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#4
In reply to #2

Re: Security Camera Interference

10/18/2009 3:43 PM

maveric manic

I eliminated the distribution amp and went direct to a single monitor but it did not eliminate the interference.

Also, according to the specs for most baluns, 1000 feet for color transmission and 2000 feet for black & white over Cat 5e UTP is not exessive.

In researching various baluns, I have just learned that there are baluns available for isolating groud loops which supposedly eliminate rolling hum bars and picture instability which apparently are comon problems. I guess I'll try some provided they are not too expensive.

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#5
In reply to #4

Re: Security Camera Interference

10/19/2009 2:38 AM

VGA/DVI display devices over long runs of CAT-5/CAT-6 cable. Runs over 400 feet may lose quality due to attenuation and variations in the arrival time of each signal. A skew control and special low skew or skew free cable is used for runs over 400 feet.

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#3

Re: Security Camera Interference

10/18/2009 12:13 PM

500' is to long, place a repeater every 300'

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#6
In reply to #3

Re: Security Camera Interference

10/19/2009 8:45 PM

I believe I have found the solution.

I'm not having any problem with picture color or detail, only a rolling hum bar which according to on line info is caused by ground loop potential difference between the camera and the monitor. This supposedly can be eliminated by use of a ground loop isolator. http://www.eql.com.au/videogli.htm

In the event that a ground loop isolator does not solve my problem, what brand/model repeater do you recommend?

As far as distance using Cat 5e cable, the following sites all claim over 1000 ft:

http://www.cablestogo.com/product.asp?cat_id=3115&sku=41151

http://www.seco-larm.com/EVPPT11.htm

http://www.svideo.com/cctvbalun.html

http://www.dalco.com/ProductDetails2.aspx?sku=71772&OVRAW=cctv%20balun&OVKEY=500022&OVMTC=advanced&OVADID=2148872022&OVKWID=20367872522

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#7
In reply to #6

Re: Security Camera Interference

10/20/2009 1:43 AM

The potential to correct depends upon at which end the ground is lifted, ask about that when you buy.

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