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balum and twisted pair
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| oneeye |
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Posts: 8
Joined: 22 Nov 2008
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Posted: Sun Dec 07, 2008 6:33 am
Post subject: balum and twisted pair
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I have a customer with two fixed outdoor cameras,both cameras are sharing one cat 5 for video and one cat 5 for power. Both cables are less than 100Ft. both cameras are rolling before I replace the cable what troubling steps can I run to narrow my trouble down?
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| VST_Man |
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Posts: 1497
Joined: 16 Oct 2004
Location: Sandpoint, Idaho
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Posted: Sun Dec 07, 2008 11:22 pm
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on the dvr end......use the 2 baluns on a test cable to check that they work.........then use thos eto install on one camera run........
is the cable indoors? is it run near any AC voltage wires?
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"you get what you pay for"
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| oneeye |
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Posts: 8
Joined: 22 Nov 2008
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Posted: Mon Dec 08, 2008 6:14 am
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I will check the cable for twist are a possible EI.And try your first test.
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| Soundy |
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Posts: 898
Joined: 23 Feb 2006
Location: The Burbs of Vancouver
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Posted: Mon Dec 08, 2008 1:18 pm
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Are they 12VDC or 24VAC? Do they both run off the same power supply?
I've seen ground loops cause weird problems with 12VDC cameras using a common power supply.
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LPS Loss Prevention Systems - Maple Ridge, BC
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| oneeye |
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Posts: 8
Joined: 22 Nov 2008
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Posted: Mon Dec 08, 2008 9:58 pm
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They are 12v are two cameras are on one power supply and the two that are rolling on another.
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| Soundy |
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Posts: 898
Joined: 23 Feb 2006
Location: The Burbs of Vancouver
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Posted: Tue Dec 09, 2008 12:56 am
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Try putting the two rolling ones each on its own power supply.
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LPS Loss Prevention Systems - Maple Ridge, BC
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(='.'=)This is Bunny. Copy and paste bunny into your
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| oneeye |
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Posts: 8
Joined: 22 Nov 2008
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Posted: Tue Dec 09, 2008 5:29 am
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Thanks for help if will give it a try today will post outcome.
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| coolie11 |
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Posts: 229
Joined: 05 Oct 2007
Location: New York
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Posted: Tue Dec 09, 2008 9:27 am
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Try powering the DVR and the cameras from the same AC outlet.
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| Soundy |
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Posts: 898
Joined: 23 Feb 2006
Location: The Burbs of Vancouver
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Posted: Tue Dec 09, 2008 9:44 am
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| coolie11 wrote: |
| Try powering the DVR and the cameras from the same AC outlet. |
In theory, that shouldn't matter, as the power tranformers isolate the cameras from the DVR power ground. unless, of course, the camera chasis is attached to an earth ground...
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LPS Loss Prevention Systems - Maple Ridge, BC
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(='.'=)This is Bunny. Copy and paste bunny into your
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| coolie11 |
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Posts: 229
Joined: 05 Oct 2007
Location: New York
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Posted: Tue Dec 09, 2008 9:58 am
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| Soundy wrote: |
| coolie11 wrote: |
| Try powering the DVR and the cameras from the same AC outlet. |
In theory, that shouldn't matter, as the power tranformers isolate the cameras from the DVR power ground. unless, of course, the camera chasis is attached to an earth ground... |
I think Its worth a try.
I've had situations were cameras was powered locally using Isolated Transformers and still had image distortion and looping.
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