Distortion on 2 cameras but good on others

[stayfix 0]

hi, i'm wondering if someone can help. i been stuck for a while on a problem.

 

i've replaced the cctv cameras at home with HD cameras. total 4 cameras. 2 at the back and 2 at the front. the front ones work perfect. but the back is VERY distorted. [ http://i.imgur.com/5fr2x46.jpg, http://i.imgur.com/afGzx6e.jpg ]

 

the front are 3 meters from PSU and DVR. and the back ones are 15-18 mtrs away [running cable length]. cable used is an RG-59. power supply is a 12V 3 amp.

 

old ones worked fine at the back, but new ones do not. old ones were the cheap basic type cameras. i've checked all connections. i've reset DVR, i've re-crimped the connectors on the cables.

 

i do not think its the camera, and the cable. as the cameras were tested before they came to me, and the cable is fine as the old camera's worked fine. i've taken all the other cameras of PSU and just put the one back one, still no difference. this is the PSU: http://i.imgur.com/KETNwaV.jpg

 

there are no other cables running along the CCTV cables.

 

camera spec:

http://www.everfocusonline.co.uk/HD-SDI-CCTV/Cameras/HDCCTV-Bullet-Camera

 

any help is much appreciated.

[VST_Man 1]

did you take the protective film off the outside on the lense?

[shockwave199 0]

People HAVE to learn how to take a digital snapshot in their systems and stop posting a picture of the monitor. Not only doesn't it help to diagnose a problem, but authorities wouldn't accept that kind of picture either. Gotta learn. Please post a proper snapshot.

[Kawboy12R 0]

What happens when you put a camera that has a good image in place of one that has a bad image (physically swap them)? Does the "good" camera suddenly have a bad image? How about swapping cables at the DVR? Does the bad image swap with the cable or does it stay with the same input on the DVR?

[stayfix 0]

What happens when you put a camera that has a good image in place of one that has a bad image (physically swap them)? Does the "good" camera suddenly have a bad image? How about swapping cables at the DVR? Does the bad image swap with the cable or does it stay with the same input on the DVR?

 

i've swapped the camera's around and i still had bad image. i've tried both cables. still same situation.

 

could it be a power supply issue? as its only a 3Amp. and because the cable is long, the camera isn't getting enough power. camera's are 5 amp

[Kawboy12R 0]

Cameras are 5W, not 5A. A 3A power supply is more than enough juice over adequate cabling to run those cameras. That doesn't mean that it ISN'T a power supply issue, just that a properly working power supply of that spec should power your cameras. Cheap cables with thin power wires might cause enough voltage drop over the longer distance to cause problems with even a good PS though. And just having adequate power doesn't mean the PS isn't going bad either.

 

Also, you can get tweakable power supplies to adjust the supplied voltage so that you get adequate voltage (not amperage, voltage) over a longer run that causes voltage to drop at the camera under load. This is usually noticeable at night- IRs kick in, take more power, then the camera gives problems but starts working fine in the morning. It can happen in the day as well though if the voltage drop is particularly pronounced. Voltage drop at the camera is probably best tested with a short run of 18/2 wire with a male and female barrel connector at both ends. Skin the two wires in different places so they don't touch each other but you can get a multimeter on them. Then put your home-made test leads on the power wire at the camera end and test voltage with the camera running.

 

I'm not terribly familiar with HD-SDI but I know that they can be picky about the cabling that they work on. An analog cam can work just fine, replace it with an HD-SDI and it'll work like crap, replace the cable and then both work fine. Not a power issue but rather a coax issue. I'd try another premium grade cable. Just run it from the DVR to the cam to verify before replacing the old one.