Some of my cams on new install are flickering?

[BazzoBastin 0]

Hi guys..

 

Dug out my old 16ch DVR (4-5 years old).. I'm sure the dvr is working perfectly as ive swapped cams around..

 

I have installed a mix of old cams (13 so far).. and several of them have constant picture flicker/roll and was wondering what you guys think the cause could be,

The system is wired in CAT5, 2 cams per cable run with baluns at each end. All cams are powered by a central PSU.

 

I'm leaning towards the cameras as they were not very expensive 4 years ago.. typically they are 36 LED CCD cams.

 

I had it in my head that this problem can be caused if cams are on individual power supplies, but that's not the case here.

 

Any suggestions? Is there a set pair in the cat 5 that should be used for video, although again all are wired the same, some are fine and some aren't.. I'm leaning towards just buying a complete set of new cams as its annoying that the quality is variable across all the cams and I'm a little anal.. would prefer them all the same especially as ive placed them in such a way as to cover the perimeter of the property in one continuous image.. if you know what I mean..

 

Sorry if I'm missing any info.. and thanks for advise in advance

[tomcctv 187]

Hi. You will need to give a little more info

 

What type of balun .... Can you post a pic

 

How far are your cable runs

 

Size of power supply used and how are you powering the cameras with it

[BazzoBastin 0]

cable runs.. longest is maybe 50m, most are about 30m

 

pic of balun attached

 

cams are powered using a pair in the cat5

 

psu is a proper cctv psu, 20amp I believe....designed for 16 cams pic attached

[almelst 1]

1. Check power supply voltage on camera side, 50 m looks too long for 2 cameras on cat5 if you used it for power supply too.

2. Are cameras mounted on metal grounded surface? If so, isolate them from surface.