generatorlabs

Hi: I am attempting to wire up a multi camera DVR over Cat 6 Cable. If I power a single camera up the image is great. If I connect any 2nd, 3rd or 4th camera they all have noise (bad ghosting that scrolls right or left) All cameras have their own terminals in the power supply but share a common bus in the wall mount supply. With the information I have found here I have purchased and am using the following: 8 Channel DVR 4 Outdoor cameras I have an 8 channel wall mounted power source. I have tried the wall wart transformers that came with the cameras and I get the same result. The cable runs are 200-300 feet. I am using pure copper Cat 6 cable. Each camera has it own dedicated Cat 6 pull. I am using the blue pair for video with baluns on each end. I am using the remaining pairs for power, tying the solid conductors together and the striped conductors together. I have also tried an active UTP transceiver on the DVR end and passive baluns at the camera. Problem still there. The only other thing I could possibly think of is DC-DC isolation converters at each camera. Please help....I am at the end of my rope

Since my problem has been resolved with the NVT baluns on my first 3 channels, I decided to see if I could get some more on Amazon. Wow these things are pricey for a passive device! Can anyone recommend a rock solid balun that will perform like the NV-215A-M, with a better price? And a reliable source? Thanks for the help!

I had a three NVT NV-214-M baluns that I had sitting in my assorted cables drawer and connected them to the system. There is a 100% improvement with these baluns as opposed to using the cheapo ebay units I had. I am using one NVT balun on the camera end and terminating the other end to the Pelco active transceiver. I only had three of these baluns so I am going to have to order another thirteen to complete the project. I have to find a source to get these at a great price. Open to suggestions. Thanks for the help.

OK guys I feel like I am in the middle of some crossfire here and now I stand a little confused. Anyway per request I am putting up the specs to the cameras in question. They are all identical. Power Requirement 12V DC ±10% Power Consumption Max. 350mA (w / IR) Image Sensor: 1/3” 960H CCD Video Format: NTSC Effective Pixels H: 976 V: 494 Resolution 700 TV Lines Scan System 2:1 Interlace Sync System: Internal S / N Ratio: 48dB (AGC Off) Iris: AES AES Shutter Speed: 1/60 ~ 1/120,000 sec. Min. Illumination 0.1 Lux without IR LED 0 Lux with IR LED Video Output: Composite 1.0Vpp @ 75ohm

This is the specs listed for my supply Model: MLT-18CH-NF with cable 18 Port CCTV Camera Power Box 18 Individual PTC Protected Terminals Input AC 110-240V Output: 12V DC, 12A Terminal Connection Max Draw: 20 A Support up to 18 Cameras On/Off Switch Key Protection The cameras are low current Lorex outdoor units with metal housings, but I am using them indoors. I do not believe that each camera will consume more than 275 ma with IR on. I don't have a spec sheet in front of me but I can look up the exact spec tomorrow when I get back to my desk. The baluns are cheapo units I bought on Ebay. After some thought I am thinking that they may not be true isolation type transformers but I dont have enough experience to really be sure. I guess I could try to test that theory with an ohm meter tomorrow. I have some better NVT baluns that I am going to test on two cameras tomorrow. The active transceiver I am using at the DVR is a multi channel Pelco unit. I have taken that unit offline though until I can pinpoint the problem a little better. What do you think? Thanks!

I used Cat 6 because it was a heavier guage, and was solid copper. I was weary of using cheaper Cat5 with copper clad wiring in this application because of the distances involved. But in reality the distances are not long at all. 200 to 300 feet on UTP should would fine. I am not pushing the envelope or at least that is what I thought. The DC pairs are connected to a quick barrel adapter on the camera end and are connected to screw terminals inside the power supply on the other end, near the DVR. 3 Solid color conductors for NEG and 3 striped color conductors for POS. Initially i thought the wall mount power supply was the culprit but the exact same thing happened with another supply. The cameras came with a wall wart power supply with a four way splitter however I thought the voltage drop across the cable would be a little much for a tiny wallwart supply. The wall wart power supply seems to power the cameras just fine but even it produces noise if more than one camera is connected. The large power supply is adjustable, so I thought I would just raise the voltage one or two volts to compensate for voltage drop. Made no difference. So I set it back to 12.2 VDC. It was getting kind of late so I walked away from it. I will give it another go tomorrow. After some reflection I think I will try a high quality NVT balun on two of these cameras and try it out then. Maybe the cheap baluns I bought on EBay are the culprit. I am still open to any suggestions though. You folks may have seen something I havent observed. Thanks!

I have a 32 channel Pelco active hub and I would like to utilize it with a 16 Channel Lorex system. The model of the active hub is PELCO CM9700UTP32US-S. I want to run the cameras over longer distances (300-500ft) using existing Cat6 cable. I was hoping to use the active hub next to the DVR and 16 passive baluns at the cameras. The cameras are described as 700TVL Resolution using an advanced new 960H Image Sensor. My question is this: Is there anything particularly unusual about what I am attempting? Will the Pelco unit accept the signal with no problem? Is there anything proprietary about the Lorex cameras that would prevent this. The cameras have typical BNC connectors and barrel power connectors. The reason I ask this is because I get the impression that the newer higher res analog cameras need special active baluns. Is this true? I will be using a 16 channel power supply to power the cameras over the Cat6 as well. Thanks Daniel