|Item Weight||4.8 ounces|
|Product Dimensions||7.1 x 3.9 x 0.4 inches|
|Assembled Height||0.39 inches|
|Assembled Length||7.09 inches|
|Assembled Width||3.94 inches|
|Item Package Quantity||1|
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Armorview 6 PAIRS (12 Pcs) Mini CCTV BNC Video Balun
- 6 PAIRS (12 pcs.) Mini CCTV BNC Video Balun
- Easy installation, using the standard UTP cable system
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Features: *Easy installation, using the standard UTP cable system *Male BNC allows connection directly to the camera or DVR *Support all video devices, such as camera, monitor, DVR card and recorder etc. *Lower budget, the price of CAT 5 cable is much less than coaxial cable *Using UTP cable (CAT 5, RJ45) to transmit video, audio signal instead of coaxial *Utilize existing wiring. Already have structured cabling systems? Simply connect a balun at each end of the cable run to transmit your signal. *Reduce installation cost. UTP cables physically smaller than coax alternatives, more cameras through a smaller diameter, extremely easy to install and terminate. *Better EMI and RFI interference rejection than coaxial cable *Lower cable cost. The cost of video balun plus Cat 5 cable may less than traditional wire. Especially for high cost Plenum Coax cables
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However, all purchasers of such items should be aware that while such inexpensive passive baluns will provide the desired impedance matching and common-mode rejection, they do NOT provide any sort of isolation at all -- they are wired in an autotransformer configuration.
As a result, they provide ZERO protection for the video ports on your camera/DVR/whatever.
You can see this yourself without gutting one by simply using an ohm-meter to measure the resistance from the balanced line terminals to the BNC terminal -- you will discover that one of the BL terminals is directly connected to one of the BNC terminals, and the other has a very low resistance between it and the other BNC terminal.
Or you can go to the Wikipedia article for BALUN and see a schematic of a typical balun, right under the subtitle: "Types of balun"
If you are running video over twisted pair, I sincerely recommend using some sort of grounded lightning/surge protection device between the BALUN and your more expensive widgets, like a DVR. The newer, inexpensive security DVRs do not seem to have much in the way of internal protection on them, and a nearby lightning strike or whatnot can easily generate voltages on the twisted pair that will fry an input port. Cameras seem to be more durable.
I bought these to make jumpers from a sequencer (Multiplexer) to a DVR instead of paying as much as the same (each) for 3-ish foot coax jumpers as the box price of this set so my logic is if I get two or three pair to work I've come out ahead and the rest are bennies.
As others have mentioned you need some end-point protection on passives and you will lose some gain. Impedance is out the window.
You're paying around $2 a pair here, about the price for one BNC connector. Hook everything up and get it working then upgrade to better ones if needed.
I had major ground looping issues due to using one 5A 12V power supply for all 8 cameras. Switched to 8 individual 1A power adapters and my ground loop issue went away.
Would definitely recommend these if you want to save some money on your cabling costs and use CAT5 instead of RG59/RG6.