Price : $21.39
Product Description
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
Consumer Critiques
These are perfectly competent video baluns, and honestly described in the item description.
Nevertheless, all purchasers of such items must be aware that although such affordable passive baluns will supply the desired impedance matching and common-mode rejection, they do NOT deliver any sort of isolation at all -- they are wired in an autotransformer configuration.
As a result, they give ZERO protection for the video ports on your camera/DVR/whatever.
You can see this your self without having gutting a single by merely utilizing an ohm-meter to measure the resistance from the balanced line terminals to the BNC terminal -- you will discover that 1 of the BL terminals is directly connected to a single of the BNC terminals, and the other has a fairly low resistance among it and the other BNC terminal.
Or you can go to the Wikipedia write-up for BALUN and see a schematic of a typical balun, proper beneath the subtitle: "Sorts of balun"
If you are running video more than twisted pair, I sincerely suggest making use of some sort of grounded lightning/surge protection device between the BALUN and your a great deal more expensive widgets, like a DVR. The newer, affordable security DVRs do not appear to have considerably 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 appear to be a lot more durable.
Items work as promised. Having said that they are cost-effective. The spring on the locking ring is weak and the fitting is loose. If you wiggle or bump them the video goes OUT or becomes noisy. This is a discomfort if you put the balun into the camera housing and later have to disassemble the camera again to wiggle the balun. If I had to do over, I would get greater good quality baluns. The size is great and the truth that there isn't a cable hanging of them is also a plus to me. Even so they do perform as long as you dont touch or wiggle them.
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