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
Buyer Reviews
These are perfectly competent video baluns, and honestly described in the product description.
In spite of this, all purchasers of such items ought to be aware that whilst such cheap passive baluns will produce the desired impedance matching and widespread-mode rejection, they do NOT deliver any sort of isolation at all -- they are wired in an autotransformer configuration.
As a result, they offer ZERO protection for the video ports on your camera/DVR/whatever.
You can see this yourself without gutting 1 by simply employing an ohm-meter to measure the resistance from the balanced line terminals to the BNC terminal -- you will uncover that 1 of the BL terminals is straight connected to 1 of the BNC terminals, and the other has a incredibly low resistance amongst 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, ideal under the subtitle: "Varieties of balun"
If you are operating video more than twisted pair, I sincerely advise utilizing some sort of grounded lightning/surge protection device amongst the BALUN and your much more high priced widgets, like a DVR. The newer, affordable security DVRs do not seem to have considerably in the way of internal protection on them, and a nearby lightning strike or whatnot can quickly produce voltages on the twisted pair that will fry an input port. Cameras seem to be more durable.
Items work as promised. Nonetheless they are cheap. 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 pain if you put the balun into the camera housing and later have to disassemble the camera once more to wiggle the balun. If I had to do more than, I would acquire better high quality baluns. The size is beneficial and the fact that there is not a cable hanging of them is also a plus to me. Nevertheless they do work as lengthy as you dont touch or wiggle them.
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