Video baluns allow standard network cable (Cat-5e
/ Cat-6) to be used to transmit security
camera signals as an alternative to RG-59 coax or pre-made coax cables. Baluns must be used in pairs
and require no power if they are of the "passive" type. When used with network
cable (also referred to as UTP-unshielded twisted pair), the balun balances the camera signal and changes the
impedance to 100 ohms for transmission. At the receiving end, another balun is used to convert
back to a 75ohm, unbalanced signal which can be properly processed by the DVR or monitor. Cat5e has
a couple advantages over coax cable in that it is lighter, smaller diameter (and drilled holes), less expensive, and
can transmit video farther (depending on conditions, around 900'). However, it has some disadvantages
too. The range for transmitting power
over Cat-5e is shorter than the 18awg wire found in RG-59 siamese cable.
This is because at 24awg, Cat-5e wire is a lot thinner that of RG-59 siamese. Also, Cat-5e has less pull strength
and therefore, more care must be taken during installation not to strain the conductors.
But wait, the video balun / Cat-5e combo has one more benefit that will appeal to the DIY folks--most baluns are
easy to install. For two of our models, the only special tool you really need is a good pair of wire strippers.
The stripped wires are tightened down on the baluns using a screw driver. The balun itself attaches easily by
hand to the back of the DVR or camera BNC connector. On the other hand, fastening BNC connectors to RG-59 requires
special tools to strip the coax and then attach a compression or crimp type BNC connector. Once you have the tools
(they are not cheap), it takes practice to do it right and the connections should be tested with an ohm meter.
It is not recommended using the "twist on" type of BNC connectors with RG-59. "Twist on" also means "Twist off".
They're not reliable and not worth the headache even if they fail just once.
Connect to Just One Twisted Pair Within Cat-5/6 Cable
Passive: Requires No Power
BNC Connectors Support Almost All CCTV Cameras & DVRs
Easy to Install & Use With Screw Terminal Block
Long Range Video Transmission, 900+ feet
Narrow Model Has Same Width as BNC connector
One Cat-5e Cable Can Support Multiple Baluns/Cameras