|1CH CCTV Passive HD-AHD/CVI/TVI Video Balun(VB202PH)|
|Video Format||HD-CVI/TVI/AHD, NTSC, PAL, and SECAM|
|Frequency Response||DC to 60MHz|
|Impedance||Coax, Male BNC||75 ohms|
|Terminal Block||100 ohms|
|Working environment||Working Temperature||-10ºC to +50ºC|
|Storage Temperature||-30ºC to +70ºC|
|Humidity||0 to 95%|
|UTP Connection||Screw Terminal blocks|
|Power||No power required|
What does a CCTV balun do?
A video balun is a device used to adapt the type of connection to
allow the use of UTP (Unshielded Twisted Pair) cable to transmit
the signals from an analog camera. ... A pair of wires are used to
connect the UTP cable to the balun and a BNC connector is used on
the coaxial cable to connect to the other end of the balun
By using a video balun it is possible to replace the traditional
coaxial cable such as RG59 or RG11 and CAT5 cables to transmit the
video over long distances.
The pictures shows the types of cables used with a balun for CCTV.
A pair of wires are used to connect the UTP cable to the balun and
a BNC connector is used on the coaxial cable to connect to the
other end of the balun.
The balun word originated from the terms balanced/ unbalanced
because it can convert an unbalanced signal to balanced.
With balanced signals, it is possible to transmit the signal
further away because it is less susceptible to external
Baluns are popular because most of the regular ones are cheap and
can use Cat5e and Cat6 UTP cables to increase the camera`s
Of course, there are different types of baluns for CCTV that vary
in quality and price, so it is important to be aware that
low-quality baluns can compromise the entire surveillance project
with images that are not good enough.
What are types of baluns for CCTV?
The baluns that do not require power to qork and don`t boost the
signals are called passive and are used just to convert the signals
to run on the cat5e or cat6 cables. The following picture are shows
some passive baluns used on a CCTV installation.
As you can see, there`s one pair of passive balun per camera.
The baluns always work in pairs, one is connected to the analog
camera and the other one is connected to the DVR do convert the
signal back to unbalanced.
With passive balun, it is possible to run cables for around 200-
300m depending on the type of analog signal and the quality of the
cable and balun that is used.
Active baluns use power to boost the signal and improve the
distance the Cat5e cable runs by helping to minimized the external
Depending on the type of active baluns and cable that are used on
the installation it is possible to install the cameras aroud 1200m
away from the recorder.
As you can see, the active baluns(as know as transceivers) are
installed on each side of the cable and are powered to boost the
analog signals from the cameras.
Before choosing a balun for CCTV make sure it meets the
requirements for the distance you need to install the cameras.
Video Power Balun
It is possible to send video and power to the camera using the same
Cat5e cable by using a video power balun thus reducing the costs of
running extra cables.
Such type of a balun requires that an RJ-45 connector is crimped to
each end of the car5e cables as shown in the following picture.
Video Power, and Data Balun
When an analog PTZ(Pan Tilt Zoom) camera is used in the
surveillance project, it is necessary to run video, power and data
ober cat5e cables that is the reason a video power and data balun
By using such a device the camera can be powered, transmit the
video signals and also receive a command from a DVR(Digital Video
Recorder) or an analog joystick.
What is the difference between active and passive video balun?
The passive balun is non-powered and just converts the unbalanced
to balanced signals so it is possible to transmit the camera analog
signals over the CAT5E cable.
Active balun is powered and can convert and boost the unbalanced
signal to balanced signals and transmit it to long distances over
the Cat5e cable.