Nitek VB39F - Manual (Page 4)

Installation & Setup
Unshielded Twisted Pair
(Loop Resistance at 750 feet)
AWG 18 20 22 24
Loop Resistance 10 Ohms 15 Ohms 24 Ohms 39 Ohms
Mounting
The VB39F can be mounted external to a camera housing by use of the mounting leg, or can be
placed inside the camera housing.
When mounting the VB39F externally, the placement should be sufficiently close to the camera
housing so that the coax cable from the camera can be conveniently connected to the VB39F.
The mounting leg of the VB39F can be used to secure the device either with a screw or wire
wrap. The wires of the UTP cable must be stripped, as required and wrapped around and con-
nected to the appropriate
+
and
-
Screw terminals on the back of the VB39F. Be sure to main-
tain the same UTP polarity at both the transmit and receive units.
When mounting the VB39F inside a camera housing a small hole must be available to pass the
UTP cable through. The cable must be of sufficient length to be routed back to the video cross-
over. As with external mounting, the coax video cable will connect within the housing to the
camera video BNC input.
In either mounting, connect an 18 AWG solid wire from Earth Ground to the “Ground” terminal
on the VB39F for optimum surge protection.
Hook-Up
In the diagram shown above, two VB39F devices are used; one at the Head-End (monitor loca-
tion) and the second at the camera location. No voltage is required for the baluns, since they are
passive devices. Video is sent back to the monitor over the UTP cable by means of the two
baluns operating as video transceivers. Note the Earth Ground connections for the surge protec-
tion circuits.