Nitek VB39F - Manual (Page 3)

Parts of the VB39F
Installation & Setup
Installation Considerations
Wire and Cable Recommendations. The VB39F is designed for use with unshielded twisted
pair (UTP) wiring. Although the system will operate over wire gauges from 18 AWG through 24
AWG, all NITEK UTP system designs are optimized for 24AWG and all adjustment and setting
information assumes use of 24 AWG. Individually shielded pairs should be avoided, as they
drastically reduce the operating range of the systems. Multi-pair cable (25-pair or more) with an
overall shield are acceptable. Video can be operated in the same communication cable coexis-
tent with telephone, computer, control signals, power voltages and other video signals. While
video may be routed through telephone punch-down block terminals, any bridge-taps, also
called T-taps and any resistive, capacitive or inductive devices MUST BE removed from the
pair. Connect an 18 AWG solid Earth Ground wire to the “Ground” terminal on the VB39M for
optimum surge protection.
For more specific information regarding wire types, gauges and proper installation techniques,
please call Tech Support at 800-528-4343.
Video. The VB39F is designed to transmit or receive video at a maximum distance of 750 feet
with a companion NITEK Balun over Category wire of 24 AWG or up to 3,000 feet with an ap-
propriate active NITEK receiver. Before commencing installation be sure that the cable length
does not exceed the recommended lengths. If the length of cable is not known, then a measure-
ment of “Loop Resistance” of the cable can be made using a reliable ohmmeter. Short the pair
together at one end and measure the resistance of the “Loop” across the pair at the opposite
end of the cable. The resistance values shown below are for 750 feet of the most commonly
used UTP cables.