Document Number:
VH851
Model
VH851 8 Port Active UTP Video Hub;
  Up to 1,500 feet (457 meters) with passive transceivers
Revision Number:
112003

Description:
8 or 16 port active video hubs with dual outputs, built-in surge suppression, ground loop isolation, gain/loss control, and video detection. Systems operate with other Nitek UTP video equipment including, video transceiver hubs, standard video balun transceivers, active transmitters, or any twisted pair equipped camera.

Multi-channel video receiver hubs provide excellent video quality through two video outputs per channel. Twisted pair installations are made with a choice of the standard screw terminal connections, or the modular jack connections featured on the ‘M’ series. The VH851 can receive video up to 1,500 feet (457 meters) when used with passive transmitters. These hubs provide superior immunity from noise and interference, even when run in common raceways with AC power.

Features:

  • Quality video over ordinary twisted pair cable
  • Built-in surge suppression
  • Built-in ground loop isolation
  • Dual BNC connector output
  • Convenient access to DIP switches for accurate gain and loss control
  • High immunity to noise and interference
  • LED’s to indicate video detection
  • Highly compact, only one rack unit in height
  • Video can be run in the same cable with telephone, computer signals and power

8 Port Active UTP Video Hub

Size 1 RU x 6.0"D
Power Requirements 24 VAC @ 450mA
(Wall transformer provided with unit)
Video Input Balanced low voltage current loop
Video Output 1 Vpp composite video
monochrome or color
Common Mode
Rejection
>70dB
Video Format RS170, NTSC, PAL, SECAM,
CCIR (Color or B/W)
Twisted Pair
Connection
Screw terminals providing balanced low voltage current loop
Output Connection Dual BNC Connecotrs
Operating Frequency DC to 10 MHz
Recommended
Transmission Distance
Up to 1,500 feet (457 meters) w/passive baluns
Transient Immunity Built-in
Temperature Range -20 degrees C to +55 degrees C
Humidity Range 0 to 98% non-condensing
Enclosure Type Standard 19" rack 1 RU in height
Shipping Weight 7 lbs
Wire Spec
26 to 12 AWG unshielded
twisted pair (UTP)
DC Loop Resistance
51 Ohms/1,000 feet (max)
(51 Ohms/304 meters)
Normal Capacitance
17pF/ft.
Impedence
100 Ohms +/- 20%
UTP Category
2 or better

Wire and Cable Recommendations

Twisted Sender is recommended for use with unshielded twisted pair (UTP) wiring. The systems will operate over wire gauges from 26 AWG through 12 AWG but are optimized for 24 AWG. Category cabling may be used. Individually shielded pairs should be avoided as they drastically reduce the operating range of the systems. Multi-pair cable with an overall shield is acceptable. Video can be operated in the same communication cable coexistent 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.

For more specific information regarding wire types, gauges and proper installation techniques, please call (800) 528-4343 for technical assistance.

NITEK - VH851 - 8 Port Active UTP Video Hub; Up to 1,500 ft with passive transceivers.

backNITEK - VH1656 - 16 Port Active CCTV UTP Video Hub;  Up to 3,000 ft with passive transceivers
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Product Specifications
Adobe .PDF
Word .DOC
CAD
VH851/ VH1651/ VH856/ VH1656/ VH851M/ VH1651M/ VH856M/ VH1656M Spec  -- VH851 dwg
VH851 A&E Spec  VH851 A&E Spec  VH851 Visio
VH851 Manual -- --
Ordering Information
PART DESCRIPTION
VH851 8 Port Active Receiver Hub w/ surge suppression; up to 1,500 feet (457 meters)
VH1651 16 Port Active Receiver Hub w/ surge suppression; up to 1,500 feet (457 meters)
VH856 8 Port Active UTP Receiver Hub w/ surge suppression; up to 3,000 feet (914 meters)
VH1656 16 Port Active UTP Receiver Hub w/ surge suppression; up to 3,000 feet (914 meters)
VH851M 8 Port Active Receiver Hub w/ surge suppression; up to 1,500 feet (457 meters)
VH1651M 16 Port Active Receiver Hub w/ surge suppression; up to 1,500 feet (457 meters)
VH856M 8 Port Active UTP Receiver Hub w/ surge suppression; up to 3,000 feet (914 meters)
VH1656M 16 Port Active UTP Receiver Hub w/ surge suppression; up to 3,000 feet (914 meters)
VH851 works with the following equipment
VB37M BNC Male Video Balun; up to 750 feet (228 meters)
VB37F BNC Female Video Balun; up to 750 feet (228 meters)
VB39M BNC Male Video Balun w/ surge suppression;
up to 750 feet (228 meters)
VB39F BNC Female Video Balun w/ surge suppression;
up to 750 feet (228 meters)
VB41x4 4 Balun Card w/ surge suppression for Rack;
up to 750 feet (228 meters)
VH439 4 Port UTP Video Balun Mini-Hub w/ surge suppression; up to 750 feet (228 meters)
VH839 8 Port UTP Video Balun Hub w/ surge suppression; up to 750 feet (228 meters)
VH1639 16 Port UTP Video Balun Hub w/ surge suppression; up to 750 feet (228 meters)
TT560 Active Transmitter w/ surge suppression up to 6,000 feet (1,828 meters).
 
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