Nitek : VH856
Description
The Nitek 8 or 16 port active video hubs VH856 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 VH856 can be used on video runs up to 3,000 feet (900 meters) when used with passive transmitters, or distances of up to 6,000 feet (1,800 meters) with the Nitek TT560 active transmitter. These hubs provide superior immunity from noise and interference, even when run in common raceways with AC power.
Available Configurations Include:
| VH856M | UTP Video Receiver Hub (RJ45 Jacks) – 8 Ports – Selectable 100 feet to 6,000 feet |
Features
VH856 features include:
- Quality video over ordinary twisted pair cable
- Built-in surge suppression
- Built-in ground loop isolation
- Dual BNC connector output
- RJ45 jack connector input
- Convenient access to DIP switches for accurate gain and loss control
- High immunity to noise and interference
- LEDs 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
Specifications
| 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 Connectors |
| Wire Size | 26 to 12 AWG Unshielded Twisted Pair |
| Operating Frequency | DC to 10 MHz |
| Recommended Transmission Distance | Up to 3,000 feet (900 meters) w/passive baluns Up to 6,000 feet (1,800 meters) w/active transmitters |
| 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 | 8 lbs |
| Wire Spec | 26 to 12 AWG Unshielded Twisted Pair (UTP) |
| DC Loop Resistance | 51 Ohms/1,000 feet (max) (51 Ohms/300 meters) |
| Normal Capacitance | : 17pF/ft. |
| Impedance | 100 Ohms /- 20% |
| UTP Category | 2 or better |
Resources & Documents
| vh856_spec.pdf | Datasheet |