Nitek VH856 User manual

Installation and
Operation Manual
VH856
VH1656
VH856M
VH1656M
NITEK®
Rev 040810
USA Office: Europe Office (Netherlands):
5410 Newport Drive •Rolling Meadows, IL 60008 De Schans 19-21 2a •8231 KA Lelystad
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
Email: [email protected]et Email: [email protected]l
Web: www.nitek.net Web: www.nitek.nl

Reduce risk of fire or electrical shock. Do not
expose this product to rain or moisture.
Installation
UTP Video Receiver Hubs are designed to receive standard UTP
video and output standard coax video.
Step 1)
Check the twisted pair for distance and continuity. Do this by
shorting the pair of wires at one end and use an ohm meter to check
the resistance at the other end. The chart below will give you the length
of your wires for a measured loop resistance. Also, use a multimeter to
test the line to make sure there is no voltage on it. Testing each line
and recording the length of each camera run can greatly reduce
installation time. For distances greater than 3,000 feet (900 meters),
longer range units may be needed.
Step 2)
Connect the twisted pair from each transmitter to the input
terminals noting the polarity of the connection. If the wires are reversed
the video will be unviewable on the monitor. Reversing the wires will not
damage the unit.
Step 3)
The receiver hubs are powered from a 12-24 VAC/VDC power
source. In the case of several units a larger central supply may be
used.
Wire
Gage
500
(150) 1000 (300) 2000 (600) 3000 (900) 4000 (1200) 5000 (1500) 6000 (1500)
22 16 32 64 97 129 161 194
24 26 51 103 154 205 257 308
26 41 82 163 245 326 408 490
Distance in Feet (Meters)

Step 4)
Remove the front panel of the receiver by pulling the knobs
toward you. Inside locate the receiver unit to match the camera you are
working on. Set the DIP switches for your camera distance as listed
below. Use the setting closest to your actual cable length. If you have
no video or a streak through your video your wire pair may be reversed.
When finished replace the front panel and lock it in place by pushing
the knobs in.
After having adjusted each receiver, connect them to the rest of
your video system. Each video channel provides 2 outputs.
The settings listed are for normal conditions. Other settings are
possible. For sharpness adjust switches 7 and 8. For gain adjust 5 and
6. Switches 1 and 2 or 3 and 4 must be operated in pairs according to
distance.
Step 5)
There is also an “Earth Ground” terminal on the rear of the
receiver, this connection provides improved surge protection, it is not
required for operation. If the “Earth Ground” is not connected the unit
will be grounded through the coax shield.
Unmarked positions are OFF Video
Level
Gain
Video
Peaking
Switch Position
1 2 3 4 5 6 7 8
<100-1000
(<30-300)
>1000
(>300) ON ON
>1500
(>450) ON ON ON
>2000
(>600) ON ON ON ON
>2500
(>750) ON ON ON ON ON ON
Distance in
Feet (Meters)
>3000
(>900) ON ON ON ON ON ON ON
Note: Switch settings for use with TT560 active transmitter can be
found in the TT560 manual.

Troubleshooting
Problem Video inverted or rolling and unstable.
Fix/Cause •Reverse the wires of the twister pair at either
the transmitter or receiver.
Problem No video out at the receiver.
Fix/Cause •Check to make sure that there is video in at
the transmit end.
•Make sure that the pair of wires you are using
is not open or shorted between the transmit
and receiver points.
•Check power to the receiver.
Problem Ghost image at the receiver.
Fix/Cause •Bridge tap or “T” tap on the twisted pair video
line. Remove tap.
17.0" (430 mm)
1.75"
(45mm)
6.25" (160mm)
VH1656 TOP & FRONT
PORT 1-4 PORT 5-8 PORT 9-12 PORT 13-16
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568B
214
3
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568B
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7
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5
4
3
2
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Vid 4
Vid 4
Vid 3
Vid 1
Vid 1
Vid 3
Vid 2
Vid 2
VH1656M BACK