Ultrak VZ-20-T User manual

VZ-20-T
VIDEO
TWISTED-PAIR
TRANSMITTER
Operating
instructions
Ultrak Italia
Via Treviso, 2/4 l31020 San Vendemiano (Treviso)
Italy
(39) 0438/3651 lFAX (39) 0438/370471

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ISSUE 1 -September 1997
AUSGABE 1 -_________ 1997
RÉVISION 1 -________ 1997
EDIZIONE 1 -_________ 1997
1997 BY ULTRAK
ALL RIGHTS RESERVED
PRINTED IN KOREA
ALLE RECHTE VORBEHALTEN TOUS DROITS RESERVES TUTTI I DIRITTI RISERVATI
GEDRUCKT IN KOREA IMPRIME IN COREE STAMPATO IN COREA
ULTRAK
1220 CHAMPION CIRCLE, #100
CARROLLTON, TEXAS 75006
[phone]
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY BE REPRODUCED BY ANY MEANS
WITHOUT WRITTEN PERMISSION FROM ULTRAK.
THE INFORMATION IN THIS PUBLICATION IS BELIEVED TO BE ACCURATE IN ALL RESPECTS.
HOWEVER, ULTRAK CANNOT ASSUME RESPONSIBILITY FOR ANY CONSEQUENCES RESULTING
FROM THE USE THEREOF. THE INFORMATION CONTAINED HEREIN IS SUBJECT TO CHANGE
WITHOUT NOTICE. REVISIONS OR NEW EDITIONS TO THIS PUBLICATION MAY BE ISSUED TO
INCORPORATE SUCH CHANGES.
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ULTRAK VERÖFFENTLICHT, VERVIELFÄLTIGT ODER AN DRITTE WEITERGEGEBEN WERDEN.
DIE INFORMATION IN DIESER VERÖFFENTLICHUNG WURDE NACH BESTERN WISSEN UND GEWISSEN ERSTELLT. ULTRAK
LEHNT JEDWEDE REGRESSANFORDERUNGEN FÜR EVENTUELLE ENSTEHENDE FOLGEN AUS DER NUTZUNG DIESER
INFORMATION AB. ÄNDERUNGEN VORBEHALTEN. NEUE ODER ÜBERARBEITETE AUSGABEN KÖNNEN SOLCHE ÄNDERUNGEN
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PREAVIS. DES REVISIONS OU NOUVELLES EDITIONS DE CETTE PUBLICATION PEUVENT ETRE FAITES POUR INCORPORER
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TUTTI I DIRITTI RISERVATI. NESSUNA PARTE DI QUESTA PUBBLICAZIONE PUO’ ESSERE RIPRODOTTA PER NESSUNO SCOPO
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CONTENTS
Preface.................................................................................................................................................4
Features...............................................................................................................................................4
Block diagram.......................................................................................................................................4
Principle of operation............................................................................................................................4
Controls and connectors.......................................................................................................................5
Connections..........................................................................................................................................6
Installation............................................................................................................................................6
Appearance ..........................................................................................................................................7
Specifications.......................................................................................................................................7
This unit is produced to comply with Directive
89/336/EEC.

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PREFACE
The video twisted-pair transmitter VZ-20-T is a
correction amplifier with the standard
asymmetrical video input and a symmetrical
output which is adjusted to connect the twisted-
pair cable. It has small dimensions and ABS
casing. There is a small metal saucer inside of
the casing and the transmitter can be easily
installed into the casing of a video camera for the
outdoor use. The choice of output impedance
allows the use of different kinds of cables.
FEATURES
•small dimensions
•simple connecting
•AC/DC power supply
•low power consumption
•over-voltage protection
•dual output impedance
•pre-emphasis +10 dB / 5 MHz
BLOCK DIAGRAM
PRINCIPLE OF OPERATION
The input is closed with the impedance of 75 Ω.
The clamping is set with the trimmer TP1. Then
follows the stage which defines the pre-emphasis.
By means of the symmetry stage two signals
separated by 180°appear, which are led to the
output stages A and B.
The output impedance jumper enables a choice of
output impedance -125 Ωor 90 Ω.
The power is supplied by connecting to the AC or
DC power supply unit.

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CONTROLS AND CONNECTORS
(1)AC/DC POWER SUPPLY
Power supply terminal block connector.
(2) TP1
Clamping adjustment trimmer.
(3) VIDEO INPUT
Video input terminal block connector.
(4) J1
Pre-emphasis jumper.
(5) TWISTED-PAIR OUTPUT
Twisted-pair terminal block connector.
(6) J2
Output impedance jumper.

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CONNECTIONS
•Be sure to switch-off the power supply unit
before connecting to other equipment.
•Also refer to the instruction manual of the
equipment to be connected.
INSTALLATION
(1) Set the jumper J1 to 0 dB.
(2) Set the jumper J2 to correct position. (125 ohm for PE or PAPER, 90 ohm for PVC cable insulation)
(3) Connect the power supply unit (AC or DC) to the K3.
(4) Connect the video test generator (1 Vpp / 75 Ω) to the K1.
(5) Switch-on the power supply unit.
(6) Switch-on the video test generator.
(7) Check the positive video output signal between A and ⊥.
(8) Check the negative video output signal between B and ⊥.
(9) Switch-off the power supply unit.
(10) Switch-off the video test generator.
(11) Disconnect the video test generator.
(12) Connect the twisted-pair cable to the K2.
(13) Connect the video source (video camera) to the K1.
Note:
•Do not adjust the trimmer TP1.

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APPEARANCE
SPECIFICATIONS
Video input :1 Vpp, 75 Ω
Video output :2 x 2 Vpp
Output impedance :125 Ω/ 90 Ω(J2)
Freq. response :30 Hz -5 MHz (−0.5 dB)
Pre-emphasis :+10 dB, 5 MHz (J1)
Power supply :24 V, AC/DC, 100 mA max.
Power supply protection :varistor
Casing :ABS
Dimensions :106(W) x 55.5(H) x 100(D) mm
Protection :IP -65 (VDE)