ASTEL TT 101 User manual
TT 101
VIDEO TWISTED-PAIR TRANSMITTER
OPERATING INSTRUCTIONS v2.0
2
CONTENTS
Preface....................................................................................................................................................... 3
Features ..................................................................................................................................................... 3
Block diagram............................................................................................................................................. 3
Principle of operation.................................................................................................................................. 3
Controls and connectors ............................................................................................................................ 4
Connections ............................................................................................................................................... 5
Installation .................................................................................................................................................. 5
Appearance................................................................................................................................................ 6
Specifications ............................................................................................................................................. 6
This unit is produced to comply with Directive
89/336/EEC.
3
PREFACE
The video twisted-pair transmitter TT 101 is a
correction amplifier with the standard
asymmetrical video input and symmetrical output
which is adjusted to connect the twisted-pair
cable. It is mounted in 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 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.
4
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.
5
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.
6
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)
7
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ASTEL d.o.o., Dutovlje 138, 6221 Dutovlje, Slovenia
Tel: +386 5 7310771, +386 5 7310772
Fax:+386 5 7310789
E-mail: [email protected]
Web: www.astel-cctv.com
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