3
PREFACE
The video twisted-pair transmitter TTP 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. The choice of
output impedance allows the use of different kinds
of cables. Pre-emphasis selection enables better
video transmission through the long distances.
FEATURES
•
small dimensions
•
simple connecting
•
low power consumption
•
over-voltage protection
•
dual output impedance
•
pre-em10 dB / 5 MHz
PRECAUTIONS
•
Use only the power source specified on the
rating label located on the casing.
•
When not using this unit for a long period of
time, or when cleaning it, be sure to disconnect
the power plug from the AC outlet.
•
Avoid using this unit under the following
conditions:
-in extremely hot or cold places,
-near appliances generating strong magnetic
fields, and
-in places subject to direct sunlight
•
Unplug this unit from the AC outlet and refer
servicing to qualified service personnel under
the following conditions:
-when the power cord is frayed or plug is
damaged
-if the unit does not operate normally following
the operating instructions
-if the unit has been dropped or the cabinet has
been damaged
-when the unit exhibits a distinct change in
performance.
BLOCK DIAGRAM
VOLTAGE
REGULATOR
AC-IN
TWISTED-PAIR
OUTPUT
A
B
PRE-EMPHASIS
OUTPUT
IMPEDANCE
PRE-EMPHASIS
+10dB
IMPEDANCE
JUMPER
75 ohm
JUMPER
OUTPUT
A
PRINCIPLE OF OPERATION
The input is closed with the impedance of 75
Ω
.
Then follows the stage which defines the pre-
emphasis. By means of the amplifier stage two
signals separated by 180
°
appear on the output A
and B.
The output impedance jumper enables a choice of
output impedance - 125
Ω
or 90
Ω
.
The power is supplied by connecting to the
230VAC outlet.
