ASTEL TR 101, Руководство по эксплуатации

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3
PREFACE
The video twisted-pair receiver TR 101 is a
correction amplifier with symmetrical input and the
standard asymmetrical video output. It is mounted
in ABS casing. The numerous trimmers help to
adjust the input impedance, symmetry, linear gain and rough or fine gain adjustment at different
frequencies. There are LED1 and LED2 which
indicate the power-on and the video signal error in
the video input of the receiver.
FEATURES
•
small dimensions
•
AC/DC power supply
•
low power consumption
•
over-voltage protection
•
max. +60 dB gain at 5 MHz
BLOCK DIAGRAM
PRINCIPLE OF OPERATION
The input stage enables the setting of the input
impedance and symmetry.
The minimal high frequency gain is 6 dB and the
high frequency attenuation should be switched-on
at short distances.
The next two stages enable the linear gain
adjustment and the square-wave response
adjustment. There follow the filter stages with
sixteen switches and their adequate elements for
the fine adjustment with total gain from +6 to +60
dB. In the end there are the low-pass filter and the
clamping circuit with the indication of power-on
(the green LED) and the video-signal-error
indication (the red LED).
With the help of the output stage the standard
video output with the impedance of 75 ohm is
achieved.
The power is supplied by connecting to the AC or
DC power supply unit.