ASTEL TRR 101, Operating Instructions Manual

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3
PREFACE
The video twisted-pair receiver TRR 101 is a
correction amplifier with a symmetrical input and
the standard asymmetrical video output. It is
suitable to fit in a 19” standard rack 3U. 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
•
19”/3U rack mountable
•
small dimensions 3U/6TE
•
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.