ASTEL TRP 101, Руководство по эксплуатации

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3
PREFACE
The video twisted-pair receiver TRP 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
•
low power consumption
•
over-voltage protection
•
max. +60 dB gain at 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
INPUT
IMP.
HF
ATTEN.
INPUT
IMPEDANCE
ADJ.
HF
ATTEN.
JUMPER
SYMMETRY
VOLTAGE
REGULATOR
SYMMETRY
ADJ.
LINEAR
GAIN
LINEAR
GAIN
ADJ.
HF
GAIN
LF GAIN
ADJ.
LF GAIN
SW7
SW8
SW9
SW10
SW11
SW12
SW1 SW2 SW3 SW4 SW5 SW6
SECTION I
SECTION II
HF GAIN
ADJ.
HF-III MF-III LF-III
SW13 SW14 SW15
SECTION III
SECTION
IV
SW16
5 MHz
LOW-PASS
FILTER
CLAMPING
GREEN RED
POWER
ON
VIDEO
SIGNAL
ERROR
OUTPUT
STAGE
VIDEO
OUTPUT
HF MF LF HF MF LF
HF MF LF
AC-IN
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
230VAC outlet.