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Reply gating card (operational circuits)
TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
Boresight/field Stop Assembly
TM 9-1240-369-34
range to the target exceeds the systems capacity, the
9995 signal, developed when the counters are full and
components,  boresight  and  field  stop  assembly
the min range signal, developed for a period immediately
photomultiplier, video amplifiers, A-trigger assemblies,
after laser pulse transmission in order to close the video
and a malfunction 3/buffer logic card.
(a) Transmitter logic and transmitter logic
gate to spurious nearby backscattered returns from
component cards.  The transmitter logic circuit card
surface objects. The test range gate circuit applies a
test range signal to the video amplifier during the test
assembly performs these functions: switching for the Q-
mode.  The reset and malfunction 8 logic circuitry
switch assembly senses the speed of the Q-switch motor
contains a flip-flop that is set to the malfunction state by
to provide triggering for the flashtube, and it generates
the reset signal, and reset to the nonmalfunction state by
the SCR-trigger signal for the reset flip-flop and the reset
inputs from 100-meter signals from each counter. Thus,
signal for the fire logic circuit in the PFN charge power
failure of any of the three counters to count results in
supply.  The transmitter logic component assembly
generation of a malfunction 8 signal for application to the
contains the trigger transformer for firing the flashtube.
digital indicator.
When the fire signal is applied to the Q-switch power
(g) Interface circuit card. The interface circuit
switch circuit, a return path for the motor is closed and
card serves as an interface between the power supply
the motor starts. The motor coasts to a stop when the
control unit and the receiver-transmitter unit.
fire signal is removed. The Q-switch timing circuit acts in
interface circuit buffers and inverts the A-trigger, video
conjunction with the Q-switch speed sensing circuit to
min range inhibit and test range signals; generates the
determine when the motor has increased to the speed
malfunction 2 and 4 signals; and generates a +15 V
required before firing of the laser can occur.  These
interlock to prevent the PEN from charging in the test
circuits compare the fixed-length pulse of a monostable
mode. The interface circuit receives the A-trigger and
multivibrator with the time interval of magnetic pickup
video signals from the malfunction 3/buffer logic card
pulses from the Q-switch. A linear ramp is generated in
and sends the A-trigger and video signals to the reply
the Q-switch timing circuit, and at the end of the timing
gating circuit. The interface card also receives the reset
cycle the SCR trigger timing logic circuit, if the Q-switch
signal from the R/T control unit and sends the reset (1)
speed is high enough, generates a signal that is inverted
signal to the counters and reply gating circuits. The reset
and applied to the flashtube trigger SCR.  The SCR
(2) signal is sent from the interface card to the PEN
trigger timing logic simultaneously generates the SCR
charge power supply.
trigger signal.
(b) Transmitter component assembly.  The
When the system is operating in the test mode the
test signal comes through transistor Q2 and inhibits the
generation of a +15 V interlock which in turn prevents the
recollimating  transmitter  telescope,  the  Q-switch
PEN from charging in the test mode.
assembly, the flashtube and ruby rod, and associated
Malfunction 2 is generated from malfunction 7 and
optics.  The flashtube requires two voltages: a high
malfunction 8. Malfunction 7 and malfunction 8 are OR'd
voltage to fire it and a sustained voltage. Upon firing, the
together and when either is low, this causes the
flashtube trigger SCR dumps + 400 volts stored in a
commander's control unit MALF light to illuminate and a
capacitor through the primary of a transformer. A pulse
"2" readout to be seen on the RANGE (METERS)
of about + 10 kv developed in the secondary in series
indicator showing that a malfunction has occurred in
with the + 1200 V from the PFN ionizes the gas in the
either the reply gating or counters circuits. Malfunction 4
flashtube and the stored energy in the PFN dumps into
is generated as a result of fault in the PEN circuit. When
the flashtube sustaining its output until the laser pulse is
the RANGE switch is activated. the fire signal should
generated. An elliptical reflector directs the light from the
come through and clear the flip-flop circuit (Z, 5). If the
flashtube into the ruby rod.  which forms an optical
fire signal is not generated, the flip-flop will go high and
resonant cavity with a reflective porro prism at one end.
cause the MALF light to illuminate, and a "4" readout to
two relay prisms with 4.5 degree hypotenuse angles to
be seen on the RANGE (METERS) indicator.
fold the beam 180 degrees, and a resonant reflector that
The test range signal comes in and is buffered and
is partially reflective and partially transmissive at the
sent to the malfunction 3 / buffer logic circuit.
output end. One of the relay prisms is mounted on the
(2) Receiver-transmitter  unit.
The  receiver-
Q-switch assembly. It is rotated at a specific speed to
transmitter unit consists of the following circuits or
govern the precise time of development of the laser
pulse; it serves as a "Q-spoiling" device except for a brief
instant when it is alined to form a resonant optical

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