Section III. THEORY OF OPERATION - TM-9-1240-369-340011

TM 9-1240-369-34

KEY to figure 1-1:

1-4. Tabulated Data.

1. R/T Control C-8728/VVG-1(A75)-11738851

Refer to TM 9-2320-230-10-2-3 for physical and

2. Headrest Assembly-117349

system performance characteristics of the laser range

3. Laser Receiver-Transmitter R/T-1021/VVG-1(A76)-

finder.

11738821

4. Battery Power

Supply PP-6607/VVG-1(A78)-

11738841

5. Laser Ranging Commander's Control C-135/VVG-

1(A77)-11738831

6. Laser Power Supply Control C-9135/VVG-1(A77)-

11738831

Section III. THEORY OF OPERATION

a transmitter that develops and transmits the laser

1-5. Scope.

pulses, a receiver for receiving and converting the

This section contains the overall system functional

reflected light from the target to electrical signals, data

description and functional theory of the laser range

processing circuits and built-in test circuitry. In addition

finder. Paragraph 1-6 defines the purpose of this

to the laser and processing circuits. the system contains

section. Paragraph 1-7 contains the system functional

a R/T control unit which provides control over the

description and system functional block diagrams.

receiver-transmitter unit. and a commander's control unit

Paragraph 1-8 contains the system self test functional

which controls the system and provides displays for the

theory with each self test discussed separately.

operator and a battery power supply unit which provides

additional power for operating the system. As depicted

1-6. Purpose.

by figure 1-2, all of the commander's controls are located

The purpose of this section is to familiarize personnel

on the commander's control and R/T control units. The

with the function of the laser range finder and its units.

laser range finder has four functions; control and display,

The information presented provides both a basic and a

power control and generation, transmitting-receiving and

detailed understanding of the laser range finder and aids

data processing. The control and display function

in the troubleshooting and repair of the system.

comprises all circuitry in the commander's control and

R/T control units. The control and display function

1-7. System Functional Description.

consists of the operator controls and indicators and the

a. General.

malfunction logic which assists in isolating malfunctions

NOTE

that might occur in the system. The power control and

Signal nomenclature on all block and

generation function comprises the battery power supply

functional diagrams and schematics

unit, preregulator, and two printed circuit cards in the

expresses the "high" (true) state of

power supply control unit. These circuits generate -1600

the signal.

For example, reset

V for the photomultiplier tube (PMT), + 10 v for the light

indicates that the signal level is

emitting diodes (readout display), + 15V for biasing and

"high" when the condition is NOT

lights, + 5 V and -5 V for logic circuits, and +29 V for the

reset-that is, when the RESET switch

automatic gain control (agc) circuitry. Either the tank

has not been pressed.

power or the battery in the battery power supply unit

supplies the +24 V Q-switch motor power, depending

As shown in the block diagram (fig. 1-2) the laser

upon which has the higher voltage. The transmitting-

range finder operates upon control signals generated by

receiving function develops the laser pulse and converts

the commander's control and R/T control units. The

the reflected light from the target into a video signal. The

commander operates the laser range finder by using the

pulse forming network (PFN) charge power supply

RANGE and RESET switches. and the azimuth and

charges the PFN so that it can provide the large energy

elevation controls on the R/T control unit. In addition, a

requirement of the flashtube when it is fired. The PFN

RTCL ILLUM control on the R/T control unit provides

charge power supply applies the fire signal to the

control of reticle lighting for operations in low light

transmitter logic circuit card assembly. The transmitter

conditions. On the commander's control unit, the LASER

logic develops SCR trigger and reset signals and, under

MODE

CONTROL

switch,

RANGE

RETURN

control of the Q-switch magnetic pickup, drives the Q-

SELECTOR switches, test switch (TSW), and dimmer

switch in the transmitter component assembly. The

(DMR) switch are used. The laser range finder contains

1-3