Receiver-transmitter Unit, Power Supply Control Unit and Battery Supply Unit Functional

C 1, TM 9-1240-369-34

transmitter component assembly contains the ruby rod

in response to minimum and maximum range citeria, and

and its flashtube. the transmitter optics (relay prisms,

provides range timing by means of a crystal oscillator

folding prisms, resonant reflector, and porro prism), and

and three counters. The reply gating card contains

the recollimating telescope. A rotating relay prism on the

nearly all circuitry for self-test, including a test oscillator

Q-switch actually controls development of the single

for development of continuous simulated A-trigger, video.

"giant" laser pulse, by creating for an instant an optical

and reset pulses to enable oscilloscope checks. These

resonant cavity (hence, by analogy to a magnetron

circuits (without the test oscillator) are used in test mode

cavity, the "Q" term ) while the flashtube is "pumping" the

operation to obtain simulated ranges for readout by

ruby rod. The resulting laser pulse is transmitted through

repeatedly pressing the RANGE switch to fill tile counter.

two transfer prisms and the scan prism to the target.

The select logic card controls the three counters. The

The returning pulses from the target are detected by a

counters card contains three identical counter, each of

photomultiplier tube and processed by the video

which consists of three decade counters for storing

amplifier. The data processing function stores range

binary coded decimal (BCD) ranges in thousands,

data for up to three targets that might be detected.

hundreds. and tens. A counter is not required for the

Timing is provided by the A-trigger sensor assembly and

units readout indicator, because it registers only 0 or 5.

the A-trigger reply utilizes a phototransistor that samples

The counters card also develops overrange and 9995

(counter full) signals used by the select logic and reply

the laser flash to start the counters. The malfunction

gating. Test circuits within the power supply unit monitor

3/buffer logic printed circuit card provides driving circuits

for the A-trigger and video signals and generates a

signals and produce malfunction signals which are

malfunction 3 signal. The interface circuits provide line

displayed on the RANGE (METERS) indicator when a

receivers for the test range signal and line drivers for the

malfunction occurs.

b. Receiver-transmitter Unit, Power Supply Control

A-trigger and video signals. An EVENTS counter in the

Unit and Battery Power Supply Unit Functional

receiver-transmitter unit counts each time the laser

flashtube is fired. Data processing is shared among four

Operation. Figure 1-3 is a functional block diagram of

printed circuit cards located in the power supply unit:

the receiver-transmitter unit power supply unit and

reply gating, select logic, counter, and an interface card.

battery power supply unit.

The reply gating card counts the replies, gates the video

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