CHAPTER 6 FUNCTIONING OF EQUIPMENT - TM-5-6350-262-14-20027

CHAPTER 6

FUNCTIONING OF EQUIPMENT

SIMPLIFIED FUNCTIONAL OPERATION

Section I.

6-1. General

sounds received by the receiver are amplified by

The processor/receiver ultrasonic passive signal

broad-band amplifiers (three amplifiers stagger

senses high frequency sounds in the range of 20 kHz

tuned) in the processor. The output from the

to 30 kHz. These sounds are produced during forced

broad-band amplifiers can be coupled directly to the

penetration by sawing, hammering, and burning by

detection circuits when a processor/transceiver

torch through metal, masonry walls, doors, metal

ultrasonic motion signal is not operating in the same

mesh, bars, shuttered windows, ventilation open-

area or coupled through the band rejection filter

ings, etc. The equipment is insensitive to sounds

when operating in conjunction with a

generated below 20 kHz and above 30 kHz.

processor/transceiver ultrasonic motion signal and a

synchronizing pulse is provided. Terminal board TB3

6-2. Simplified Functional Operation (fig.

provides a convenient means of connecting or

bypassing the band rejection filter from the operat-

a. T h e p r o c e s s o r / r e c e i v e r u l t r a s o n i c p a s s i v e

ing circuit.

signal contains a processor which processes data

NOTE

from the receivers. Each receiver enclosure contains

The processor will not operate correctly if the band

a microphone which has a flat response between 20

rejection filter is incorporated in the circuit without a

kHz and 30 kHz (ultrasonic range). Ultrasonic

synchronizing pulse input.

FROM PROCESSOR/TRANSCEIVER

ULTRASONIC MOTION SIGNAL

ME 6350-262-14/2/6-1

Figure 6-1. Processor/receiver ultrasonic passive-simplified block diagram.

6-1