CHAPTER 2 SERVICE UPON RECEIPT AND INSTALLATION

CHAPTER 2

SERVICE UPON RECEIPT AND INSTALLATION

Section I. EQUIPMENT PLANNING

2-1. General

coverage may be reduced to 56%.

When eight

transceivers are used under quiet conditions the range is

reduced to approximately 90% (31.5 feet) and for

Equipment planning involves becoming familiar with the

turbulent conditions approximately 62% (22 feet) while

capabilities of the processor and the transceiver used to

the area coverage is down to 81% for quiet conditions

survey the area and the area that is to be protected

and 40% for turbulent conditions. From the analysis of

against intrusion. A processor is capable of operating

figure 2-2 it becomes apparent that the efficiency per

with one to twenty transceivers connected by cable up to

transceiver is maximized by avoiding turbulent

a length of 500 feet. To determine the number and the

conditions.

placement of transceivers required, investigation of the

size of the area, area environmental conditions and area

reflective properties must be performed.

2-3. Area Surveillance

NOTE

The most effective protection is given to areas within

line-of-sight of a transceiver. Additional coverage is

obtained through reflections, and is dependent on the

Before permanently mounting the

particular geometry. Large objects in a room may

transceivers in a given location, a walk

produce insensitive areas (shading) on the side away

test of each anticipated location (with

from the transceiver.

Large rooms which are

the equipment operating should be

compartmentalized by high furniture, equipment, racks,

performed to insure that proper

stacks of stored material, etc., are best protected when

coverage will be obtained.

they are regarded as several smaller rooms with each

open (line-of-sight) area covered by a transceiver. Line-

NOTE

of-sight operation alone prescribed travel lanes in

The following installation procedures

storage areas insures positive protection as storage

must be made with the assistance of

material is added, removed, or shifted to other areas.

Direct Support (intermediate) or higher

2-4. Area Environment

level maintenance personnel.

Mounting locations of transceivers should be

2-2. Equipment capabilities.

substantially free of air turbulence which is a source of

Each transceiver provides an egg-shaped volume of

noise and tends to reduce the maximum range and

coverage with its maximum dimensions approximately

coverage area. Maximum coverage is obtained in still

as shown in figure 2-1. This area will shrink for each

air. If possible, do not locate the transceiver adjacent to

transceiver as the number of transceivers are added

fans, air ducts, or radiators. Vibrations transferred to the

and as the air turbulence increases. As transceivers are

transceiver from the mounting surface can also cause

added, the coverage of each one is reduced as shown in

reduced sensitivity; therefore, be sure that the mounting

figure 2-2.

For a single transceiver, under quiet

surface is solid and free from vibration. Consider the

conditions, full coverage (25 by 35 feet, figure 2-1) is

possible activity of adjacent heavy machinery, that may

obtained. For a turbulence condition the range may be

be operating during periods of surveillance operation,

reduced to 75% (approximately 26 feet) and the area

which could result in a potential source of vibration.

Figure 2-1. Nominal coverage of a single transceiver.

2-1