Manual RadioShack PRO-90 - 300 Channel (page 33 of 64) (English)

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The fleets might be the police department, the fire de-

partment, utilities, and city administration. The police

might decide to further divide its fleet into subfleets such

as dispatch, tactical operations, detectives, north, south,

east and west side patrols, and supervisors. All the avail-

able police radios would then be assigned to one of the

police subfleets, letting the police centralize their com-

munications and control the type of users on a single

system. Determining the exact fleet-subfleet hierarchy

for a particular area is referred to as fleet map program-

ming.

The disadvantage of a Type I system is that the brief

burst of data sent when a user transmits must contain

the radio’s ID and its fleet and subfleet. This is three

times the amount of data a Type II system radio sends.

Since the data capacity of Type I systems is limited and

the amount of data increases with each user, Type I sys-

tems usually accommodate fewer users than Type II

systems. Nevertheless, Type I systems are still in use.

There are also

hybrid

systems which are a combination

of both Type I and Type II. Your scanner defaults to

monitor Type II systems, but you can change to Type I or

a hybrid of Type I and Type II systems by selecting a

preprogrammed fleet map or creating a custom fleet

map for your area (see “Scanning Type I and Hybrid

Trunked Systems” on Page 44).

You do not need to determine the fleet-subfleet hierar-

chy for Type II systems unless you are tracking hybrid

systems that contain both Type I and Type II systems.

SETTING THE SCANNER TO THE

TRUNK TRACKING MODE

Repeatedly press

TRUNK

to switch between the scan-

ner’s conventional and trunk tracking modes.

20-520.fm Page 33 Wednesday, August 4, 1999 3:06 PM

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RadioShack PRO-90 - 300 Channel Manual

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