Manual RadioShack PRO-90 - 300 Channel (page 32 of 64) (English)

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TRUNK TRACKING

Your scanner is designed to track transmissions on Mo-

torola Type I, Type II, and hybrid analog trunking sys-

tems, which are extensively used in 800 MHz

communications. Remember these important points

when tracking transmissions:

• Your scanner monitors Type II systems by default.

However, you can change this if the system in your

area is different (see “Types of Trunking Systems”

below and “Scanning Type I and Hybrid Trunked

Systems” on Page 44 for more information).

• Your scanner cannot track transmissions on non-

Motorola trunking systems.

• Your scanner cannot track an 800 MHz trunked sys-

tem and scan frequencies in conventional mode at

the same time.

• The frequencies for many of the 800 MHz public

safety systems are listed in the separate “National

Public Safety Trunked System Frequency Guide”

included with your PRO-90.

TYPES OF TRUNKING SYSTEMS

Your trunk tracking scanner can monitor two basic types

of systems —

Type I

and

Type II

. Instead of selecting a

specific frequency to transmit on, a trunked system

chooses one of several frequencies in a 2-way radio us-

er’s talk group when that user presses PTT (push to talk).

Thus, trunking systems allocate a few frequencies

among many different users, but the way Type I and

Type II systems do this is slightly different. One important

distinction between these systems is the amount of data

transmitted by each radio when its push-to-talk button

(PTT) is pressed. In a Type I system, the radio’s ID and

its current affiliation (the trunk system it belongs to) are

both transmitted. In a Type II system, only the radio’s ID

is transmitted.

Why the difference? In Type I systems, each radio in the

trunk group individually transmits its own affiliation, while

the trunk system maintains a database that determines

each radio's affiliation(s) in Type II systems.

Another difference between the systems is that Type I

systems are arranged in a fleet-subfleet hierarchy. For

example, it is possible for a city using a Type I system to

designate 4 fleets, each with 8 subfleets.

20-520.fm Page 32 Wednesday, August 4, 1999 3:06 PM

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RadioShack PRO-90 - 300 Channel Manual

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