Manual Uniden BC250D (page 73 of 110) (English)

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Motorola Reception

Motorola Tracking

There are really two types of Motorola trunking systems.

These are usually referred to as Type I and Type II systems.

Type I only occurs on some 800 MHz systems. All VHF, UHF

and 900 MHz trunking systems use Type II.

One important distinction between these two systems is the

amount of data transmitted by each radio when its push-to-

talk button (PTT) is pressed. Every radio in a trunked system

is assigned a unique ID so the central site computer can

identify it when it’s used. Both Type I and Type II systems

place radios (or radio users) into groups, called talkgroups,

and these talkgroups are also assigned unique IDs. Some

radios have access to only one talkgroup, while others have

access to many talkgroups. The talkgroup(s) each radio can

access is called the radio’s affiliation(s).

In a Type II system, when someone uses their radio, only the

radio ID is transmitted when PTT is pressed, whereas in a

Type I system the radio ID and its current affiliation are both

transmitted when PTT is pressed.

Why the difference? Type II systems are slightly more

advanced because the central computer maintains a database

which is used to determine each radio’s affiliation(s).

Changes to a Type II system are easier than Type I because

the system manager only needs to update the database

instead of reprogramming individual radios.

Another difference between the systems is that Type I

systems are arranged in a Fleet-Subfleet hierarchy.

For example, its possible for a city using a Type I system to

designate 4 Fleets, each with 8 Subfleets. Their fleets might

be the Police Department, the Fire Department, Utilities, and

Administration. The Police may decide to further divide their

fleet into subfleets such as Dispatch, Tactical Operations,

Detectives, North, South, East and West Side Patrols, and

Supervisors. All the available police radios would then be

assigned to one of the police subfleets. Determining the exact

Fleet-Subfleet hierarchy for a particular area is referred to as

Fleet Map Programming, which is discussed further in this

manual.

The disadvantage of a Type I system is that when PTT is

pressed, the brief burst of data 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, and as a result Type I

BC250D 11/6/2 11:37 AM Page 69

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Uniden BC250D Manual

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