Bedienungsanleitung RadioShack PRO-2053 - 300 Channel (Seite 13 von 56) (Englisch)

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About Your Scanner

Motorola systems are trunking systems used

primarily by business and public safety

groups to efficiently allocate a small number

of frequencies (as few as five) to many

groups of users (as many as several thou-

sand). To do this, each group of users in the

system is assigned to a specific talk group.

For example, the east side patrol officers

might all be assigned to talk group 2160.

One channel in the system is continuously

transmitting data that identifies which talk

groups are active on which channel. In addi-

tion, this talk group information is also trans-

mitted as subaudible data on each active

channel.

When the scanner receives a transmission

on a channel set to the Motorola mode, it first

decodes the talk group ID data included with

the transmission. In the open mode, the

scanner stops on the transmission and dis-

plays the talk group ID on the bottom line of

the display. In the closed mode, the scanner

only stops on the transmission if the talk

group ID matches a talk group ID that you

have stored in the bank's talk group ID list

and have not locked out.

Motorola trunking systems come in three cat-

egories: Type I, Type II, and Type I/II Hybrid.

Each category displays and uses talk group

IDs in slightly different ways.

Motorola Type I IDs are in the form FFF-SS,

where:

FFF=Fleet ID

SS=Subfleet ID

Type I systems are usually organized with

different user groups assigned to different

fleets. For example, a valid fleet-subfleet ID

identifying all detectives within a police de-

partment might be

òòòVñð

òòòVñðòòòVñð

òòòVñð

, where 000 identi-

fies all police users and 12 identifies the

Detective division.

To properly map the raw Type I data to the

correct fleet-subfleet format, you must pro-

gram the correct fleet map into the scanner.

Fleet map information is widely available on

the Internet for most Type I systems in use.

Type II system talk groups are identified by a

5-digit number. Valid talk group IDs are divis-

ible by 16. If you try to enter an invalid talk

group ID, the scanner rounds the ID down to

the next valid ID.

Type I/II hybrid systems use both fleet-sub-

fleet and 5-digit formats for talk group IDs.

Note:

If the scanner decodes control channel

data while receiving transmissions from a

Motorola trunking system,

á*0.(

á*0.(á*0.(

á*0.(

appears on

the bottom line of the display.

EDACS Mode

You can set your scanner so it decodes the

talk group IDs used with EDACS (GE/Erics-

son) trunking systems. This setting is called

the EDACS mode.

EDACS systems are trunking systems used

primarily by business or private communica-

tions service providers, as well as by some

public safety organizations. EDACS sys-

tems transmit active talk group information

only on a dedicated control channel.

EDACS frequencies are organized in a spe-

cific order. Each frequency is assigned a

Logical Channel Number (LCN). For the

scanner to correctly switch to an active fre-

quency, you must program the frequencies in

LCN order, starting with

)<DFIPý òñ

)<DFIPý òñ)<DFIPý òñ

)<DFIPý òñ

. EDACS

talk group IDs are entered as a 4-digit deci-

mal number from 0001 to 2047 or AFS

(Agency Fleet Subfleet) number from 00-001

to 15-157.

When there is activity on an EDACS system,

that information is sent out on the control

channel. The scanner decodes the ID for the

active talk group. In the open mode, the

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