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RadioShack PRO-2053 - 300 Channel Manual

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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
… 13 …


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