21
Type II system talk groups are identi-
fied by a 5-digit number. Valid talk
group IDs are divisible 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-subfleet and 5-digit formats for
talk group IDs.
Note: If the scanner decodes control
channel data while receiving transmis-
sions from a Motorola trunking sys-
tem,
CNTRL
appears on the bottom
line of the display. For example:
EDACS Mode
You can set your scanner so it de-
codes the talk group IDs used with
EDACS (GE/Ericsson) trunking sys-
tems. This setting is called the
EDACS mode
.
EDACS systems are trunking systems
used primarily by business or private
communications service providers, as
well as by some public safety organi-
zations. EDACS systems transmit ac-
tive talk group information only on a
dedicated control channel.
EDACS frequencies are organized in
a specific order. Each frequency is as-
signed a Logical Channel Number
(LCN). For the scanner to correctly
switch to an active frequency, you
must program the frequencies in LCN
order, starting with Memory 01.
EDACS talk group IDs are entered as
a 4-digit decimal number from 0000 to
4096.
When there is activity on an EDACS
system, that information is sent out on
the control channel. The scanner de-
codes the ID for the active talk group.
In the open mode, the scanner then
goes to the transmission and displays
the talk group ID on the bottom line of
the display. In the closed mode, the
scanner only goes to transmissions
that have IDs that match a talk group
ID that you have stored in the bank’s
talk group ID list and have not locked
out.
Because EDACS scanning requires
clear reception of the control channel
at all times, EDACS systems tend to
have a smaller usable area. An exter-
nal antenna can greatly improve
EDACS scanning in a fringe area. If
you are having trouble scanning an
EDACS system, try manually select-
ing the data channel. If you are getting
good reception, the scanner will indi-
cate talk group
CTL-01
. Try chang-
ing your location or using an outdoor
antenna to improve reception.
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