24
The Basics
EDACS mode
You can set your scanner so it decodes the talk group IDs
used with EDACS (GE/Ericsson) trunking systems. 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 organizations. EDACS systems
transmit active talk group information only on a dedicated
control channel.
EDACS frequencies are organized in a specifi c order. Each
frequency is assigned 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 0001 to 2047 or AFS (Agency Fleet
Subfl eet) 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 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 with IDs that match talk
group IDs you have stored in the bank’s talk group ID list
which are 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 external antenna can greatly improve
EDACS scanning in a fringe area. If you are having trouble
scanning an EDACS system, try manually selecting the data
channel. If you are getting good reception, the scanner will
indicate talk group CTL-01. Try changing your location or
using an outdoor antenna to improve reception.
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