17
EDACS (ED) mode
You can set your scanner so it decodes the talkgroup IDs used with EDACS
(invented by 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 organiza-
tions. EDACS systems transmit active talkgroup information only on a dedi-
cated 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 talkgroup IDs are entered as a 4-digit decimal num-
ber 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 talkgroup. In the
open mode, the scanner then goes to the transmission and displays the
talkgroup 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 an-
tenna 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 talkgroup CTL-XX or
ID number. Try changing your location or using an outdoor antenna to improve
reception.
