User's Manual

20-527 Owner’s Manual Draft
Page 15 of 60
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 specific 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 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 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.
LTR Mode
You can set your scanner so it decodes the talk group IDs used with LTR systems. This setting is called
the LTR mode.
LTR systems are trunking systems used primarily by business or private communications service
providers, such as taxicabs, delivery trucks, and repair services. There systems encode all trunking
information as digital subaudible data that accompanies each transmission. Users on an LTR system are
assigned to specific talk groups, which are identified by the radio as six-digit numbers. These numbers
are in the form AHHUUU, where:
A = Area code (0 or 1)
H = Home repeater (01 through 20)
U = User ID (000 through 254)
When the scanner receives a transmission on a channel set to the LTR mode, it first decodes the LTR
data included with the transmission. In the open mode, the scanner stops on the transmission and
displays the talk group ID on the bottom line of the display. In the closed mode, the scanner only stops on