Sepura SC21 Series User Manual

DMO options
You can select the following DMO options:
Presence Check
Specify whether Presence Checking is performed before DMO Individual calls are made. When
Presence Checking is On your radio checks whether the intended receiving radio is available and in
radio contact before it attempts to set up the call.
GW/Rep Filter
Specify whether your radio uses or ignores any gateway and/or repeater it detects.
In the Gateway/Repeater Filter screen select one of the following options:
No GW/Rep—do not use any gateways and repeaters detected by your radio
Use Repeater—Use repeaters detected
Use Gateway—Use gateways detected
If the radio selects a gateway, a gateway icon is displayed on the status line. If the gateway
stops sending a presence signal it will no longer be detected by your radio.
Repeater Mode
A radio acting as a repeater provides a service to other radio users. It extends the range and
enhances the reliability of Direct Mode communication compared with basic direct communication
between radios.
You can use a repeater to enable communication between radios which are out of range of each
other. The following diagram shows radios A, B and C and a repeater which are on the same DMO
talkgroup. A, B and C are in range of the repeater. Because of its location, the repeater can pass
communications between A, B and C even though they are out of range of each other.
User Guide 81

Sepura SC21 Series Specifications

General

IP Rating	IP54
Operating Temperature	-20°C to +55°C
Channel Spacing	25 kHz
Ingress Protection	IP54
Channels	Up to 2000
Frequency Bands	380-430 MHz, 806-870 MHz
Battery Life	Up to 14 hours
RF Power Output	1W
TETRA Air Interface	ETSI EN 300 392-2