User's Manual

transmission. *TXEMER* flashes on line 2 in the display until the

emergency is cleared.

3. Press PTT and speak into the microphone in a normal voice.

4. Release PTT when the transmission is complete and listen for a reply.

5. The emergency can be cleared by pressing and holding the

c button

followed by pressing the

E button then releasing both buttons.

SYSTEM SCAN OPERATION

The radio can be programmed with the following System Scan features. These

features are automatically enabled upon radio power up. A key or menu option

is also defined to allow the System Scan features to be toggled during radio

operation. This is covered in the Menu Selection and Pre-Programmed

Keypad Key sections. The System Scan state will be maintained through

system changes but will default to ON at power up.

Wide Area System Scan

The M7100

Series mobile radio can be programmed for wide area system

scan operation for multi-site applications. Upon the loss of the currently

selected system's control channel, radios can be programmed to automatically

scan the control channels of other systems. If a new control channel is found,

the radio will switch to the new system and sound an alert tone.

ProSound

The radio can be programmed for ProSound system scan operation for multi-

site applications. ProSound is an enhanced multi-site system scanning

algorithm, compared to Wide Area System Scan. ProSound provides the radio

with the ability to select a new system for the radio to communicate on, when

the selected system drops below a predefined level. This is accomplished by

enabling each radio to analyze the signal quality of its current control channel

and compare it with the signal quality of the control channel for each site in its

adjacency scan list. (The signal quality metric used for the ProSound

algorithm is based on Digital Received Signal Strength Indicator [RSSI]

measurements.) When the selected system’s signal quality level degrades

below a pre-programmed level, the radio will begin to look for a better control

channel. Once a control channel that exceeds the pre-programmed parameters

is found, the radio will change to the new system and emit a tone. If the

control channel is completely lost the radio, will enter Wide Area System

Scanning and search the programmed adjacent systems until a suitable control

channel is found.