User Manual

42
When ProScan is Enabled
The radio monitors the priority system and will switch to the priority system if
the criteria defined by the controls in the ProScan Options dialog box are met.
If ProScan is enabled, the rate at which the radio will scan for the priority
system is defined by the System Sample Time control, located in the ProScan
Options dialog box.
ProScan
The radio may be programmed for ProScan system scan operation for multi-
site applications depending on the version of radio flash code. ProScan is an
improved multi-site system scanning algorithm designed to replace
ProSound
™
scanning. ProScan 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 compares it with
the signal quality of the control channel for each site in its adjacent scan list.
(The signal quality metric used for the ProScan algorithm is based on a
combination of both Received Signal Strength Indicator (RSSI) and Control
Channel Verification (CCV) measurements.) When the selected system
degrades to 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 enabled through programming). 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.
Menu Selection
Press
 and then use the  or  buttons to scroll through the selections
until SYS SCAN is displayed. Then press  to toggle the System Scan
state. The SYSC ON or SYSC OFF display message is displayed for two
seconds to show the new state.
Pre-Programmed Keypad Key
Press the key pre-programmed to toggle System Scan and the SYSC ON or
SYSC OFF display message is displayed for two seconds to show the new
state.
EMERGENCY OPERATION
The radio's ability to declare an emergency, clear an emergency, remain
locked on an emergency system and group, and the emergency audio and
display freeze can each be enabled or disabled through programming. When
an emergency is declared scanning will stop and restarts only after the
emergency has been cleared.