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12.5.2 ProScan
The radio can be programmed for ProScan™ system scan operation for multi-site applications
depending on the version of radio flash code. 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 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 ProScan algorithm is based on a
combination of both Received Signal Strength Indicator [RSSI] and Control Channel Verification
[CCV] 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.
12.5.3 Priority System Scan
The radio can also be programmed for Priority System Scan. (To ensure that this feature operates
correctly, the control channel of the priority system must be located on channel one unless you are
using the ProScan algorithm.) The priority system is the desired or preferred system. While
receiving the control channel of the selected system, the radio will periodically leave the selected
system and search for the control channel of the priority system at a programmable rate. The
programmable rate is defined by the value in the Priority Scan Time control, (unless the
ProSound/ProScan algorithm is enabled as explained below). This priority scan timer is reset each
time the PTT button is pressed or when a call is received. If the priority system control channel is
found, or meets the predefined ProScan criteria, the radio will automatically switch to the priority
system.
12.5.4 When Wide Area System Scan Is Enabled
If the radio cannot find the control channel of the selected system and begins Wide Area System
Scan (WA Scan), the radio will only scan for the priority system control channel if the priority
system is in the WA Scan list.
12.5.5 When ProScan Is Enabled
The radio monitors the priority system and will switch to the priority system if the priority system
meets the criteria defined in the “ProSound/ProScan Options” dialog box. If ProScan is enabled,
the rate at which the radio will scan for the priority system is defined by the System Sample Time
control.
12.5.6 Menu Selection
Press M and then use the RAMP controls, , and ., to scroll through the selections until
SYS SCAN is displayed. Then press M to toggle the System Scan state. The SYSC ON or
SYSC OFF display message is displayed for two seconds to show the new state.
12.5.7 Pre-Programmed Keypad Key
Press the pre-programmed key and the SYSC ON or SYSC OFF display message is displayed
for two seconds to show the new state.