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MM101332V1, Rev. K
11.2.2 Priority System Scan
The radio can also be programmed for Priority System Scan. 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. This is done at a
programmable rate defined by the value in the Priority Scan Time control (unless the ProScan
™
algorithm
is enabled, as explained in the following sections). This priority scan timer is reset each time the PTT
button is pressed or when the call is received. If the priority system control channel is found, (or meets the
predefined criteria <ProScan>), the radio will automatically switch to the priority system.
11.2.2.1 Enabling the Wide Area System Scan Function
If the radio cannot find the control channel of the selected system and begins to wide area system scan,
the radio will only scan for the priority system control channel if the priority system is in the wide area
scan list.
11.2.2.2 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.
11.2.3 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.
11.2.4 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.
11.2.5 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.
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