Tyco Electronics MM23772 Manuale Utente

67 

The radio can be programmed with the following System Scan features. These features are automatically 
enabled when the radio is powered ON. A key or menu option is also defined to allow the System Scan 
features to be toggled during radio operation. The System Scan state will be maintained through system 
changes but will default to ON when the radio is powered ON. 

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. 

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. 

The P7200 series radio can be programmed for Wide Area System Scan operation for roaming across 
mobile systems. 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. 

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. 

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. 

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. See Section 8.21.3 for more information on 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