From Mark's Scanner's:
Easier to Read Pro-106/197/PSR500/600 Digital Scanner Manual
In the global menu:
LCD BlinkOff: For alternating text displays, sets the display time for the secondary display element. (object number, channel name, ID name/number, search name)
Enter the amount of time, 1 - 250 x10 ms (10 - 2500 ms), the secondary element will display. Enter 1 for 'off'.
LCD BlinkOn: For alternating text displays, sets the display time for the primary display element. (system name, scan status, Scan List name)
Enter the amount of time, 1 - 250 x10 ms (10 - 2500 ms), the primary element will display. Enter 1 for 'off'.