| 9958 | Squelch activating frequency | 
| 
 | Setting range:  | 
| 9959 | Sets squelch opening frequency when  | 
| 
 | 0: No change (frequency set on 9958) | 
| 
 | 1: 1300 Hz | 
| 
 | Factory setting 1: 1300 Hz (Loudspeaker reproduces an audio with an input at | 
| 
 | 1300 Hz as the squelch opens at that frequency.) | 
| 9999 | This is for frequency programming by service technicians. Needs a password to | 
| 
 | open. | 
NOTE:
FURUNO Electric Company will assume no responsibility for the inconvenience or disturbance to communications due to inadequate or unlawful presetting of this equipment.