Yaesu FTA-310 Operating Manual

FTA-310 OperATing MAnuAl 19advanced operatIonMonitor SwitchWhen listening to a very weak signal from an aircraft orground station, you may observe the signal disappearingperiodically as the incoming signal strength becomes tooweak to override the squelch threshold setting.To disable the squelch temporarily, press and hold theMONITOR switch for 2seconds on the left side ofthe radio, just below thePTT switch. The squelchwill remain open and youshould have a better chanceof hearing weak signals.To return to normal operation, press the MONITORswitch momentarily.ANL (Automatic Noise Limiter) FeatureFor reduction of impulse noise, such as that produced byan engine’s ignition system, the ANL feature may provehelpful. The ANL feature is only activated in the AMmode. To activate the ANLf e a t u r e , p r e s s t h e[USER] key momen-tarily. The “ ” iconwill appear on the dis-play, and you shouldobserve a reduction in the ig-nition noise. To turn the ANL feature off,repeat the above step; the“ ” icon will disappear from the display.