Yaesu FTA-310 Operating Manual

FTA-310 OperATing MAnuAl16Accessing the 121.5 MHz Emergency FrequencyThe FTA-310 can quickly access the 121.500 MHzEmergency Frequency. This function can be activatedeven when the keypad lock function (described on page21) is in use. To access the Emer-gency Frequency, pressthe [121.5] key mo-mentarily. To exit the Emergency Fre-quency, press downwardon the VOLUME knob.Transmission To transmit, press and hold the PTT switch. Speakinto the microphonearea of the front panelgrille in a normal voicelevel. To return to the receivemode, release the PTTswitch.B asIc operatIonOperating Advice: Use of Internal MicrophoneYour FTA-310 is extensively sealed against water ingress, so as to ensure reliable op-eration even if it has become submerged. This unique construction includes waterproof-ing seals around the microphone and speaker enclosure, requiring that care be exercisedwhen speaking into the internal microphone.Please refer to the illustration, and observe the location of the internal microphone. It isimportant that you focus your speech in the direction of the microphone's location, so asto ensure sufficient voice input to the radio.If you find it difficult to utilize the FTA-310 conveniently and safe while speakingdirectly into the microphone, we recommend the use of the MH-44 B4B Speaker/Micro-phone (option), or an after-market aviation headset/boom microphone.