Page 27FT-991 O PERA T I N G M A N U A LMh-31a8J M icrophone switchesPTT SwitchSwitches transmission/reception.Press to transmit and release to receive.DWN ButtonPress the DWN (Down) button to scan the frequencydownward.FST ButtonAllows switching the frequency variation (step),working in the same way as the FAST button on thetransceiver front panel.UP ButtonPress the UP button to scan the frequency upward.MicrophoneSpeak into the microphone in a normal tone of voicewith the microphone 5 cm away from the mouth.TONE SwitchSwitches transmission sound quality.Slide to the “1” side to make the transmit audio flat.Slide to the “2” side to emphasize transmit audio.432156
