Page 20FT-991 O PERA T ING M ANUALdisplaY indiCaTionsLED IndicatorsRX IndicatorThis indicator illuminates when the squelch opens.TX IndicatorThis indicator illuminates during transmission.Memory Mode RX/TX IndicatorsGreen (Left):This indicator illuminates when the receiver is ac-tive on the memory channel.Red (Right):This indicator illuminates when the transmitter isactive on the memory channel.Main Band RX/TX IndicatorsGreen (Left):This indicator illuminates when the receiver is ac-tive on the main band (VFO-A).Red (Right):This indicator illuminates when the transmitter isactive on the main band (VFO-A).Sub Band RX/TX IndicatorsGreen (Left):This indicator illuminates when the receiver is ac-tive on the main band (VFO-B).Red (Right):This indicator illuminates when the transmitter isactive on the main band (VFO-B).FAST/LOCK IndicatorsFAST:This indicator appears when the Main Tuning Dialknob tuning rate is set to “fast”.LOCK:This indicator appears when the Main Tuning Dialknob is locked.