Yaesu FT-991 Operating Manual

Also see for FT-991: Manual Manual Operating manual Reference book Instruction manual

Contents

Page 18FT-991 O PERA T I N G M A N U A LON/OFF SwitchPress and hold in this switch for one second to turnthe transceiver on. Similarly, press and hold in thisswitch for one second to turn the transceiver off.m Connect the FT-991 transceiver to a commercial-ly available DC power supply. Turn the DC sup-ply on to place the transceiver in standby mode.The transceiver must be in standby mode to turnit on using the ON/OFF switch. For details onhow to connect a commercially available DCpower supply, see page 13.m Press the ON/OFF switch briefly while the pow-er is on, the receiver audio from the speaker willbe muted for about 3 seconds (Mute function).KEY JackConnect a telegraph key or electronic keyer paddleto use for CW mode operation.KEYKEYNC GNDGNDWhen connecting a single straight keyDOT DASH COMMONDOT DASH COMMONWhen connecting an electronic keyer paddlem When connecting a key or other device to theKEY jack, use only a 3-contact (“stereo”) 1/4”phone plug; a 2-contact plug will place a shortbetween the ring and the (grounded) shaft of theplug, resulting in a constant “key-down” condi-tion.m Key-up voltage is +3.3 V, and key-down currentis about 4 mA.note:A 2-contact plug cannot be used in this jack.PHONES JackConnect headphones to this ϕ3.5 standard stereojack.m Inserting a headphone plug into this jack will de-activate the internal and external speakers.note:When wearing headphones, we recommend that youturn the AF Gain levels down to their lowest settingsbefore turning power on, to minimize the impact onyour hearing caused by audio “pops” during switch-on.MIC JackThis 8-pin jack accepts input from a microphone uti-lizing a traditional YAESU HF transceiver pinout. DOWN UP +5V MIC GND MIC PTT GND FASTfront panel controls & switches432157896