Yaesu FT-991 Operating Manual

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

Contents

Page 95FT-991 O PERA T ING M ANUALThe FT-991 transceiver is capable of using 2, C4FM digital modes: the “V/D mode” which communicates voice anddata simultaneously, and the “Voice FR mode” which transmits digital voice data using the full 12.5 kHz bandwidth.1. Press the MODE button, and then touch the corre-sponding key on the LCD to select the C4FM operat-ing mode. The “C4FM” icon appears in the display.MODE Button2. Set the transceiver to the desired operating frequen-cy.A dvice :The VFO-A frequency can be changed by rotatingthe Main Tuning Dial knob or using one of the fol-lowing methods. For details, see page 42. Setting the frequency directly using the numberkeys. Setting the frequency by rotating the MULTIknob. Setting the frequency using the UP/DWN buttonson the microphone.3. Press and hold the PTT button on the microphone (ortouch the [MOX] on the LCD) to change the trans-ceiver to transmit mode, then speak into the micro-phone.Release the PTT button (or touch the [MOX] againif you pressed [MOX] to enter the transmit mode) tochange the transceiver back to the receive mode.A dvice : Digital communication mode can be switched be-tween V/D mode and FR mode (see “Toggling to theDigital Communication Mode” on page 39). The AMS (Automatic Mode Select) function enablesthe transceiver to select the appropriate communica-tion mode according to the received signal. Usingthe AMS function, the transceiver recognizes eitheranalog (FM) or C4FM digital signals and automati-cally changes to the same communication mode asthe contact station.note: When communicating in V/D mode (“DN” is dis-played on the LCD), the station location informationis contained within the transmitted digital signal. InVoice FR mode (“VW” is displayed on the LCD), thelocation information is not included in the transmit-ted signals.c4fM M oDe (D iGital M oDe ) operation