Yaesu FT-991A Operating Manual page 43
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Also See for FT-991A:
- Technical supplement (132 pages) ,
- Reference manual (21 pages) ,
- Instruction manual (15 pages)
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AMS ( Automatic Mode Select ) Operation
Using the AMS function switches the communication mode to match the received signal but you can alternatively
select and lock the transmission mode.
1. Press the MENU ( SETUP ) button to enter the
Menu mode.
2. Rotate the MULTI knob to select Menu item "090
AMS TX MODE".
3. Touch [ SELECT] on the LCD, rotate the MULTI
knob to select the desired operation ( see the fol-
lowing table ) .
Available
Settings
AUTO
TX/RX
The operating mode is automatically selected from the three communication modes to match the received signal.
MANUAL
TX/RX
The operating mode is automatically selected from three communication modes to match the received signal.
Pressing the Microphone PTT switch momentarily, toggles between the Digital ( C4FM ) and Analog ( FM )
communication modes.
DN
RX
The RX mode is automatically selected from the three communication modes to match the received signal.
TX
The TX mode is automatically changed to the "DN" mode.
VW
RX
The RX mode is automatically selected from the three communication modes to match the received signal.
TX
The TX mode is automatically changed to the "VW" mode.
ANALOG
RX
The RX mode is automatically selected from the three communication modes to match the received signal.
TX
The TX mode is automatically changed to the "FM" mode.
Without using the AMS function, you can select and lock the digital communication mode ( DN or VW ) .
1. Touch [ AMS] on the screen to set the AMS func-
tion to "OFF".
2. Touching [ DIGITAL] on the screen switches the
digital communication mode between the follow-
ing modes.
DN ( V/D Mode ) : As the audio signal error is de-
tected and repaired at the same time as the
transmission of the digital audio signal,
it becomes more difficult for conversa-
tions to be cut off. A basic digital mode of
C4FM FDMA.
FT- 991 Operating Manual
Convenience Features
Setting the Operation of the AMS Function
Explanation of Function
Toggling to the Digital Communication Mode
MENU ( SETUP ) Button
MULTI Knob
4. Touch [ ENTER ] on the LCD to save the new set-
ting.
5. Press the MENU ( SETUP ) button or touch
[ BACK ] on the LCD to exit to normal operation.
VW ( FR Mode ) : Digital voice data is transmit-
ted using the entire 12.5 kHz bandwidth.
High quality voice communication is pos-
sible.
Page 41
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