Vox (Ssb/Am/Fm Modes: Automatic Tx/Rx Switching Using Voice Control) - Yaesu FT-991 Operating Manual

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Instead of using the microphone PTT switch or the [MOX] function (that may be displayed by pressing the F(M-LIST)
button) to activate the transmitter, the VOX (Voice Operated Transmit) system may be used for hands-free activation of
the transmitter, by the voice input to the microphone.
1. Press the F(M-LIST) button, to reveal the functions
list on the TFT LCD display, then touch [ VOX ] on
the LCD to activate the function, "ON" will appear
in the display.
2. Without pressing the PTT switch, speak into the
microphone in a normal voice level. When you start
speaking, the transmitter should be activated auto-
matically. When you finish speaking, the transceiver
should return to the receive mode (after a short de-
lay).
3. To cancel VOX and return to PTT operation, touch
[ VOX ] on the LCD once more. The "VOX" indica-
tion will turn OFF, signifying that the VOX circuitry
has been turned off.
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 The VOX Gain may be adjusted to prevent acciden-
tal transmitter activation in a noisy environment. To
adjust the VOX Gain:
1) Activate the VOX circuitry, if necessary.
2) Press the MENU(SETUP) button to engage the
Menu mode.
3) Rotate the MULTI knob to select Menu item "145
VOX GAIN", then touch [ SELECT ] on the LCD.
4) While speaking into the microphone, rotate the
MULTI knob to the point where the transmitter
is quickly activated by your voice, without back-
ground noise causing the transmitter to activate.
5) When you are satisfied with the setting, touch
[ ENTER ] on the TFT LCD display to save the
new setting.
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c
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 The "Hang-Time" of the VOX system (the transmit/
f
eatures
tx/rx S
Witching uSing
F(M-LIST) Button
MENU(SETUP) Button
MULTI Knob
6) Press the MENU(SETUP) button or touch
[ BACK ] on the LCD to exit to normal operation.
receive delay after the cessation of speech) may also
be adjusted via the Menu mode. The default delay is
500 msec. To set a different delay time:
1) Activate the VOX circuitry, if necessary.
2) Press the MENU(SETUP) button to engage the
Menu mode.
3) Rotate the MULTI knob to select Menu item "146
VOX DELAY", then touch [ SELECT ] on the
LCD.
4) Rotate the MULTI knob while saying a brief syl-
lable like "Ah" and listening to the hang time for
the desired delay.
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