Page 72
FT-
991
Operating Manual
Transmitter Convenience Features
VOX
(
SSB/AM/FM Modes:
Automatic TX/RX Switching using Voice Control
)
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.
MULTI Knob
MENU(SETUP) Button
F(M-LIST) Button
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.
Advice:
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 “
143
VOX GAIN
”, then touch [
SELECT
] on the LCD.
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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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4) Rotate the
MULTI
knob while saying a brief syl-
lable like “Ah” and listening to the hang time for
the desired delay.
6) Press the
MENU(SETUP)
button or touch
[
BACK
] on the LCD to exit to normal operation.
The “Hang-Time” of the VOX system (the transmit/
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 “
144
VOX DELAY
”, then touch [
SELECT
] on the
LCD.
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