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FT-450 O
PERATION
M
ANUAL
A
UTOMATIC
TX/RX S
WITCHING
USING
V
OICE
C
ONTROL
(
VOX
)
Instead of using the microphone’s PTT switch to activate the transmitter, the VOX (Voice Operated TX/RX
Control) system provides hands-free, automatic activation of the transmitter, based on voice input into the mi-
crophone. Setup of the VOX system takes only a few seconds.
SSB/AM M
ODE
T
RANSMISSION
1. Press the [
F
] button followed by the [
VOX/STO
]
button to engage the VOX operation.
The “
” icon 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 automatically. When you finish
speaking, the transceiver should return to the
receive mode (after a short delay).
3. To exit from VOX operation, press the [
F
] button
followed by the [
VOX/STO
] button again.
[
HOME/RCL
] button
[
F
] button
[
DSP/SEL
] knob
[
VOX/STO
] button
[
F
] button
VOX G
AIN
A
DJUSTMENT
Adjust the VOX gain level to prevent accidental transmitter activation in a noisy environment.
1. Press and hold the [
F
] button for one second to
enter the Menu mode. The “
” icon will ap-
pear on the display.
2. Rotate the [
DSP/SEL
] knob to select the menu
item “
VOXGAIN
”.
3. Press the [
DSP/SEL
] knob to enable adjustment of
this menu item. The “
” icon will be blinking.
4. Rotate the [
DSP/SEL
] knob to set to the point
where the transmitter is quickly activated by your
voice, without causing background noise to acti-
vate the transmitter. Available selections are 1
through 100 (factory default: 50).
Press the [
HOME/RCL
] button to reset the VOX
gain level to the factory default.
VOX D
ELAY
A
DJUSTMENT
(
THE
TRANSMIT
-
RECEIVE
DELAY
AFTER
THE
CESSATION
OF
SPEECH
)
1. Press and hold the [
F
] button for one second to
enter the Menu mode. The “
” icon will ap-
pear on the display.
2. Rotate the [
DSP/SEL
] knob to select the menu
item “
EXT MNU
”.
3. Press the [
DSP/SEL
] knob to enable adjustment of
this menu item. The “
” icon will be blinking.
4. Rotate the [
DSP/SEL
] knob to select “
ON
” to ex-
pand the menu items.
5. Press the [
DSP/SEL
] knob. The “
” icon re-
turns to appear continuously.
6. Press and hold the [
F
] button for one second to save
the new setting and return to normal operation.
7. Press and hold the [
F
] button for one second to
enter the Menu mode again. The “
” icon
will appear on the display.
8. Rotate the [
DSP/SEL
] knob to select the menu
item “
VOX DLY
”.
9. Press the [
DSP/SEL
] knob to enable adjustment of
this menu item. The “
” icon will be blinking.
5. Press the [
DSP/SEL
] knob. The “
” icon re-
turns to appear continuously.
6. Press and hold the [
F
] button for one second to save
the new setting and return to normal operation.
10. Rotate the [
DSP/SEL
] knob while saying a brief
syllable like “Ah” and listening to the hang time,
so as to set the desired delay. Available selec-
tions are 100 through 3000 msec (factory default:
500 msec).
Press the [
HOME/RCL
] button to reset the VOX
delay time to the factory default.
11. Press the [
DSP/SEL
] knob. The “
”” icon
returns to appear continuously.
12. Press and hold the [
F
] button for one second to save
the new setting and return to normal operation.
[
HOME/RCL
] button
[
F
] button
[
DSP/SEL
] knob
