Operation Manual

Page 39FT-450 OPERATION MANUAL
AUTOMATIC TX/RX SWITCHING USING VOICE CONTROL
(
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 MODE TRANSMISSION
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 GAIN ADJUSTMENT
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 DELAY ADJUSTMENT
(
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