Vox (Ssb/Am/Fm Modes: Automatic Tx/Rx Switching Using Voice Control) - Yaesu FT dx 1200 Operating Manual

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Instead of using the microphone PTT switch or the front panel [ MOX ] 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 microphone.
1. Press the [ /// ] button to select the "VOX",
then press the [ SELECT ] button to select "ON".
The "VOX" 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, press
the [ SELECT ] button once more. The "VOX" 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 ] button to engage the Menu
mode.
3) Rotate the [ VFO-B/CLAR ] knob (or press the
 / button) to select Menu item "181 VOX
GAIN", then press the [ SELECT ] button .
4) While speaking into the microphone, rotate the
[ VFO-B/CLAR ] knob (or press the / button)
to the point where the transmitter is quickly ac-
tivated by your voice, without background noise
causing the transmitter to activate.
5) When you satisfied with the setting, press the
[ SELECT ] button, then press the [ MENU ] but-
ton to save the new setting and 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 ] button to engage the Menu
mode.
3) Rotate the [ VFO-B/CLAR ] knob (or press the
/ button) to select Menu item "182 VOX DE-
LAY", then press the [ SELECT ] button .
4) Rotate the [ VFO-B/CLAR ] knob while saying a
brief syllable like "Ah" and listening to the hang
time for the desired delay.
5) When you are satisfied with the setting, press
the [ SELECT ] button, then press the [ MENU ]
button to save the new setting and exit to normal
operation.
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  
 The Anti-Trip setting adjusts the level of negative re-
ceiver audio feedback to the microphone, to prevent
receiver audio from activating the transmitter (via
the microphone). This setting can also be adjusted
via Menu item "183 ANTI VOX GAIN".
 VOX operation may be engaged on either Voice
modes (SSB/AM/FM) or on AFSK-based Data
modes. Use Menu item "180 VOX SELECT" (the se-
lections are "MIC" and "DATA").
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] Button [ VFO-B/CLAR ] Knob
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
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