Yaesu VX-451 Operating Manual page 22

VOX S
You can manually adjust the VOX Gain using this
function:
Press (or press and hold) the assigned programmable
key. A tone will sound, and the current VOX Gain
level will appear on the display.
Press the [ A ] / [ B ] button to select the desired VOX
Gain level.
Press the [ D ] key to store the new setting. The dis-
play indicates "- SET -" briefly, then reverts to the
normal channel indication.
You may cancel the new setting by pressing the [ C ]
key. In this case, the display indicates "- CANCEL -"
briefly.
C V
Press (or press and hold) the assigned programmable
key to activate the Clear Voice feature. When you
are operating in a noisy environment, activate the
Clear Voice feature. Again press (or press and hold)
the assigned programmable key to disable the Clear
Voice feature.
A O
AF M V
Press (or press and hold) the assigned Programmable
key to reduce the audio output to the (lower) level
programmed by your Dealer.
E
The VX-450 series include an "Emergency" feature
which may be useful for alerting another party moni-
toring on the same frequency as your transceiver's
channel.
Press the assigned Programmable key to initiate an
emergency call. For further details contact your
Dealer.
L
Press (or press and hold) the assigned Programmable
key to toggle the Lone Worker feature "On" and
"Off".
The Lone Worker feature is designed to emit an alarm
for 30 seconds when the Lone Worker Timer (pro-
grammed by your Dealer) has expired. If the user
does not reset the timer by pressing the PTT switch,
the radio switches to the Emergency mode.
W
VX-450 S O M