Yaesu VX-451 Operating Manual page 15

Rotate the VOL/PWR
knob to set the volume
level. If no signal is
present, press and hold in
the SIDE-1 button (un-
der the PTT switch)
more than 2 seconds;
background noise will
now be heard, and you
may use this to set the
VOL/PWR knob for the
desired audio level. Press
and hold the SIDE-1 button more than 2 seconds
(or press the SIDE-1 button twice) to quiet the
noise and resume normal (quiet) monitoring.
The Channel Announcement Feature works as described below
(1) In the VX-454/459 radio:
The maximum number of channels is 512 (32 channels maximum per group). The radio announces the
channel number digit by digit.
For example, "Channel 1" is announced as "one" and "Channel 10" is announced as "one zero".
(2) In the VX-451 radio:
The maximum number of channels is 32 (16 channels maximum per group). The radio announces
Channels 1 - 9 by digit, while Channels 10 - 16 are announced by number.
For example, "Channel 10" is announced as "ten" and so on.
VX-450 S O
O
M
To transmit, monitor the
channel and make sure it
is clear.
Press and hold the PTT
switch. Speak into the
microphone area of the
front panel grille in a normal voice level. To re-
turn to the Receive mode, release the PTT switch.
Press the (Orange) TOP
SEL key to activate one
of the preprogrammed
functions which may
have been enabled at the
time of programming by
the dealer. See the next section for details regard-
ing the available features.