Yaesu VX-451 Operating Manual page 16

If a Speaker/Microphone
is available, remove the
plastic cap and its two
mounting screws from
the right side of the trans-
ceiver, then align the con-
nector of the Speaker/
Microphone on the trans-
ceiver body; secure the
connector pin using the screws supplied with the
Speaker/Microphone. Hold the speaker grille up
next to your ear while receiving. To transmit, press
the PTT switch on the Speaker/Microphone, just
as you would on the main transceiver's body, and
speak into the microphone on a normal voice level.
Note 1): Save the original plastic cap and its
mounting screws. They should be reinstalled
when not using the Speaker/Microphone.
2) When you press the PTT switch on the
Speaker/Microphone, it disables the internal mi-
crophone, and vice versa.
O
If the Busy Channel Lockout feature has been
programmed on a channel, the radio will not trans-
mit when a carrier is present. Instead, the radio
will generate short beep three times and indicate
CH BUSY
"
459). Release the PTT switch and wait for the
channel to be clear of activity.
If CTCSS or Digital Coded Squelch (DCS) Lock-
out has been programmed on a channel, the radio
can transmit only when there is no carrier being
received or when the carrier being received in-
cludes the correct CTCSS tone or DCS code.
Automatic Time-Out Timer
If the selected channel has been programmed for au-
tomatic time-out, you must limit the length of each
transmission. While transmitting, a beep will sound
10 seconds before time-out. Another beep will sound
just before the deadline; the "TX" indicator will dis-
appear and transmission will cease soon thereafter.
To resume transmitting, you must release the PTT
switch and wait for the "penalty timer" to expire.
VX-450 S
" on the display (VX-454 and VX-
O M