Key Lock - Vertex Standard VX-4600CB Operating Manual

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 If the Busy Channel Lockout feature has been programmed on a channel, the
radio will not transmit when a carrier is present. Instead, the radio will gener-
ate a short beep three times and the VX-4600CB indicates "CH BUSY" on
the display. Release the PTT switch and wait for the channel to be clear of
activity.
 If CTCSS or Digital Coded Squelch (DCS) Lockout has been programmed on
a channel, the radio can transmit only when there is no carrier being received
or when the carrier being received includes the correct CTCSS tone or DCS
code.

Key Lock

In order to prevent accidental operating function/feature change or inadvertent
transmission, various aspects of the front panel's keys may be locked out.
To activate the Locking feature, press and hold in the [ P1 ] key while turning the
radio on. To disable the Locking feature, repeat this power-on procedure.
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