Kenwood TK-3160E - Discontinued - Manual (Page 30)

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QUIET TALK (QT)/ DIGITAL QUIET TALK (DQT)
Your dealer may have programmed QT or DQT signalling on
your transceiver channels. A QT tone/DQT code is a sub-
audible tone/code which allows you to ignore (not hear) calls
from other parties who are using the same channel.
When a channel is set up with a QT tone or DQT code,
squelch will only open when a call containing a matching tone
or code is received. Likewise, signals that you transmit will
only be heard by parties whose QT/DQT signalling matches
your transceiver.
If a call containing a different tone or code is made on the
same channel you are using, squelch will not open and you
will not hear the call. This allows you to ignore (not hear)
these calls. Although it may seem like you have your own
private channel while using QT/DQT, other parties can still
hear your calls if they set up their transceiver with the same
tone or code.