Kenwood TK-2312E - Manual (Page 38)

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BUSY CHANNEL LOCKOUT (BCL)
If BCL is set up by your dealer, you will be unable to transmit if
the channel is already in use. Use a different channel or wait
until the channel becomes free.
COMPANDER
If programmed by your dealer for a channel, the compander
will remove excessive noise from transmitted signals, to
provide higher clarity of signals.
PTT ID
PTT ID is the transceiver unique ID code which is sent each
time the PTT switch is pressed and/or released.