Motorola H01UCC6DU3AN - Manual (Page 23)

22 Basic Operation
an active channel. Three radio-wide variations of smart PTT are
available:
1. Transmit Inhibit on Busy Channel: With this feature enabled,
you will be inhibited from transmitting if any activity is
detected on the channel.
2. Transmit Inhibit on Busy Channel with Wrong Squelch Code:
With this feature enabled, you will be inhibited from
transmitting on an active channel with a squelch code other
than your own. If the squelch code is the same as yours, the
transmission will not be inhibited.
3. Quick-Key Override: This feature can work in conjunction
with variation one or two. With this feature enabled, you will
be able to override the transmit inhibit state by quick-keying
(two PTT activations within one second of each other) the
radio.
Smart PTT radio operation is exactly the same as standard radio op-
eration, except that if you try to transmit (press PTT) on a Smart
PTT channel, a continuous alert tone is generated until the PTT is
released; the transmission is inhibited.