7.24.11
Smart PTT (Conventional Only)
Smart PTT is a per-personality, programmable feature used to keep radio users from talking over
other radio conversations. When Smart PTT is enabled in your radio, you cannot transmit on an active
channel.
The following table shows the variations of Smart PTT.
Mode Description
Transmit Inhibit on Busy Channel with Carrier You cannot transmit if traffic is detected on the
channel.
Transmit Inhibit on Busy Channel with Wrong
Squelch Code
You cannot transmit on an active channel with a
squelch code or (if secure-equipped) encryption
key other than your own. If the PL code is the
same as yours, the transmission is not preven-
ted.
Quick-Key Override Your radio must be programmed to allow you
to use Quick-Key Override. This feature works
with either one of the two above variations. You
can override the transmit-inhibit state by quick-
keying the radio (press PTT button twice within
the programmed time limit).
7.24.12
Transmit Inhibit
The Transmit Inhibit feature allows you to stop all transmission including voice and data. The radio can
receive messages but is not able to reply the acknowledgment request of the received message.
This feature is available for APCO 25 Trunking, Type II Trunking, and Conventional operations for all
APX radios.
You can physically control the transmission of the radio especially during operation in hazardous
environments. An environment is considered hazardous if radio transmission could initiate an explosion
or other dangerous reactions.
7.24.12.1
Enabling Transmit Inhibition
Procedure:
1 Press the Transmit Inhibit programmable button.
NOTE: If the user has disabled TX Inhibit using the menu and then moves the switch to
the position where TX Inhibit is enabled, the new value overwrites the menu value.
The display shows Tx inhibit on. You hear a sequence of short, low‐high tones to indicate
that transmission is inhibited.
Pressing PTT triggers the radio sounds a constant short, low‐pitched tone (reject tone).
NOTE: The status of the Transmit Inhibit does not change after the radio powers up.
MN002667A01-AV
Chapter 7 : Advanced Features
75
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