Mode Description
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 prevent-
ed.
Quick-Key Override Your radio must be preprogrammed to allow
you to use Quick-Key Override. This feature
works with either one of the two above varia-
tions. You can override the transmit-inhibit state
by quick-keying the radio (press PTT button
twice within the preprogrammed time limit).
2.24.12
Transmit Inhibit
This feature is available for APCO 25 trunking, Type II trunking and Conventional operations for all
APX radios.
When Transmit Inhibit feature is enabled, the radio stops all transmission including voice and data. The
radio can receive messages but is not able to reply the acknowledgment request of the received
message.
User can physically control the transmission of the radio especially during operation in hazardous
environments with this feature. An environment is considered hazardous when the power emitted by
the radio power amplifier could initiate an explosion or other dangerous reactions.
When the Transmit Inhibit feature is disabled, the radio functions according to its normal operations.
The radio sounds alert tone when user enters or exits this feature and also when PTT is pressed.
NOTICE: Acknowledgment of any messages required from the radio is not transmitted if the
Transmit Inhibition is enabled.
2.24.12.1
Enabling Transmit Inhibition
Procedure:
Perform one of the following actions.
• or to TxIn. Press the Menu Select button below TxIn.
• Turn off the ignition through Ignition Sense Line.
The display shows Tx inhibit on. You hear a sequence of short, low-high tones to indicate
transmission is inhibited.
Pressing PTT triggers the radio sounds a constant short, low-pitched tone (reject tone).
NOTICE: The status of the Transmit Inhibit does not change after the radio powers up.
The softkey TxIn is created to ease the user of inhibition transmission besides relying solely on
Ignition Sense Line. Only if the Ignition Sense Line is on, the softkey TxIn works. If the Ignition
Sense Line is on, user can always turn on or off the Transmit Inhibition using the softkey TxIn;
but when the Ignition Sense Line is off, function of softkey TxIn is suspended, and the
Transmit Inhibition function is always off.
If PTT TX Inhibit is enabled, when using multi control head with one active configuration, with the PTT
pressed on the active control head, any press on the programmable button of the other control head
6875946M01-JK
Advanced Features
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