Smart Ptt Feature (Conventional Only); Transmit Inhibit - Motorola APX 4000 User Manual

Smart PTT Feature (Conventional Only)

Smart PTT is a per-personality, programmable
feature used in conventional radio systems 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.
If you try to transmit on an active smart-PTT channel,
you hear an alert tone, and the transmission is
inhibited. The LED lights up solid yellow to indicate
that the channel is busy.
The following table shows the variations of smart
PTT:
Mode

Transmit Inhibit

on Busy
Channel with
Carrier
Transmit Inhibit
on Busy
Channel with
172
English
Description
You cannot transmit if any traffic
is detected on the channel.
You cannot transmit on an active
channel with a squelch code or (if
secure-equipped) encryption key
other than your own. If the PL
Mode Description
Wrong Squelch code is the same as yours, the
Code transmission is not prevented.
Quick-Key This feature can work in
Override conjunction with either of the two
above variations. You can
override the transmit-inhibit state
by quick-keying the radio. In
other words, two PTT button
presses within the
preprogrammed time limit.
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 could receive messages but not replying the
acknowledgement request of the received message.
User could 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