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
Description
Transmit Inhibit
on Busy Chan-
nel with Carrier
You cannot transmit if any traffic is
detected on the channel.
Transmit Inhibit
on Busy Chan-
nel 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 transmis-
sion is not prevented.
Mode
Description
Quick-Key Over-
ride
Your radio must be preprogram-
med to allow you to use Quick-Key
Override. This feature can work in
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 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.
English
101