Icom UT-111 Instruction Manual page 12

2 * OPERATING MODES
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Originating a Dispatch Call
To originate a Dispatch Call, first select the desired System and Group ID
if applicable. Then press the PTT Switch to transmit. After the Clear to
Talk tone is heard, the user may proceed to talk. The Clear to Talk tone is
a short high frequency tone. The Clear to Talk tone indicates when a
successful connection has been established with the trunking system.
Release the PTT Switch at the completion of the message, and listen for
a response.
If all trunking channel are busy during a call origination, a busy tone will
be immediately heard when the PTT Switch is pressed. The user must
then release the PTT switch, and try again in a few moments.
If the transceiver is out of range of the trunking system, the busy tone will
be generated a few seconds after the PTT Switch is pressed. The user
must then release the PTT Switch, and move to a location that is within
range of the trunking system.
Receiving a Dispatch Call
To receive a Dispatch Call, first select the desired System and Group ID
if applicable. When an incoming message is received, the user may press
the PTT Switch to respond to the message. After the PTT Switch is
pressed, wait for the Clear to Talk tone, then proceed to talk. Release the
PTT Switch at the completion of the message, and listen for a response.
Busy Channel Lockout
Anytime the transceiver is receiving a signal on a selected group in the
trunking mode, the transmitter will be automatically locked out, and
inhibited from transmitting. This prevents multiple users in the same
group from transmitting at the same time, and reduces missed messages.
If a user attempts to transmit while receiving a signal from the selected
group, a single low beep tone will be heard immediately when the PTT
switch is pressed.