Icom UT-111 Instruction Manual page 8

1 * Operation
heard. When Group 0 (Group Scan) is selected, a high beep
tone is generated. The last selected Group ID is always
selected on power up, or when a Channel Bank change has
occurred.
Please refer to the radio transceiver's programming soft-
ware for the Trunking Group SW assignment.
Receive Only Groups ID
A Group ID can be programmed such that the receiver will
decode the Group ID, but transmission on that group is dis-
abled. If transmission is attempted on a Receive Only Group,
the transceiver will immediately generate a single low beep
tone when the user presses the PTT Switch. This feature is
programmed by the radio dealer.
Group Scan ID
Group Scan allows the user to scan all selectable Group ID
codes contained within the selected system. Group Scan is
selected by pressing the Trunking Group SW until the group
number '#0' is shown in the LCD display. Upon detection of
a Group Code, the transceiver will stop scanning, pass re-
ceive audio, and display the decoded Group ID, #1, #2, #3,
«+. #10, on the LCD display. Note on some transceivers, a
decoded Group ID may be displayed using a different dis-
play character. Once the group number is displayed, the user
may also transmit on the displayed group. If no group num-
ber is displayed during scanning, transmission is inhibited
until a valid Group ID is decoded. The transceiver will gen-
erate a busy tone immediately when the PTT Switch is pressed
if transmission is inhibited.
To prevent switching to another Group ID while in the Group
Scan mode, the Scan Resume timer locks in the currently de-
coded Group ID fora duration from | to 35 seconds. The Scan
Resume timer is reloaded each time the currently decoded
Group ID is detected. In addition, any time the user presses the
PTT Switch, the Scan Resume timer will be re-loaded. This
ensures that the response to your transmission is received be-
fore Group Scan is resumed. When the Scan Resume timer
expires, scanning of all programmed Group IDs in the selected
system will continue. Transmission after the Scan Resume
timer expires will still be on the previous displayed group pro-
vided no other Group ID has been detected.