6
TK-980/981
3. Scan Operating
■
System Scan
System scan can be selected with the “Scan” key by pro-
gramming the scan feature. When the “Scan” key is
pressed and the “SCN” mark appears, scan mode in en-
tered. Scanning starts from the system following the cur-
rently displayed system. When a call is received, scanning
stops, and the system and group are displayed.
When programming key is touched during scanning, the
scan stops and the revert system or group can be changed.
Scanning resumes one second after the key is released.
There are two types of system scan.
• Fix System Scan
All the set systems except locked-out ones are scanned.
If the Del/Add feature is assigned to the programmable key,
it can be controlled from the front panel.
• List Type System Scan
A scan list can be set for each system.
The list to be scanned can be changed by changing the
display system.
If many systems have been set, the scan speed can be
increased by narrowing the systems to be scanned with
scan lists.
■
System Lockout
The system lockout feature is used to lock systems out
of the scan sequence, and can be selected by programming
in the following two ways;
• Fixed Lockout
The system to be locked out is selected by programming.
When a locked system is selected, the Delete ( ) indicator
appears on the left of the SYSTEM indicator. The revert sys-
tem is scanned even if it is locked out. If there is a locked
system, the Delete ( ) indicator flashes during fixed scan-
ning.
• User Selectable Lockout
If the scan lockout feature is programmed to a key, the
user can lock systems out of the scan sequence with the
key. To lock a system out of the scan sequence, press the
key when the system is displayed. The Delete ( ) indicator
is displayed on the left of the SYSTEM indicator.
To unlock a system, select the system and press the key.
The Delete ( ) indicator disappears to indicate that the sys-
tem has returned to the scan sequence. The revert system
is scanned even if it is locked out. If there a locked system,
the Delete ( ) indicator flashes during fixed scanning. If all
systems are locked out, the scan stops and only the revert
system is received.
■
Drop-out Delay Time (Scan Resume Time)
If a call is received during scan, the scan stops. The scan
resume time can be programmed as 0 to 300 seconds in
one-second increments. The default value is 3 seconds.
OPERATING FEATURES
■
Dwell Time
The dwell time is the time after transmission ends until
the scan resumes in scan mode. It can be set 0 to 300 sec-
onds by programming. The default value is 3 seconds.
■
System/Group Revert
System/group revert can be programmed for one of the
following;
• Last Called Revert
The system or group changes to the revert system or
group when a call is received with the system or group be-
ing scanned.
• Last Used Revert
If a system/group call is received during scanning and the
PTT button is pressed for transmission and response within
the drop out delay time, the system or group is assigned as
the new revert system or group.
• Selected Revert
If the system/group was changed while scanning, the
newly selected system/group.
• Se Talkback Revert
If the system/group was changed while scanning, the
newly selected system/group. The transceiver “talks back”
on the current receive group.
■
Scan Massage Wait
The time for staying with the home repeater that re-
ceives a signal during system scan and monitoring data
messages can be programmed. If there is no signal from
the home repeater, the system is scanned for about 50ms.
If there is a signal, three data messages are monitored.
Normally, three data messages are monitored for each sys-
tem, and it can be increased in multiples of three data mes-
sages per line to up to eight lines.
If the repeater data message indicates that there is no
call, data monitoring is terminated and the home repeater of
the next system is scanned.
■
Group Scan Operation
Group scan can be programmed for each group. In addi-
tion to the ID codes of the selected group, the ID codes of
the other groups that are permitted for group scan are de-
coded. (The two fixed ID and block decode codes are al-
ways decoded.)
If, during group scanning, a call is received with one of
the selectable group ID codes for which group scan is en-
abled, the group display indicates the group number that the
call came in with. That group then becomes the new se-
lected group. Group scan resumes after the specified drop-
out delay time or dwell time shared by the system scan
elapses.
