6

TK-480/481
OPERATING FEATURES
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.

3-3. 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.

3-4. 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.

3-5. 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.

■Selected + Talkback

If the system/group was changed while scanning, the
newly selected system/group. The transceiver “talks back”
on the current receive group.

3-6. Scan message 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. Nor-
mally, three data messages are monitored for each system,
and it can be increased in multiples of three data messages
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.

3-7. 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 always
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.

3-8. In Conventional system.

If QT or DQT is set for the channel, the channels, includ-
ing signalling, are scanned.
In case of the priority group is set in conventional sys-
tem, if a group scan (including group scan during a system
scan) temporarily stops (receiving) in a group that does not
have priority, a look back is performed to the priority group.
Look back is performed according to the look back time A
and B settings. If a call is received on the priority group, re-
ception immediately switches to the priority group.
4. Details of Features

4-1. Time-out timer

The time-out timer can be programmed in 15 seconds
increments from 15 seconds to ten minutes. If the transmit-
ter is keyed continuously for longer than the programmed
time, the transmitter is disabled and a warning tone sounds
while the PTT button is held down. The alert tone stops
when the PTT button is released.

4-2. Sub LCD

You can use 3-digit the display to display the system
number, channel number or group number. It is useful when
the main (12-digit) display indicates system, group or chan-
nel name or other functions.

4-3. Selective Call Alert LED

You can select whether or not the LED on the transceiver
flashes in an orange color when selective call was occurred.

4-4. PTT ID

PTT ID provides a DTMF ANI or MSK ID to be sent with
every time PTT (connect ID at beginning of transmission,
disconnect ID at end of transmission, or both).
You can program PTT ID “on” or “off” for each group
channel (DTMF). The contents of ID are programmed for
each transceiver.
The transceiver is capable to have ID. The format is
DTMF. The timing that the transceiver sends ID is program-
mable.
BOT : Connect ID is sent on beginning of transmission.
EOT : Disconnect ID is sent on end of transmission.
Both : Connect ID is sent on beginning of transmission
and disconnect ID is sent on end of transmission.
There is also “PTT ID” setting for each channel.