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5.2
Description of Functions
5.2.1 Priority
Priority Scan allows you to check the presence of
Signals on the Priority Channels by adding them to
the Scan List.
The Look Back operation activates when receiving a
call on a normal Channel during Priority Scan.
You can operate Priority Scan by selecting "Fixed" or
"Selected" in Priority Scan.
Fixed Priority Scan
The transceiver scans the preset Channel as the
Priority Channel.
Selected Priority Scan
The transceiver scans the Selected Channel as
the Priority Channel. You cannot select the
Selected Priority Channel using the FPU.
5.2.2 Priority Group/Channel
You can select a Group/Channel for executing Fixed
Priority Scan.
5.2.3 Look Back
This function allows you to check the presence of a
signal on the Priority Channel while receiving a call
on a normal Channel during Priority Scan.
This function routinely monitors calls from Priority
Groups. Look Back Time A is used when no signals
are present and Look Back Time B is used when
there is a Carrier with unmatched signalling on the
Priority Channel.
Look Back Time A
This is the time period for monitoring the Priority
Channel during Priority Scan when no signals are
present. Look back Time A must be shorter than
Look Back Time B as the transceiver may receive
a signal on the Priority Channel. The transceiver
executes the scan smoothly when there is no
Carrier signal on the Priority Channel. The
transceiver receives signals on normal Channels
even if Look Back Time A is shorter than Look
Back Time B.
Look Back Time B
This is the time period for monitoring the Priority
Channel when a carrier does not match the
programmed QT/DQT during Priority Scan.
Other stations may be using the same frequency
as the Priority Channel therefore Look back Time
B must be longer than Look Back Time. A as the
transceiver may not receive a call from the Priority
Channel immediately.
The Priority Channel stand-by time becomes
longer as the transceiver checks the QT/DQT
when there is a Carrier signal on the Priority
Channel. In this case, the user may not hear the
receiving signal immediately. You can set a
relatively long time for Look Back Time B using the
FPU.
Priority Scan operation
The transceiver monitors signals in the following
sequence: Priority CH -> Normal CH -> Priority
CH -> Normal CH -> Priority CH ->...
Example
CH1 = Priority CH
CH2 (ADD)
CH3 (DEL)
CH4 (Not stored)
CH5 (ADD)
CH1(P) CH2(N) CH1(P) CH5(N) CH1(P) CH2(N)
The transceiver receives a signal on a normal
Channel and pauses Scan (Priority CH = Not
Busy).
Example: Scan pauses on CH 5.
CH5(N)
Look Back Time A
The transceiver receives a signal on a Normal
Channel and pauses the scan (Priority CH = Busy,
QT/DQT = Unmatched).
CH5(N)
CH1(P)
Look Back Time B
Note: The normal Channel is displayed even if the
transceiver executes the Look Back function after Scan
pauses on that Channel.
Note: The transceiver receives a call and moves to the
Priority Channel when receiving a Carrier signal and
QT/DQT while the Look Back function is operating.
5.2.4 Revert Channel
The Revert Channel is the Group/Channel that is
used for transmitting while pressing the PTT switch
during Scan.
There are four types of Revert Channels: Selected,
Selected + Talkback, Priority and Priority + TalkBack.
Selected
You can transmit using the selected
Group/Channel (selected Channel).
Selected + TalkBack
5 Scan Information
CH1(P)
CH5(N)
CH1(P)
Look Back Time A
CH5(N)
CH1(P)
Look Back Time B
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