E F Johnson Company 2425770 사용자 설명서
Viking Portable 600 Radio Operating Manual
5-13
Conventional Mode Features
Talkgroup on Selected Scan - Monitors a single digital conventional channel. When a
call is received, the radio searches the scan list for a talkgroup that matches the received
talkgroup. Always returns calls on the talkgroup from the selected channel.
call is received, the radio searches the scan list for a talkgroup that matches the received
talkgroup. Always returns calls on the talkgroup from the selected channel.
5.10.3 Priority Channel Sampling
The following describes priority sampling when scanning conventional channels.
Note
Priority sampling when scanning SmartNet/SmartZone/P25 Trunked channels is
described in Section 6.10.
described in Section 6.10.
The priority channel sampling feature ensures that when priority scanning, messages on
the priority channel are not missed while listening to a message on some other channel.
The radio can be programmed as just described so that the priority channel is a fixed
channel programmed in the current scan list, the currently selected channel, or not used.
the priority channel are not missed while listening to a message on some other channel.
The radio can be programmed as just described so that the priority channel is a fixed
channel programmed in the current scan list, the currently selected channel, or not used.
Note
Priority channel sampling is not available when receiving analog encrypted (DES) calls,
nor when receiving unit calls. In addition, the priority channel is not scanned if the active
channel is an analog channel on the same frequency as the priority channel and is
programmed with CTCSS/DCS squelch control.
nor when receiving unit calls. In addition, the priority channel is not scanned if the active
channel is an analog channel on the same frequency as the priority channel and is
programmed with CTCSS/DCS squelch control.
Either a single or dual priority channels can be programmed if desired. With dual priority,
a call on the second priority channel is interrupted by a call on the first priority channel but
not vice versa. When scanning and the selected channel is a single or first priority channel,
a call on the second priority channel is interrupted by a call on the first priority channel but
not vice versa. When scanning and the selected channel is a single or first priority channel,
is indicated in the display. This indication is displayed regardless of whether the
priority channel is fixed or always the selected channel. When it is a second priority
channel,
channel,
is displayed.
The priority channel sampling frequency is determined by the programmed Priority
Lookback Time A (see description which follows). For example, if 2.0 seconds is
programmed, the priority channel is sampled every 2.0 seconds when listening to a
message on a non-priority channel. When not listening to a message, the priority channels
are scanned in the normal scan sequence. With dual priority, the first and second priority
channels are alternately sampled at the Lookback Time.
Lookback Time A (see description which follows). For example, if 2.0 seconds is
programmed, the priority channel is sampled every 2.0 seconds when listening to a
message on a non-priority channel. When not listening to a message, the priority channels
are scanned in the normal scan sequence. With dual priority, the first and second priority
channels are alternately sampled at the Lookback Time.
Priority channel sampling occurs only with conventional priority scanning. It does not
occur with radio wide scanning, when listening to any type of SmartNet/SmartZone/P25
trunked call, encrypted call, or when transmitting (see preceding note). A series of “ticks”
may be heard when the priority channel is sampled while listening to a message on some
other conventional channel.
occur with radio wide scanning, when listening to any type of SmartNet/SmartZone/P25
trunked call, encrypted call, or when transmitting (see preceding note). A series of “ticks”
may be heard when the priority channel is sampled while listening to a message on some
other conventional channel.
The priority sampling times are set by programming.
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Preliminary Draft 3/9/12