96
BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER - ADVANCED OPERATION
Scanning
Scanning allows the transceiver to monitor several channels for incoming calls.
For example, a station calling a station that is in scanning mode can send a
Beacon Call on any channel knowing the station it is calling is monitoring all
its available channels. A response from the scanning station will only occur on
channels that are open for communication. It is particularly useful as the nature
of HF signal propagation means that not all channels are available for commu-
nications at one time.
Stations in scan can also monitor channels for voice activity or signals received
that have signal strengths over a preset level.
The transceiver will come out of scanning mode for the following reasons:
•
A Selcall is received.
•
Signal Strength Level (SSL) mute is selected and a signal with a level greater
than the pre-set threshold is received.
•
Audio (syllabic) mute is selected and a voice signal is detected.
The
Scan icon
on the Home screen,
once pressed, initiates scanning
according to the currently selected
scan table, see Scan Settings page
97. If no scan tables are available
a “No Scan Channels” error will be
shown.
Whilst scanning, several options on
the screen are hidden (Channels,
Hop and Tune) and the Scan icon is
animated.
Scan
To stop scanning, press
or the scan icon.
Pressing the Scan icon for longer than 1 second will bring up 1 of 3 possible
screens:
• The Scan Settings menu (see page 97) when ALE 2G or 3G are not ena-
bled.
• A list of the available ALE 2G Preset Maps when ALE 2G is enabled (See
Barrett ALE 2G and 3G User Guide (P/N BCM40524)).
• A list of the ALE 3G Pool entries (See Barrett ALE 2G and 3G User Guide
(P/N BCM40524)).