Scanning
Scanning allows the telephone interconnect to monitor several channels for
incoming calls. It is particularly useful as the nature of HF signal propagation means
that not all channels are available for communications at one time. For instance, a
station calling an interconnect that is scanning can send a “Beacon Call” on any
channel knowing the interconnect it is calling is monitoring all its available channels.
A response from the scanning interconnect will only occur on channels that are
“open” for communication.
Scanning is also essential for systems that are using ALE. ALE requires continuous
frequency quality analysis for the network to operate at its optimum. This is done by
using “Sounding” calls at set intervals on each ALE channel as set up in the
transceiver.
Selcall Scanning
When a Selcall signal is detected, no matter which mute type is selected the
transceiver will stop scanning and decode the Selcall. The interconnect will only
stop scanning when a Selcall is detected.
ALE / Selcall Scanning
When an ALE signal is detected, no matter which mute type is selected the
transceiver will stop scanning and attempt to decode the ALE call. In this mode the
interconnect will also stop when Selcall signals are detected.
Note:
For Selcall tones to be decoded successfully when ALE is enabled the ALE
needs to be set up to scan at a rate of 2 channels per second not 5 channels per
second. (Refer to programming transceiver guide)
Initiating scan
Press the
key.
Alternatively scan may be programmed as a default condition so when the 2060
interconnect is switched on, scan is automatically initiated, or after a period of
inactivity, i.e. no key presses, it will return to scan.
When in scan mode the 2060 display will show the scan icon.
Scan with no ALE
Scan with ALE
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