Setup procedures (part 1)
9390 Reference manual 5-3
Sounding On/Off (ALE option 0)
This ALE option switches sounding on or off.
When sounding is switched off, your transceiver no longer
sends or receives ALE sounding signals. For correct ALE
operation, you should leave sounding on all the time.
If ALE Silent Mode (ALE option 11) is switched on, the
Sounding On/Off option setting is ignored and your station
does not send or receive ALE sounding signals. To set the
sounding interval, see ALE sounding interval on page 5-11.
Channel Quality Decay Time (ALE option 2)
This ALE option sets the artificial decay time for the record
of channel quality that is stored in the channel quality table in
ALE controller memory.
You can switch decay off or set a decay time in the range
1–8 hours.
For example, switching the sounding off and setting a decay
time of four hours would result in the record of a perfect
channel (100% channel quality) decaying to an unusable
channel (0% channel quality) over a period of four hours.
Sounding Signal Length (ALE option 3)
This ALE option sets the length in seconds of the sounding
transmission for each channel in the scan group.
When an ALE station sends sounding signals, a separate
signal is transmitted for each channel in the scan group. The
ALE station sends these signals sequentially. The total length
of the sounding transmission is the product of the sounding
signal length and the number of channels.
For example, if the sounding signal length is set to 10 seconds
and the scan group contains seven channels, the ALE station
takes 70 seconds to complete sounding transmission.
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