User's Manual

SCAN TABLES
ENTRIES FOR A SCAN TABLE
ENVOY™ TRANSCEIVER REFERENCE MANUAL 123
NOTE: If you change the channel dwell time or change the number of channels
in the scan table, you must recalculate the duration of the preamble,
that is, the channel dwell time multiplied by the number of channels in
the HF network.
NOTE: You cannot set a channel dwell time that is lower than the default
value.
Related links:
Preamble length on page 134
HF network
The HF Network entry in a scan table is read only. It shows the HF networks in which
the scan table is used. This entry is populated when the scan tables are allocated to the
HF network.
Data
The Data entry sets whether or not the channels in the scan table are scanned for data.
If you have an HF data modem attached to the transceiver, set the scan table to scan
for data. This provides the connected modems time to detect calling activity from
other data stations. If you enable data detection, the time that a transceiver dwells on
a channel defaults to 600 msec.
Table 4: Default channel dwell time for each type of HF network or
detection requirement
HF network type Detection requirement Default channel dwell time
(msec)
Codan Selcall None selected 250
Voice 550
Data 600
Open Selcall None selected 250
Voice 550
Data 600
ALE/CALM None selected 125
Voice 550
Data 600