Codan 2110 series Reference Manual page 164

The Network List
You may need to adjust the nominal preamble from the default value if:
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•
•
•
•
If a transceiver you want to call scans multiple networks, the preamble can be increased
to the time it takes that transceiver to scan all of its channels. The nominal preamble
must be set according to the transceiver in the communication network with the slowest
scan cycle.
For Codan Selcall or Open Selcall networks with more than 10 channels in the network,
the nominal preamble for each channel may be set to 0.3 s.
For ALE/CALM networks using Codan HF transceivers that are scanning identically, the
nominal preamble for each channel may be reduced to 0.15 s.
NOTE
148
the transceivers are not scanning identically
the transceivers are scanning multiple networks
more than 10 channels are included in the network being scanned
there is low channel availability due to a poor signal-to-noise ratio, interference, or
high traffic (that is, frequent pausing)
there are transceivers in the network that are also scanning for voice
The default nominal preamble for each channel in an ALE/CALM
network (see
ALE, and represents two ALE words (0.784 s).
Table 25 on page 147) complies with MIL-STD-188-141B
Manpack Transceiver 2110 series Reference Manual