HF NETWORKS
ENTRIES FOR AN HF NETWORK
ENVOY™ TRANSCEIVER REFERENCE MANUAL 145
Send preamble
You can set up the HF network to always send preamble, or only when it is scanning.
Therefore, if you are operating in an HF radio communication network that requires
stations to not be scanning, you can reduce network traffic by selecting Only when
scanning.
Related links:
Preamble on page 144
Sounding interval
The Sounding Interval entry applies to ALE/CALM HF networks only. The
sounding interval is the time between automatic sounding signals that the transceiver
sends to other stations to assess the quality of the channels in the HF network.
The recommended value is 5 hours. The longer the value, the longer the transceiver
takes to update its channel quality information. If the value is set to 5 hours, the
transceiver takes 5 days to completely update channel quality information. Longer
sounding intervals decrease the interruptions on channels allocated to this HF network
via a scan table.
NOTE: Link quality information is also updated each time a call is made or
received.
Privacy mode
The Privacy Mode entry applies to Codan Selcall and ALE/CALM HF networks
only. The privacy mode is the method used to encrypt the data content of calls between
stations. If you select Group, you must enter an appropriate password into the
Privacy Password entry.
When you are setting up ALE/CALM HF networks, you should ensure that you set up
HF networks with the same privacy mode for communication. If there is a mismatch
in privacy modes, the called station uses the most suitable privacy mode from the HF
networks through which the call may be received.
Privacy mode... Is used for...
Group encrypting data in calls between two stations (you
agree upon a password to enter into the Privacy
Password entry)
None calls made under a Codan protocol, which uses
special formatting
Plain (lowest mode)
(MIL-STD-188-141B
ALE option)
AMD messages in ALE calls (basic 64 ASCII subset
A to Z, 0 to 9, space ! " # $ % &' ( ) * + , - . /
: ; <= >? @ [ \ ] ^)
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