User's Manual

HF NETWORKS
ENTRIES FOR AN HF NETWORK
136 ENVOY™ TRANSCEIVER REFERENCE MANUAL
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.
For example, if a calling station starts an ALE call containing data through an HF
network that has its privacy mode set to Plain, and the called station determines that
the address is valid in HF networks with the privacy mode set to Group or Plain, then
it selects the HF network with the privacy mode set to Plain on which to establish the
link. Any data communications within this link use the basic 64 ASCII subset of
characters.
However, if the called station determines that the address is available in an HF
network with the privacy mode set to Group, it selects this HF network on which to
establish the link. Data communications within this link are only successful if the
calling station uses the same password as the HF network with the privacy mode set
to Group at the called station.
If a calling station starts an ALE call (without data), the called station determines in
which HF networks the address is valid, selects an HF network with the lowest privacy
mode available, then establishes the link. Data communications may proceed as per
the privacy modes of the selected calling and called HF networks.
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 ! " # $ % &' ( ) * + , - . /
: ; <= >? @ [ \ ] ^)