A) Only when transmitting control commands to space stations or radio control craft
NJ2X Notes:
Allowing encryption or other methods of protecting control commands to a space station or radio control craft helps assure the control operator stays in control. Physical access to an amateur radio in space is somewhat limited (i.e., you need a rocket to get there). It is important to understand that codes or ciphers are not allowed to hide the meaning of a message for other types of transmissions.
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