Question
When is it permissible to transmit messages encoded to obscure their meaning?
Answer Options
- A) Only during contests
- B) Only when transmitting certain approved digital codes
- C) Only when transmitting control commands to space stations or radio control craft
- D) Never
Correct Answer: C
Explanation
In general, amateur radio transmissions must be sent using clear language or standard, publicly known codes (like Q-signals or digital protocols) so that their meaning is not hidden. The FCC prohibits using codes or ciphers to obscure the meaning of a message.
There is one important exception: it is permissible to use encrypted or encoded signals only when sending control commands to a space station or radio control model craft. This is necessary to ensure the security of the command links so that unauthorized persons cannot interfere with the control of the satellite or model craft.
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