Question T1D03
From subelement T1 - T1D
When is it permissible to transmit messages encoded to obscure their meaning?
Why is this correct?
The FCC generally prohibits encrypted or encoded transmissions that obscure meaning to maintain amateur radio's transparency. However, Part 97 creates one specific exception: control commands to space stations or radio control craft (like drones, model aircraft, or boats). This exception exists because these control signals need security to prevent interference or hijacking. Contest communications and digital modes must remain transparent and understandable.
Memory tip
Look for the pattern: amateur radio rules typically have one narrow exception to broad prohibitions. When you see 'only when' in multiple choices, identify which scenario involves legitimate operational security needs rather than general communication.
Learn more
This rule reflects amateur radio's fundamental principle of open communication while recognizing practical safety needs. In actual operation, this means you can encrypt commands to your satellite or drone to prevent malicious interference, but your voice contacts and digital messages must remain unencrypted. The FCC requires transparency in amateur communications to maintain the service's experimental and educational nature, as specified in Part 97.1's basis and purpose.
Think about it
Why do you think the FCC allows encryption for space and radio control commands but prohibits it for regular amateur communications between operators?