T1B04 If the FCC rules say that the amateur service is a secondary user of a frequency band, and another service is a primary user, what does this mean?
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Nothing special; all users of a frequency have equal rights to operate
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Amateurs are only allowed to use the frequency band during emergencies
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Amateurs are allowed to use the frequency band only if they do not cause harmful interference to primary users
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Amateurs must increase transmitter power to overcome any interference caused by primary users