Question
Which of the following applies when the FCC rules designate the amateur service as a secondary user on a band?
Answer Options
- A) Amateur stations must record the call sign of the primary service station before operating on a frequency assigned to that station
- B) Amateur stations may use the band only during emergencies
- C) Amateur stations must not cause harmful interference to primary users and must accept interference from primary users
- D) Amateur stations may only operate during specific hours of the day, while primary users are permitted 24-hour use of the band
Correct Answer: C
Explanation
When the FCC designates the amateur service as a secondary user on a band, it means that the amateur station is obliged to protect the primary service user. The amateur service must not cause harmful interference to the primary user’s operations and must accept any interference received from them. The primary user has absolute precedence and protection.
This rule, found in FCC \S 97.303, is a fundamental principle of frequency allocation. This allows the spectrum to be shared for multiple purposes. If an amateur station causes harmful interference to a primary user, the amateur station must cease operation immediately, regardless of the nature of the amateur’s transmission.
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