G1A12:

[97.303]

Which of the following applies when the FCC rules designate the Amateur Service as a secondary user on a band?

  1. Amateur stations must record the call sign of the primary service station before operating on a frequency assigned to that station
  2. Amateur stations can use the band only during emergencies
  3. Amateur stations can use the band only if they do not cause harmful interference to primary users
  4. Amateur stations may only operate during specific hours of the day, while primary users are permitted 24-hour use of the band