When may an amateur station transmit without identifying on the air?
The correct answer is D: When transmitting signals to control model craft. According to FCC Part 97.119(b), you may transmit without identifying when transmitting telecommand signals to control model craft (aircraft, boats, or vehicles). This is a specific exception to the normal identification requirements.
Telecommand signals for model control are typically very brief and encoded, making normal voice identification impractical. The FCC recognizes this and provides an exception for these specific control transmissions. However, this exception applies only to telecommand signals for model control - all other transmissions must include proper station identification. This exception is narrow and specific to radio control operations.
Exam Tip
No ID required = Model craft control only. Remember: The only exception to identification is when transmitting telecommand signals to control model craft. All other transmissions require identification.
Memory Aid
"**N**o **I**D = **M**odel **C**raft (think 'NI = MC' = No ID for Model Craft)"
Real-World Application
You're operating a radio-controlled model airplane using amateur frequencies. The control signals you send to the aircraft are very brief and encoded. According to FCC rules, you don't need to identify your station with each control signal because these are telecommand transmissions for model control. However, if you were having a voice conversation or making other transmissions, you would need to identify normally.
FCC Part 97.119(b)Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Brief transmissions for station adjustments still require identification. There's no exception for test transmissions.
Option B: Incorrect. Unmodulated transmissions (carrier only) still require identification. The mode doesn't exempt you from identification requirements.
Option C: Incorrect. Low power (below 1 watt) doesn't exempt you from identification. Power level doesn't affect identification requirements.
题目解析
The correct answer is D: When transmitting signals to control model craft. According to FCC Part 97.119(b), you may transmit without identifying when transmitting telecommand signals to control model craft (aircraft, boats, or vehicles). This is a specific exception to the normal identification requirements. Telecommand signals for model control are typically very brief and encoded, making normal voice identification impractical. The FCC recognizes this and provides an exception for these specific control transmissions. However, this exception applies only to telecommand signals for model control - all other transmissions must include proper station identification. This exception is narrow and specific to radio control operations.
考试技巧
No ID required = Model craft control only. Remember: The only exception to identification is when transmitting telecommand signals to control model craft. All other transmissions require identification.
记忆口诀
**N**o **I**D = **M**odel **C**raft (think 'NI = MC' = No ID for Model Craft)
实际应用示例
You're operating a radio-controlled model airplane using amateur frequencies. The control signals you send to the aircraft are very brief and encoded. According to FCC rules, you don't need to identify your station with each control signal because these are telecommand transmissions for model control. However, if you were having a voice conversation or making other transmissions, you would need to identify normally.
错误选项分析
Option A: Incorrect. Brief transmissions for station adjustments still require identification. There's no exception for test transmissions. Option B: Incorrect. Unmodulated transmissions (carrier only) still require identification. The mode doesn't exempt you from identification requirements. Option C: Incorrect. Low power (below 1 watt) doesn't exempt you from identification. Power level doesn't affect identification requirements.
知识点
FCC Part 97.119(b), Station identification, Telecommand, Model craft control
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.