Which of the following is required when using FT8?
The correct answer is B: Computer time accurate to within approximately 1 second. When using FT8, you need computer time accurate to within approximately 1 second. FT8 uses synchronized time slots, so accurate time is essential. For amateur radio operators, this requires synchronizing your computer clock. Understanding this helps when setting up FT8 operation.
Exam Tip
FT8 requirement = computer time accurate to within ~1 second. Think 'F'T8 = 'F'ine 'T'ime '8'seconds accuracy. FT8 uses synchronized time slots, so accurate time is essential. Not about hardware modems, attenuators, or antenna polarization - just time accuracy.
Memory Aid
"FT8 requirement = computer time accurate to within ~1 second. Think 'F'T8 = 'F'ine 'T'ime. FT8 uses synchronized time slots, so accurate time is essential. Must synchronize computer clock for proper operation."
Real-World Application
You set up FT8 operation. You synchronize your computer clock to ensure it's accurate to within 1 second. FT8 uses time slots that must be synchronized, so accurate time is critical. Without accurate time, your transmissions won't align with the time slots, and contacts will fail.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. FT8 doesn't require special hardware modems - it uses software modems. A special hardware modem isn't needed.
Option C: Incorrect. Receiver attenuator settings aren't a requirement - that's an operating preference, not a requirement for FT8.
Option D: Incorrect. Vertically polarized antennas aren't required - FT8 works with any antenna polarization. Antenna polarization is a choice, not a requirement.
题目解析
The correct answer is B: Computer time accurate to within approximately 1 second. When using FT8, you need computer time accurate to within approximately 1 second. FT8 uses synchronized time slots, so accurate time is essential. For amateur radio operators, this requires synchronizing your computer clock. Understanding this helps when setting up FT8 operation.
考试技巧
FT8 requirement = computer time accurate to within ~1 second. Think 'F'T8 = 'F'ine 'T'ime '8'seconds accuracy. FT8 uses synchronized time slots, so accurate time is essential. Not about hardware modems, attenuators, or antenna polarization - just time accuracy.
记忆口诀
FT8 requirement = computer time accurate to within ~1 second. Think 'F'T8 = 'F'ine 'T'ime. FT8 uses synchronized time slots, so accurate time is essential. Must synchronize computer clock for proper operation.
实际应用示例
You set up FT8 operation. You synchronize your computer clock to ensure it's accurate to within 1 second. FT8 uses time slots that must be synchronized, so accurate time is critical. Without accurate time, your transmissions won't align with the time slots, and contacts will fail.
错误选项分析
Option A: Incorrect. FT8 doesn't require special hardware modems - it uses software modems. A special hardware modem isn't needed. Option C: Incorrect. Receiver attenuator settings aren't a requirement - that's an operating preference, not a requirement for FT8. Option D: Incorrect. Vertically polarized antennas aren't required - FT8 works with any antenna polarization. Antenna polarization is a choice, not a requirement.
知识点
FT8, Time synchronization, Computer time, FT8 requirements
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.