Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?
The correct answer is D: Find a clear frequency during the alternate time slot to the calling station. Good practice when choosing a transmitting frequency to answer a station calling CQ using FT8 is to find a clear frequency during the alternate time slot to the calling station. FT8 uses time slots, and you should transmit in the opposite slot from the calling station. For amateur radio operators, this prevents collisions and ensures successful contacts. Understanding this helps when operating FT8.
Exam Tip
Answer FT8 CQ = clear frequency in alternate time slot. Think 'F'T8 = 'F'ind 'T'ransmit frequency in 'A'lternate 'T'ime slot. Use a different frequency in the opposite time slot from the calling station. Not same frequency, not same time slot - alternate time slot on different frequency.
Memory Aid
"Answer FT8 CQ = clear frequency in alternate time slot. Think 'F'T8 = 'F'ind 'T'ransmit in 'A'lternate 'T'ime slot. Use a different frequency in the opposite time slot from the calling station. Prevents collisions in FT8 operation."
Real-World Application
A station calls CQ on FT8 at 14.074 MHz during the even time slot. You find a clear frequency (e.g., 14.075 MHz) and transmit during the odd time slot (alternate slot). This prevents collisions and ensures the calling station can receive your response. Using the same time slot or same frequency would cause interference.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Calling on the station's frequency would cause interference - you need to use a different frequency in the alternate time slot.
Option B: Incorrect. Calling on any frequency in the waterfall except the station's frequency doesn't account for time slots - you need to use the alternate time slot.
Option C: Incorrect. Finding a clear frequency during the same time slot would cause collisions - you need the alternate time slot.
题目解析
The correct answer is D: Find a clear frequency during the alternate time slot to the calling station. Good practice when choosing a transmitting frequency to answer a station calling CQ using FT8 is to find a clear frequency during the alternate time slot to the calling station. FT8 uses time slots, and you should transmit in the opposite slot from the calling station. For amateur radio operators, this prevents collisions and ensures successful contacts. Understanding this helps when operating FT8.
考试技巧
Answer FT8 CQ = clear frequency in alternate time slot. Think 'F'T8 = 'F'ind 'T'ransmit frequency in 'A'lternate 'T'ime slot. Use a different frequency in the opposite time slot from the calling station. Not same frequency, not same time slot - alternate time slot on different frequency.
记忆口诀
Answer FT8 CQ = clear frequency in alternate time slot. Think 'F'T8 = 'F'ind 'T'ransmit in 'A'lternate 'T'ime slot. Use a different frequency in the opposite time slot from the calling station. Prevents collisions in FT8 operation.
实际应用示例
A station calls CQ on FT8 at 14.074 MHz during the even time slot. You find a clear frequency (e.g., 14.075 MHz) and transmit during the odd time slot (alternate slot). This prevents collisions and ensures the calling station can receive your response. Using the same time slot or same frequency would cause interference.
错误选项分析
Option A: Incorrect. Calling on the station's frequency would cause interference - you need to use a different frequency in the alternate time slot. Option B: Incorrect. Calling on any frequency in the waterfall except the station's frequency doesn't account for time slots - you need to use the alternate time slot. Option C: Incorrect. Finding a clear frequency during the same time slot would cause collisions - you need the alternate time slot.
知识点
FT8, Time slots, Digital mode operation, FT8 procedures
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.