May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?
The correct answer is C: No, the sideband components will extend beyond the edge of the phone band segment. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone? No, the sideband components will extend beyond the edge of the phone band segment. 75-meter phone band for Extra class is 3.600-4.000 MHz. LSB extends 3 kHz below carrier, so 3.601 - 3 = 3.598 MHz, which is below 3.600 MHz band edge. For amateur radio operators, this is important for band compliance. Understanding this helps ensure legal operation.
Exam Tip
3.601 MHz LSB phone = sideband components extend beyond band edge. Think 'L'SB at '3'.601 = 'L'ower 'S'ideband extends to '3'.598 (below '3'.600 edge). LSB extends 3 kHz below carrier, so 3.601 - 3 = 3.598 MHz exceeds band. Not inside allocation, not displayed frequency, not below 3.610 - just sideband extends beyond band.
Memory Aid
"3.601 MHz LSB phone = sideband components extend beyond band edge. Think 'L'SB at '3'.601 = 'E'xtends beyond. LSB extends 3 kHz below carrier, exceeding band edge. Important for band compliance."
Real-World Application
A station on 3.601 MHz LSB phone: The lower sideband extends 3 kHz below the carrier, so it extends to 3.601 - 3 = 3.598 MHz. The 75-meter phone band for Extra class starts at 3.600 MHz, so the sideband component at 3.598 MHz is below the band edge. This makes the transmission illegal - sideband components extend beyond the phone band segment. This is why you cannot answer.
FCC Part 97.301Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Entire signal won't be inside SSB allocation - LSB extends below 3.600 MHz. Inside allocation is wrong.
Option B: Incorrect. Displayed frequency being within band isn't enough - sideband components extend beyond band. Displayed frequency isn't the issue.
Option D: Incorrect. US stations are permitted to use phone below 3.610 MHz - Extra class can use 3.600-4.000 MHz. Below 3.610 MHz isn't the issue.
题目解析
The correct answer is C: No, the sideband components will extend beyond the edge of the phone band segment. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone? No, the sideband components will extend beyond the edge of the phone band segment. 75-meter phone band for Extra class is 3.600-4.000 MHz. LSB extends 3 kHz below carrier, so 3.601 - 3 = 3.598 MHz, which is below 3.600 MHz band edge. For amateur radio operators, this is important for band compliance. Understanding this helps ensure legal operation.
考试技巧
3.601 MHz LSB phone = sideband components extend beyond band edge. Think 'L'SB at '3'.601 = 'L'ower 'S'ideband extends to '3'.598 (below '3'.600 edge). LSB extends 3 kHz below carrier, so 3.601 - 3 = 3.598 MHz exceeds band. Not inside allocation, not displayed frequency, not below 3.610 - just sideband extends beyond band.
记忆口诀
3.601 MHz LSB phone = sideband components extend beyond band edge. Think 'L'SB at '3'.601 = 'E'xtends beyond. LSB extends 3 kHz below carrier, exceeding band edge. Important for band compliance.
实际应用示例
A station on 3.601 MHz LSB phone: The lower sideband extends 3 kHz below the carrier, so it extends to 3.601 - 3 = 3.598 MHz. The 75-meter phone band for Extra class starts at 3.600 MHz, so the sideband component at 3.598 MHz is below the band edge. This makes the transmission illegal - sideband components extend beyond the phone band segment. This is why you cannot answer.
错误选项分析
Option A: Incorrect. Entire signal won't be inside SSB allocation - LSB extends below 3.600 MHz. Inside allocation is wrong. Option B: Incorrect. Displayed frequency being within band isn't enough - sideband components extend beyond band. Displayed frequency isn't the issue. Option D: Incorrect. US stations are permitted to use phone below 3.610 MHz - Extra class can use 3.600-4.000 MHz. Below 3.610 MHz isn't the issue.
知识点
Extra class operator, 3.601 MHz LSB phone, Sideband components, Phone band segment
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.