What is the maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band?
The correct answer is A: 2.8 kHz. The maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band is 2.8 kHz. This narrow bandwidth limit helps prevent interference with other services that share the 60-meter band. For amateur radio operators, this restricts the modes that can be used on 60 meters - primarily SSB with limited bandwidth. Understanding this helps ensure legal operation on 60 meters.
Exam Tip
60-meter USB bandwidth = 2.8 kHz maximum. Think '6'0 meters = '2'.8 kHz 'B'andwidth. Narrow bandwidth limit to protect other services. Not 5.6, 1.8, or 3 kHz - 2.8 kHz is the maximum.
Memory Aid
"60-meter USB bandwidth = 2.8 kHz maximum. Think '6'0 meters = '2'.8 kHz 'B'andwidth. Narrow bandwidth limit for USB operation. Helps protect other services sharing the band."
Real-World Application
You operate USB on 60 meters. Your signal bandwidth must not exceed 2.8 kHz. This narrow limit restricts you to SSB operation with careful audio filtering. Wider bandwidth modes like wide SSB or AM would exceed this limit and violate regulations. The 2.8 kHz limit helps protect other services on the band.
Key Concepts
Why Other Options Are Wrong
Option B (5.6 kHz): Incorrect. 5.6 kHz exceeds the 60-meter limit - the maximum is 2.8 kHz for USB operation.
Option C (1.8 kHz): Incorrect. 1.8 kHz is below the limit but not the maximum - 2.8 kHz is the maximum allowed bandwidth.
Option D (3 kHz): Incorrect. 3 kHz exceeds the 2.8 kHz limit - the maximum is 2.8 kHz for USB on 60 meters.
题目解析
The correct answer is A: 2.8 kHz. The maximum bandwidth permitted by FCC rules for amateur radio stations transmitting on USB frequencies in the 60-meter band is 2.8 kHz. This narrow bandwidth limit helps prevent interference with other services that share the 60-meter band. For amateur radio operators, this restricts the modes that can be used on 60 meters - primarily SSB with limited bandwidth. Understanding this helps ensure legal operation on 60 meters.
考试技巧
60-meter USB bandwidth = 2.8 kHz maximum. Think '6'0 meters = '2'.8 kHz 'B'andwidth. Narrow bandwidth limit to protect other services. Not 5.6, 1.8, or 3 kHz - 2.8 kHz is the maximum.
记忆口诀
60-meter USB bandwidth = 2.8 kHz maximum. Think '6'0 meters = '2'.8 kHz 'B'andwidth. Narrow bandwidth limit for USB operation. Helps protect other services sharing the band.
实际应用示例
You operate USB on 60 meters. Your signal bandwidth must not exceed 2.8 kHz. This narrow limit restricts you to SSB operation with careful audio filtering. Wider bandwidth modes like wide SSB or AM would exceed this limit and violate regulations. The 2.8 kHz limit helps protect other services on the band.
错误选项分析
Option B (5.6 kHz): Incorrect. 5.6 kHz exceeds the 60-meter limit - the maximum is 2.8 kHz for USB operation. Option C (1.8 kHz): Incorrect. 1.8 kHz is below the limit but not the maximum - 2.8 kHz is the maximum allowed bandwidth. Option D (3 kHz): Incorrect. 3 kHz exceeds the 2.8 kHz limit - the maximum is 2.8 kHz for USB on 60 meters.
知识点
60-meter bandwidth, USB operation, Bandwidth limits, 60-meter restrictions
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.