Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?
The correct answer is D: 420 MHz - 430 MHz. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A is 420 MHz - 430 MHz. Stations north of Line A in the contiguous 48 states cannot transmit in 420-430 MHz. For amateur radio operators, this is important for understanding frequency restrictions. Understanding this helps ensure legal operation.
Exam Tip
Stations north of Line A in contiguous 48 states = cannot transmit in 420-430 MHz. Think 'N'orth of 'L'ine 'A' = 'N'o '4'20-'4'30 MHz. Stations north of Line A in contiguous 48 states cannot transmit in 420-430 MHz. Not 440-450 MHz, not 53-54 MHz, not 222-223 MHz - just 420-430 MHz.
Memory Aid
"Stations north of Line A in contiguous 48 states = cannot transmit in 420-430 MHz. Think 'N'orth of 'L'ine 'A' = 'N'o '4'20-'4'30 MHz. Stations north of Line A in contiguous 48 states cannot transmit in 420-430 MHz. Important frequency restriction."
Real-World Application
An amateur station located in the contiguous 48 states and north of Line A: It may not transmit in the 420-430 MHz segment. This restriction is due to coordination with other services. Other segments (440-450 MHz, 53-54 MHz, 222-223 MHz) are not restricted. This is the restriction - 420-430 MHz is prohibited for stations north of Line A.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option A (440-450 MHz): Incorrect. 440-450 MHz isn't restricted - 420-430 MHz is restricted. 440-450 MHz is wrong.
Option B (53-54 MHz): Incorrect. 53-54 MHz isn't restricted - 420-430 MHz is restricted. 53-54 MHz is wrong.
Option C (222-223 MHz): Incorrect. 222-223 MHz isn't restricted - 420-430 MHz is restricted. 222-223 MHz is wrong.
题目解析
The correct answer is D: 420 MHz - 430 MHz. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A is 420 MHz - 430 MHz. Stations north of Line A in the contiguous 48 states cannot transmit in 420-430 MHz. For amateur radio operators, this is important for understanding frequency restrictions. Understanding this helps ensure legal operation.
考试技巧
Stations north of Line A in contiguous 48 states = cannot transmit in 420-430 MHz. Think 'N'orth of 'L'ine 'A' = 'N'o '4'20-'4'30 MHz. Stations north of Line A in contiguous 48 states cannot transmit in 420-430 MHz. Not 440-450 MHz, not 53-54 MHz, not 222-223 MHz - just 420-430 MHz.
记忆口诀
Stations north of Line A in contiguous 48 states = cannot transmit in 420-430 MHz. Think 'N'orth of 'L'ine 'A' = 'N'o '4'20-'4'30 MHz. Stations north of Line A in contiguous 48 states cannot transmit in 420-430 MHz. Important frequency restriction.
实际应用示例
An amateur station located in the contiguous 48 states and north of Line A: It may not transmit in the 420-430 MHz segment. This restriction is due to coordination with other services. Other segments (440-450 MHz, 53-54 MHz, 222-223 MHz) are not restricted. This is the restriction - 420-430 MHz is prohibited for stations north of Line A.
错误选项分析
Option A (440-450 MHz): Incorrect. 440-450 MHz isn't restricted - 420-430 MHz is restricted. 440-450 MHz is wrong. Option B (53-54 MHz): Incorrect. 53-54 MHz isn't restricted - 420-430 MHz is restricted. 53-54 MHz is wrong. Option C (222-223 MHz): Incorrect. 222-223 MHz isn't restricted - 420-430 MHz is restricted. 222-223 MHz is wrong.
知识点
Contiguous 48 states, North of Line A, 420 MHz - 430 MHz, Frequency restriction
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.