On which of the following bands is phone operation prohibited?
The correct answer is B: 30 meters. Phone operation is prohibited on the 30-meter band. The 30-meter band (10.100-10.150 MHz) is restricted to CW and digital modes only - no voice (phone) operation is allowed. This restriction helps prevent interference with other services that share the band. For amateur radio operators, understanding this restriction is essential for legal operation. The 30-meter band is unique in having this phone prohibition.
Exam Tip
Phone prohibited = 30 meters only. Think '3'0 meters = '3'0-meter 'P'hone 'P'rohibition. Only band where phone (voice) is completely prohibited. All other listed bands allow phone in appropriate segments.
Memory Aid
"Phone prohibited = 30 meters only. Think '3'0 meters = '3'0-meter 'P'hone 'P'rohibition. Only band where voice operation is completely prohibited. CW and digital modes only."
Real-World Application
You want to operate phone on 30 meters, but this is prohibited. The 30-meter band (10.100-10.150 MHz) is restricted to CW and digital modes only. You can use CW, RTTY, or other digital modes, but no SSB, AM, or FM voice. This is the only HF band with a complete phone prohibition.
Key Concepts
Why Other Options Are Wrong
Option A (160 meters): Incorrect. Phone operation is allowed on 160 meters in the General/Extra phone segments.
Option C (17 meters): Incorrect. Phone operation is allowed on 17 meters in the appropriate segments.
Option D (12 meters): Incorrect. Phone operation is allowed on 12 meters in the appropriate segments.
题目解析
The correct answer is B: 30 meters. Phone operation is prohibited on the 30-meter band. The 30-meter band (10.100-10.150 MHz) is restricted to CW and digital modes only - no voice (phone) operation is allowed. This restriction helps prevent interference with other services that share the band. For amateur radio operators, understanding this restriction is essential for legal operation. The 30-meter band is unique in having this phone prohibition.
考试技巧
Phone prohibited = 30 meters only. Think '3'0 meters = '3'0-meter 'P'hone 'P'rohibition. Only band where phone (voice) is completely prohibited. All other listed bands allow phone in appropriate segments.
记忆口诀
Phone prohibited = 30 meters only. Think '3'0 meters = '3'0-meter 'P'hone 'P'rohibition. Only band where voice operation is completely prohibited. CW and digital modes only.
实际应用示例
You want to operate phone on 30 meters, but this is prohibited. The 30-meter band (10.100-10.150 MHz) is restricted to CW and digital modes only. You can use CW, RTTY, or other digital modes, but no SSB, AM, or FM voice. This is the only HF band with a complete phone prohibition.
错误选项分析
Option A (160 meters): Incorrect. Phone operation is allowed on 160 meters in the General/Extra phone segments. Option C (17 meters): Incorrect. Phone operation is allowed on 17 meters in the appropriate segments. Option D (12 meters): Incorrect. Phone operation is allowed on 12 meters in the appropriate segments.
知识点
30-meter band, Phone prohibition, Mode restrictions, Band allocations
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.