Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?
The correct answer is A: 3 kHz. The acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands is 3 kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. For amateur radio operators, this is important for band compliance. Understanding this helps ensure legal operation.
Exam Tip
Digital voice/SSTV bandwidth on HF = 3 kHz. Think 'D'igital 'V'oice/'S'STV = '3' kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. Not 10 kHz, not 15 kHz, not 20 kHz - just 3 kHz.
Memory Aid
"Digital voice/SSTV bandwidth on HF = 3 kHz. Think 'D'igital 'V'oice/'S'STV = '3' kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. Important for band compliance."
Real-World Application
Digital voice or slow-scan TV transmissions on HF: The acceptable bandwidth is 3 kHz. This is the same as SSB phone bandwidth - digital voice and SSTV must fit within 3 kHz. Wider bandwidths (10, 15, or 20 kHz) are not acceptable on HF. 3 kHz is the limit - this is the acceptable bandwidth.
FCC Part 97.305Key Concepts
Why Other Options Are Wrong
Option B (10 kHz): Incorrect. 10 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 10 kHz is too wide.
Option C (15 kHz): Incorrect. 15 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 15 kHz is too wide.
Option D (20 kHz): Incorrect. 20 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 20 kHz is too wide.
题目解析
The correct answer is A: 3 kHz. The acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands is 3 kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. For amateur radio operators, this is important for band compliance. Understanding this helps ensure legal operation.
考试技巧
Digital voice/SSTV bandwidth on HF = 3 kHz. Think 'D'igital 'V'oice/'S'STV = '3' kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. Not 10 kHz, not 15 kHz, not 20 kHz - just 3 kHz.
记忆口诀
Digital voice/SSTV bandwidth on HF = 3 kHz. Think 'D'igital 'V'oice/'S'STV = '3' kHz. Digital voice and SSTV are limited to 3 kHz bandwidth on HF. Important for band compliance.
实际应用示例
Digital voice or slow-scan TV transmissions on HF: The acceptable bandwidth is 3 kHz. This is the same as SSB phone bandwidth - digital voice and SSTV must fit within 3 kHz. Wider bandwidths (10, 15, or 20 kHz) are not acceptable on HF. 3 kHz is the limit - this is the acceptable bandwidth.
错误选项分析
Option B (10 kHz): Incorrect. 10 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 10 kHz is too wide. Option C (15 kHz): Incorrect. 15 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 15 kHz is too wide. Option D (20 kHz): Incorrect. 20 kHz is too wide - digital voice and SSTV are limited to 3 kHz on HF. 20 kHz is too wide.
知识点
Digital voice, Slow-scan TV, HF amateur bands, 3 kHz bandwidth
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.