Deep Dive: E1B02
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E1B
Reference: FCC Part 97.305
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E1B topic.