How many horizontal lines make up a fast-scan (NTSC) television frame?
The correct answer is C: 525. How many horizontal lines make up a fast-scan (NTSC) television frame is 525. NTSC television uses 525 lines per frame. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
Exam Tip
NTSC frame = 525 horizontal lines. Think 'N'TSC = '5'25 lines. NTSC television uses 525 lines per frame. Not 30 (frame rate), not 60 (field rate), not 1080 (HD) - just 525 lines.
Memory Aid
"NTSC frame = 525 horizontal lines. Think 'N'TSC = '5'25 lines. NTSC television uses 525 lines per frame. Important for fast-scan TV operation."
Real-World Application
A fast-scan (NTSC) television frame: It consists of 525 horizontal lines. NTSC is the standard used in North America. The frame is divided into two fields (262.5 lines each) that are interlaced. This is the number of lines - 525 horizontal lines per frame.
Key Concepts
Why Other Options Are Wrong
Option A (30): Incorrect. 30 is the frame rate (frames per second), not the number of lines - NTSC has 525 lines per frame. 30 is frame rate.
Option B (60): Incorrect. 60 is the field rate (fields per second), not the number of lines - NTSC has 525 lines per frame. 60 is field rate.
Option D (1080): Incorrect. 1080 is for high-definition TV, not NTSC - NTSC has 525 lines per frame. 1080 is HD.
题目解析
The correct answer is C: 525. How many horizontal lines make up a fast-scan (NTSC) television frame is 525. NTSC television uses 525 lines per frame. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
考试技巧
NTSC frame = 525 horizontal lines. Think 'N'TSC = '5'25 lines. NTSC television uses 525 lines per frame. Not 30 (frame rate), not 60 (field rate), not 1080 (HD) - just 525 lines.
记忆口诀
NTSC frame = 525 horizontal lines. Think 'N'TSC = '5'25 lines. NTSC television uses 525 lines per frame. Important for fast-scan TV operation.
实际应用示例
A fast-scan (NTSC) television frame: It consists of 525 horizontal lines. NTSC is the standard used in North America. The frame is divided into two fields (262.5 lines each) that are interlaced. This is the number of lines - 525 horizontal lines per frame.
错误选项分析
Option A (30): Incorrect. 30 is the frame rate (frames per second), not the number of lines - NTSC has 525 lines per frame. 30 is frame rate. Option B (60): Incorrect. 60 is the field rate (fields per second), not the number of lines - NTSC has 525 lines per frame. 60 is field rate. Option D (1080): Incorrect. 1080 is for high-definition TV, not NTSC - NTSC has 525 lines per frame. 1080 is HD.
知识点
Fast-scan television, NTSC, 525 horizontal lines, Television frame
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.