What is CW?
The correct answer is D: Another name for a Morse code transmission. CW is another name for a Morse code transmission. CW stands for Continuous Wave, referring to the unmodulated carrier that's keyed on and off to form Morse code. For amateur radio operators, CW is the traditional mode, used since the earliest days of radio. CW is highly efficient, uses minimal bandwidth, and is excellent for weak-signal work. Understanding that CW means Morse code helps when discussing operating modes and explains why CW is still popular despite being an older technology.
Exam Tip
CW = Continuous Wave = Morse code. Think 'C'W = 'C'ontinuous 'W'ave = 'C'ode (Morse). Unmodulated carrier keyed on/off to form Morse code. Not propagation, not a 2m FM digital mode, not coil winding.
Memory Aid
"CW = Continuous Wave = Morse code. Think 'C'W = 'C'ontinuous 'W'ave = 'C'ode (Morse). Unmodulated carrier keyed on/off. Traditional amateur radio mode for over 100 years."
Real-World Application
You operate CW on 20 meters, sending Morse code by keying your transmitter on and off. The unmodulated carrier (continuous wave) is interrupted to form dots and dashes. This is CW - the traditional Morse code mode that's been used in amateur radio for over 100 years. It's highly efficient and excellent for weak-signal work.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. CW isn't a type of electromagnetic propagation - propagation refers to how radio waves travel, not a transmission mode. CW is a mode, not a propagation type.
Option B: Incorrect. CW isn't specifically a digital mode on 2 meter FM - CW is used on all bands and is an analog mode (keyed carrier), not a digital mode.
Option C: Incorrect. CW isn't a coil winding technique - that's a construction method, not a transmission mode. CW is Morse code transmission.
题目解析
The correct answer is D: Another name for a Morse code transmission. CW is another name for a Morse code transmission. CW stands for Continuous Wave, referring to the unmodulated carrier that's keyed on and off to form Morse code. For amateur radio operators, CW is the traditional mode, used since the earliest days of radio. CW is highly efficient, uses minimal bandwidth, and is excellent for weak-signal work. Understanding that CW means Morse code helps when discussing operating modes and explains why CW is still popular despite being an older technology.
考试技巧
CW = Continuous Wave = Morse code. Think 'C'W = 'C'ontinuous 'W'ave = 'C'ode (Morse). Unmodulated carrier keyed on/off to form Morse code. Not propagation, not a 2m FM digital mode, not coil winding.
记忆口诀
CW = Continuous Wave = Morse code. Think 'C'W = 'C'ontinuous 'W'ave = 'C'ode (Morse). Unmodulated carrier keyed on/off. Traditional amateur radio mode for over 100 years.
实际应用示例
You operate CW on 20 meters, sending Morse code by keying your transmitter on and off. The unmodulated carrier (continuous wave) is interrupted to form dots and dashes. This is CW - the traditional Morse code mode that's been used in amateur radio for over 100 years. It's highly efficient and excellent for weak-signal work.
错误选项分析
Option A: Incorrect. CW isn't a type of electromagnetic propagation - propagation refers to how radio waves travel, not a transmission mode. CW is a mode, not a propagation type. Option B: Incorrect. CW isn't specifically a digital mode on 2 meter FM - CW is used on all bands and is an analog mode (keyed carrier), not a digital mode. Option C: Incorrect. CW isn't a coil winding technique - that's a construction method, not a transmission mode. CW is Morse code transmission.
知识点
CW, Continuous Wave, Morse code, Operating modes
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.