In addition to frequency, which of the following is used to identify amateur radio bands?
The correct answer is A: The approximate wavelength in meters. In addition to frequency, amateur radio bands are identified by their approximate wavelength in meters. This is a traditional way of naming bands that dates back to the early days of radio.
For example, the '20-meter band' refers to frequencies around 14 MHz, which have wavelengths of approximately 20 meters. The '2-meter band' refers to frequencies around 144 MHz with wavelengths of about 2 meters. This wavelength naming convention is widely used in amateur radio and provides an intuitive way to think about bands - longer wavelengths (lower frequencies) for longer-distance communications, shorter wavelengths (higher frequencies) for shorter-range communications.
Exam Tip
Band identification = Wavelength. Remember: Amateur bands are identified by their approximate wavelength in meters (2 meters, 20 meters, 80 meters, etc.) in addition to frequency.
Memory Aid
"**B**and **I**D = **B**y **W**avelength (think 'BI = BW' = By Wavelength)"
Real-World Application
When you say you're operating on '20 meters,' you're referring to the band by its wavelength. The 20-meter band covers approximately 14.000-14.350 MHz, and signals in this range have wavelengths around 20 meters. Similarly, '2 meters' refers to the 144-148 MHz band where signals have wavelengths around 2 meters. This wavelength naming is universal in amateur radio.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. While some bands have letter/number designators, wavelength is the primary identifier used in amateur radio. Most amateurs refer to bands by wavelength (2 meters, 20 meters, etc.).
Option C: Incorrect. Channel numbers are used in some services (like CB radio), but amateur bands are identified by wavelength, not channel numbers.
Option D: Incorrect. Not all options are correct. Wavelength is the primary identifier, though other methods exist.
题目解析
The correct answer is A: The approximate wavelength in meters. In addition to frequency, amateur radio bands are identified by their approximate wavelength in meters. This is a traditional way of naming bands that dates back to the early days of radio. For example, the '20-meter band' refers to frequencies around 14 MHz, which have wavelengths of approximately 20 meters. The '2-meter band' refers to frequencies around 144 MHz with wavelengths of about 2 meters. This wavelength naming convention is widely used in amateur radio and provides an intuitive way to think about bands - longer wavelengths (lower frequencies) for longer-distance communications, shorter wavelengths (higher frequencies) for shorter-range communications.
考试技巧
Band identification = Wavelength. Remember: Amateur bands are identified by their approximate wavelength in meters (2 meters, 20 meters, 80 meters, etc.) in addition to frequency.
记忆口诀
**B**and **I**D = **B**y **W**avelength (think 'BI = BW' = By Wavelength)
实际应用示例
When you say you're operating on '20 meters,' you're referring to the band by its wavelength. The 20-meter band covers approximately 14.000-14.350 MHz, and signals in this range have wavelengths around 20 meters. Similarly, '2 meters' refers to the 144-148 MHz band where signals have wavelengths around 2 meters. This wavelength naming is universal in amateur radio.
错误选项分析
Option B: Incorrect. While some bands have letter/number designators, wavelength is the primary identifier used in amateur radio. Most amateurs refer to bands by wavelength (2 meters, 20 meters, etc.). Option C: Incorrect. Channel numbers are used in some services (like CB radio), but amateur bands are identified by wavelength, not channel numbers. Option D: Incorrect. Not all options are correct. Wavelength is the primary identifier, though other methods exist.
知识点
Band identification, Wavelength, Amateur bands, Traditional naming
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.