What frequency range is referred to as VHF?
The correct answer is B: 30 MHz to 300 MHz. VHF (Very High Frequency) refers to the frequency range from 30 MHz to 300 MHz. This includes popular amateur bands like 6 meters (50-54 MHz), 2 meters (144-148 MHz), and 1.25 meters (222-225 MHz).
VHF frequencies are above HF (High Frequency, 3-30 MHz) and below UHF (Ultra High Frequency, 300-3000 MHz). VHF signals typically provide good local and regional communications, with some long-distance propagation possible under certain conditions (like sporadic-E, tropospheric ducting, or meteor scatter). VHF is where most Technician licensees do much of their operating.
Exam Tip
VHF = 30-300 MHz. Remember: VHF (Very High Frequency) is 30 MHz to 300 MHz. This includes 6 meters, 2 meters, and 1.25 meters.
Memory Aid
"**V**HF = **3**0-**3**00 **M**Hz (think 'VHF = 30-300 MHz')"
Real-World Application
You're operating on 146.52 MHz, which is in the 2-meter band. This frequency is within the VHF range (30-300 MHz). Your 2-meter radio operates in the VHF spectrum, which provides good local communications and some extended-range possibilities through various propagation modes.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 30-300 kHz is in the LF (Low Frequency) range, not VHF. VHF is much higher.
Option C: Incorrect. 300-3000 kHz is in the MF (Medium Frequency) and lower HF range, not VHF.
Option D: Incorrect. 300-3000 MHz is UHF (Ultra High Frequency), not VHF. VHF is 30-300 MHz.
题目解析
The correct answer is B: 30 MHz to 300 MHz. VHF (Very High Frequency) refers to the frequency range from 30 MHz to 300 MHz. This includes popular amateur bands like 6 meters (50-54 MHz), 2 meters (144-148 MHz), and 1.25 meters (222-225 MHz). VHF frequencies are above HF (High Frequency, 3-30 MHz) and below UHF (Ultra High Frequency, 300-3000 MHz). VHF signals typically provide good local and regional communications, with some long-distance propagation possible under certain conditions (like sporadic-E, tropospheric ducting, or meteor scatter). VHF is where most Technician licensees do much of their operating.
考试技巧
VHF = 30-300 MHz. Remember: VHF (Very High Frequency) is 30 MHz to 300 MHz. This includes 6 meters, 2 meters, and 1.25 meters.
记忆口诀
**V**HF = **3**0-**3**00 **M**Hz (think 'VHF = 30-300 MHz')
实际应用示例
You're operating on 146.52 MHz, which is in the 2-meter band. This frequency is within the VHF range (30-300 MHz). Your 2-meter radio operates in the VHF spectrum, which provides good local communications and some extended-range possibilities through various propagation modes.
错误选项分析
Option A: Incorrect. 30-300 kHz is in the LF (Low Frequency) range, not VHF. VHF is much higher. Option C: Incorrect. 300-3000 kHz is in the MF (Medium Frequency) and lower HF range, not VHF. Option D: Incorrect. 300-3000 MHz is UHF (Ultra High Frequency), not VHF. VHF is 30-300 MHz.
知识点
VHF, Frequency range, 30-300 MHz, Amateur bands
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.