What frequency range is referred to as UHF?
The correct answer is D: 300 to 3000 MHz. UHF (Ultra High Frequency) refers to the frequency range from 300 MHz to 3000 MHz (3 GHz). This includes popular amateur bands like 70 centimeters (420-450 MHz), 33 centimeters (902-928 MHz), and 23 centimeters (1240-1300 MHz).
UHF frequencies are above VHF (30-300 MHz) and below SHF (Super High Frequency, 3-30 GHz). UHF signals are typically line-of-sight and provide excellent local communications. They're less affected by atmospheric conditions than HF but more affected by obstructions. UHF is commonly used for repeaters, satellite communications, and local simplex operations.
Exam Tip
UHF = 300-3000 MHz. Remember: UHF (Ultra High Frequency) is 300 MHz to 3000 MHz (3 GHz). This includes 70 cm, 33 cm, and 23 cm bands.
Memory Aid
"**U**HF = **3**00-**3**000 **M**Hz (think 'UHF = 300-3000 MHz')"
Real-World Application
You're operating on 446.0 MHz, which is in the 70-centimeter band. This frequency is within the UHF range (300-3000 MHz). Your 70-cm radio operates in the UHF spectrum, which provides excellent local communications and is commonly used for repeaters and satellite work.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 30-300 kHz is LF (Low Frequency), not UHF. UHF is much higher.
Option B: Incorrect. 30-300 MHz is VHF (Very High Frequency), not UHF. UHF starts at 300 MHz.
Option C: Incorrect. 300-3000 kHz is in the MF/HF range, not UHF. UHF is 300-3000 MHz.
题目解析
The correct answer is D: 300 to 3000 MHz. UHF (Ultra High Frequency) refers to the frequency range from 300 MHz to 3000 MHz (3 GHz). This includes popular amateur bands like 70 centimeters (420-450 MHz), 33 centimeters (902-928 MHz), and 23 centimeters (1240-1300 MHz). UHF frequencies are above VHF (30-300 MHz) and below SHF (Super High Frequency, 3-30 GHz). UHF signals are typically line-of-sight and provide excellent local communications. They're less affected by atmospheric conditions than HF but more affected by obstructions. UHF is commonly used for repeaters, satellite communications, and local simplex operations.
考试技巧
UHF = 300-3000 MHz. Remember: UHF (Ultra High Frequency) is 300 MHz to 3000 MHz (3 GHz). This includes 70 cm, 33 cm, and 23 cm bands.
记忆口诀
**U**HF = **3**00-**3**000 **M**Hz (think 'UHF = 300-3000 MHz')
实际应用示例
You're operating on 446.0 MHz, which is in the 70-centimeter band. This frequency is within the UHF range (300-3000 MHz). Your 70-cm radio operates in the UHF spectrum, which provides excellent local communications and is commonly used for repeaters and satellite work.
错误选项分析
Option A: Incorrect. 30-300 kHz is LF (Low Frequency), not UHF. UHF is much higher. Option B: Incorrect. 30-300 MHz is VHF (Very High Frequency), not UHF. UHF starts at 300 MHz. Option C: Incorrect. 300-3000 kHz is in the MF/HF range, not UHF. UHF is 300-3000 MHz.
知识点
UHF, Frequency range, 300-3000 MHz, Amateur bands
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.