Deep Dive: E6E05
The correct answer is A: 0.5 dB. Which of the following noise figure values is typical of a low-noise UHF preamplifier is 0.5 dB. Low-noise UHF preamps typically have noise figures around 0.5 dB. For amateur radio operators, this is important for receiver design. Understanding this helps when evaluating preamplifiers.
Why Other Answers Are Wrong
Option B (-10 dB): Incorrect. -10 dB isn't a valid noise figure - noise figure is positive. -10 dB is wrong. Option C (44 dBm): Incorrect. 44 dBm is a power level, not noise figure - noise figure is in dB. 44 dBm is wrong. Option D (-20 dBm): Incorrect. -20 dBm is a power level, not noise figure - noise figure is in dB. -20 dBm is wrong.
Exam Tip
Low-noise UHF preamp noise figure = 0.5 dB. Think 'L'ow-'N'oise 'U'HF = '0'.5 dB. Low-noise UHF preamps typically have noise figures around 0.5 dB. Not -10 dB (invalid), not 44 dBm (power), not -20 dBm (power) - just 0.5 dB.
Memory Aid
Low-noise UHF preamp noise figure = 0.5 dB. Think 'L'ow-'N'oise = '0'.5 dB. Low-noise UHF preamps typically have noise figures around 0.5 dB. Important for receiver design.
Real-World Example
A low-noise UHF preamplifier: A typical noise figure value is 0.5 dB. This is very low noise, making it suitable for weak signal reception. This is the value - 0.5 dB noise figure.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6E
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6E topic.