HP
HPE6-A85 · Question #38
When measuring signal strength, dBm is commonly used and 0 dBm corresponds to 1 mW power. What does -20 dBm correspond to?
The correct answer is B. .01 mw. dBm is a unit of power that measures the ratio of a given power level to 1 mW. The formula to convert dBm to mW is: P(mW) = 1mW 10^(P(dBm)/10). Therefore, -20 dBm corresponds to 0.01 mW, as follows: P(mW) = 1mW 10^(-20/10) = 0.01 mW
Fundamentals of Campus Access Networking
Question
When measuring signal strength, dBm is commonly used and 0 dBm corresponds to 1 mW power. What does -20 dBm correspond to?
Options
- A.-1 mW
- B.01 mw
- C10 mW
- D1mW
How the community answered
(38 responses)- A13% (5)
- B79% (30)
- C3% (1)
- D5% (2)
Explanation
dBm is a unit of power that measures the ratio of a given power level to 1 mW. The formula to convert dBm to mW is: P(mW) = 1mW * 10^(P(dBm)/10). Therefore, -20 dBm corresponds to 0.01 mW, as follows: P(mW) = 1mW * 10^(-20/10) = 0.01 mW
Topics
#dBm#signal strength#RF math#power measurement
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