Refer to the exhibit. It displays the sources of A, B, and C and the corresponding absolute power of each. In comparing source A and B, how much greater is the signal strength of source B than the strength of A?
- 3 dB
- 4 dB
- 6 dB
- 30 dB
Explanation: Source B is four times the value of source A. Each time you double a value, simply add 3 dB. If you double source A from 10 mW to 20 mW you add 3 dB. If you double 20 mW to 40 mW you now add an additional 3 dB. Add the first 3 dB to the second 3 dB and you can conclude that the signal strength of source B is 6 dB greater than source A.
Exam with this question: Quiz - Wireless Signals and Modulation
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