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Communication SystemsNoise in Communication Systems

Two cascaded stages have F1=2, G1=10 and F2=5, where gain is a linear power ratio. The total noise factor is?

  • A2.0
  • B2.4
  • C2.5
  • D7.0
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Correct Answer: B. 2.4
Explanation: Friis' formula for two stages is F=F1+(F2-1)/G1=2+(5-1)/10=2.4.
Reference: Standard communication systems: Friis formula numerical
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