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Question 195

How much does increasing a receiver’s bandwidth from 50 Hz to 1,000 Hz increase the receiver’s noise floor?

  1. 3 dB
  2. 5 dB
  3. 10 dB
  4. 13 dBCorrect answer

Explanation

Thermal noise power is proportional to bandwidth, so the noise floor rises by ten times the base-ten logarithm of the bandwidth ratio. Widening from 50 Hz to 1,000 Hz is a factor of 20, and 10 log₁₀ 20 is 13 dB.

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Question 195: How much does increasing a receiver’s bandwidth from 50 Hz… · FCC Amateur Extra Class (Element 4) · Questena