Electronics and Communication Engineering - Exam Questions Papers - Discussion

A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is

Answer: Option D

Explanation:

P_m = kT₀Δ_f(F - 1) = 93.15 x 10^-15 W.

Manhar said: (Oct 8, 2015)
Can I get basics in radars?

Santhosh said: (Jan 14, 2017)
Unit of F?

Vinay said: (Mar 8, 2017)
Pmin = k T B F (S/N)min. K-Blotzmann's Constant = 1.38 x 10-23 (Watt*sec/°Kelvin). T = Temperature (°Kelvin). B = Receiver Bandwidth (Hz). F = Noise Factor (ratio), Noise Figure (dB). (S/N)min = Minimum Signal to Noise Ratio.

Thenmozhi said: (Nov 20, 2018)
What is the value of Δf and F?

Nooman said: (Jan 8, 2021)
@Thenmozi, Change in f is the bandwidth and F or NF is the Noise Figure in dB.

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