Electronics and Communication Engineering - Exam Questions Papers - Discussion

5. 

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

[A]. 3.45 x 10-15 W
[B]. 1.38 x 10-15 W
[C]. 7.5 x 10-15 W
[D]. 93.15 x 10-15 W

Answer: Option D

Explanation:

Pm = kT0Δf(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?

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