Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 1 (Q.No. 5)
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
3.45 x 10-15 W
1.38 x 10-15 W
7.5 x 10-15 W
93.15 x 10-15 W
Answer: Option
Explanation:

Pm = kT0Δf(F - 1) = 93.15 x 10-15 W.

Discussion:
5 comments Page 1 of 1.

Nooman said:   3 years ago
@Thenmozi,

Change in f is the bandwidth and F or NF is the Noise Figure in dB.

Thenmozhi said:   6 years ago
What is the value of Δf and F?

Vinay said:   7 years ago
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.

Santhosh said:   7 years ago
Unit of F?

Manhar said:   9 years ago
Can I get basics in radars?

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