2.1 If
the Noise figure of a receiver is 2.5 dB, what reduction (measured in dB)
occurs in the signal to noise ratio at the output compared to the signal to
noise ratio at the input?
Sol We
know that
Noise figure=Si/Ni/So/No2.5 dB
Noise figure is the measure of the degradation of the SNR
as the signal passes through the receiver. So the signal to noise ratio at the
output is 2.5 dB less than the signal to noise ratio at the input.
2.5 The average time between false
alarms is specified as 30 min and the receiver bandwidth is 0.4 MHz:
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