A1 kW signal is transmitted using a communication channel which provides attenuation at the rate of -2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in dB=10 log10(p0/pi)]
(a) 900 W (b) 100 W (c) 990 W (d) 1010 W
A1 kW signal is transmitted using a communication channel which provides attenuation at the rate of -2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in dB=10 log10(p0/pi)]
(a) 900 W (b) 100 W (c) 990 W (d) 1010 W
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer-b
p = 1kW= 1000W
Attenuation of signal = -2dB/km and total path length = 5km
Gain in dB= 5
Gain in dB= 10 log (p0/pi)……. (i)
-10=10 log (p0/pi)= -10log (pi/po)
logPi/po=1 = log (pi/po)= log10
pi/p0=10= 1000W= 10p0
p0=100W
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