Home
Class 12
PHYSICS
Figure (EP) shows a communication system...

Figure (EP) shows a communication system. What is the output power when input signals is of 1.01 mW? [ gain in `dB = 10 log_10(P_0//P_t)]`.

Text Solution

Verified by Experts

Here, transmission path = 5 km
Loss suffered in transmission path
` = - 2 dB km^(-1) xx 5 km = - 10 dB`
Total amplifier gain `= 10dB + 20dB = 30dB`
Over gain of signal `= 30 dB - 10db = 20dB`
`:. 20 = 10 log_(10) (P_0//P_1)`
or `log_10 (P_0//P_(t)) = 20/10 = 2 = log_(10) 100 or P_0//P_t = 100 or P_0 = P_t xx 100 = 1.01 mW xx 100 = 101 mW`.
Promotional Banner

Topper's Solved these Questions

  • COMMUNICATION SYSTEMS

    PRADEEP|Exercise Short A/Q (3 marks)|8 Videos

  • COMMUNICATION SYSTEMS

    PRADEEP|Exercise Long answer questions|3 Videos

  • ATOMS AND NUCLEI

    PRADEEP|Exercise Assertion- Reason type question 12|1 Videos

  • CURRENT ELECTRICITY

    PRADEEP|Exercise Problems for Practice (B)|2 Videos

Similar Questions

Explore conceptually related problems

A 1 KW signal is transmitted using a communication channel which provides attenuatiom at the rate of - 2 dB per km . If the communication channel has a total length of 5 km , the power of the signal received is [ gain in dB = 10 log ((P_(0))/(P_(i)))]

Draw the output signal in a p-n junction diode when a square input singnal of 10 v as is applied across it

In a common emitter amplifier, using output reisistance of 5000 ohm and input resistance fo 2000 ohm, if the peak value of input signal voltage is 10 m V and beta=50 . The power gain is

If a p-n junction diode, a square input signal of 10 V is applied as shown. Then the out put signal across R_(L) will be .

The circuit diagram (see fig.) shows a 'logic combination' with the states outputs X,Y and Z given for input P,Q,R and S all at state 1 (i.e., high). When inputs P and R change to state 0 i.e., low) with inputs Q and S still at 1 , the condition of output X,Y and Z chages to

A signal of 0.1 kW is transmitted in a cable. The attenuation of cable is -5 dB per km and cable length is 20 km. The power received at receiver is 10^(-x) W. The value of x is _____ . [Gain in 10 log_(10) ((P_0)/(P_i)) ]