STUPIDSID
1 (a)
A 400 watts carrier is modulated to a depth of 75%. Find the total power in the amplitude modulated wave. Assume modulated signal to be a sinusoidal one.
5 M
1 (b)
The bit sequence 1011101011 is to be transmitted using following formats:
(i) Unipolar RZ
(ii) Unipolar NRZ
(iii) Bipolar RZ
(iv) Bipolar NRZ
(v) Split - phase manchester
Draw all the waveforms.
(i) Unipolar RZ
(ii) Unipolar NRZ
(iii) Bipolar RZ
(iv) Bipolar NRZ
(v) Split - phase manchester
Draw all the waveforms.
5 M
1 (c)
Describe the significance of FM noise triangle.
5 M
1 (d)
Explain in brief frequency division multiplexing.
5 M
2 (a)
Define the following propagation terms:
(i) Critical frequency and critical angle
(ii) virtual height
(iii) MUF
(iv) Skip distance and Skip zone
(v) Free - space path loss
(i) Critical frequency and critical angle
(ii) virtual height
(iii) MUF
(iv) Skip distance and Skip zone
(v) Free - space path loss
10 M
2 (b)
A reciever connected to an antenna whose resistance is 50?. Calculate the reciever's noise figure in decibles and its equivalent noise temperature.
5 M
2 (c)
Explain the difference between correlated and uncorrelated noise.
5 M
3 (a)
Draw and explain the block diagram of an ISB transmitter.
10 M
3 (b)
Draw and explain the 'Third method' of SSB generation. That uses the balance mmodulator to suppress the carrier.
10 M
4 (a)
If the signal V(t) = 20sin(6.28*106t+10sin6.28*103t) represents a phase modulated signal, determine:
(i) Carrier frequency
(ii) Modulating frequency
(iii) Modulating index
(iv) Peak phase deviation
(i) Carrier frequency
(ii) Modulating frequency
(iii) Modulating index
(iv) Peak phase deviation
5 M
4 (b)
Describe the difference between FM and AM reciever, bearing in mind the different frequency ranges and bandwidths over which they operate.
5 M
4 (c)
Explain the operation of balanced slope detector, using a circuit diagram and response characteristics.
10 M
5 (a)
Draw the block diagram of an AM superheterodyne reciever and describe its operation and the primary function of each stage.
10 M
5 (b)
Describe the important parameters of radio reciever.
10 M
6 (a)
State and prove sampling theorem in time domain.
10 M
6 (b)
For a PAM transmission of voice signal having maximum frequency equal to Fm=3KHz, calculate the transmission bandwidth. It is given that the sampling frequency Fs=8KHz and the pulse duration t=0.1Ts.
10 M
7 (a)
What is the slope overload distortion and granular noise in delta moduation? How is it removed in ADM?
10 M
7 (b)
With the help of a neat diagram explain the transmitter and reciever of pulse code modulation.
10 M
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