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2003 Course Advanced Communication Eng.

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Total No. of Questions : 12] P1482 [Total No. of Pages :2 [3764] - 248 B.E. (Electronics) ADVANCED COMMUNICATION ENGINEERING (2003 Course) (404205) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. SECTION - I Q1) a) State and explain the principle of operation of two cavity klystron amplifier. [8] b) State and explain the principle of operation of helix traveling wave tubes. [8] OR Q2) a) Draw a neat sketch of E-plane tee, H-plane tee and magic tee. Write S parameter matrix of each. [8] b) Draw a neat sketch of Directional Coupler . State the spacing between the centers of two holes of two hole directional coupler. Explain how the wave energy is Propagating through it. [8] Q3) a) State the characteristics of IMPATT Diodes. What do you understand by the term Negative Resistance ? [8] b) With the help of Voltage and Current waveforms explain the principle of operation of TRAPATT diodes. [8] OR Q4) a) What is Gunn Effect ? State the microwave generation and amplification using Gunn Diode. [8] b) State the physical structures and principle of operation of microwave transistors. [8] P.T.O. Q5) a) b) Write a short note on Plan Position Indicator (PPI). [9] With the help of block diagram explain the working of Pulsed Radar System . [9] OR Q6) a) b) Derive the Radar Range Equation. [9] Write a short note on System Losses in radar. [9] SECTION - II Q7) a) With the help of block diagram explain the Optical Fiber Communication Link. [8] b) State and explain different types of losses in Optical Fiber Communication. [8] OR Q8) a) b) Q9) a) b) Derive the equation of Numerical Aperture . [8] Write a short note on Modes and types of optical fibers. [8] State the advantages and disadvantages of DS-SS and FH-SS systems.[8] What is the difference between handoff and roaming? [8] OR Q10)a) What is meant by cell splitting? How it is used to increase cellular system capacity? Explain with suitable example. [8] b) State the difference between CDMA and other mobile communication techniques. [8] Q11)a) Discuss the main effects of the troposphere and the ionosphere with reference to signal propagation in satellite communication. [9] b) Explain the terms Synchronous Orbit, Polar orbits and Inclined Orbits . [9] OR Q12)a) b) Draw the block diagram of Earth Station receiver. Sketch the Noise Temperature Equivalent of the receiver. Derive the equation for system noise temperature. [9] Describe Satellite System Power Budget . kbkb [3764]-248 2 [9]

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