UNIV4VINU | ENGINEERING ACHIEVERS

IF 252 — TELECOMMUNICATION SYSTEMS

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 ? 2 = 20 marks)

1. Draw clearly block diagram of superheterodyne receiver and give its frequencies.

2. What is gain of an antenna? Give its relationship.

3. Explain frequency reuse concept in mobile communication and give the relation for

frequency reuse distance.

4. What are the advantages of digital cellular systems?

5. Enumerate the various subsystems in satellite.

6. Enumerate the different types of orbits in satellite communication.

7. What are signal bandwidth limitations?

8. Enumerate the different types of fibers.

9. What are ISDN and DSL in telephone system?

10. Give the parameters for CT2 cordless telecommunication system.

PART B — (5 ? 16 = 80 marks)

11. (i) Explain, with diagrams, the amplitude–modulated transmitter oper ation.

(ii) Derive, from basic principles, the expression for received power in free space

propagation.

12. (a) (i) Explain, with block diagrams, the working of AMPS with relevant

specifications.

(ii) Explain digital cellular system with relevant specifications.

Or

(b) Explain, with relevant specifications, the services and features of cordless

telephone (CT2) system.

13. (a) (i) State and explain Kepler’s laws.

(ii) Discuss the importance of satellite transponder with relevant diagram.

Or

(b) (i) Explain the salient featur es of DBS TV satellite communication.

(ii) Explain, with diagrams, the Cassefrainion antenna used in earth station complex.

Discuss its parameters.

14. (a) (i) Discuss the features of attenuation and dispersion of glass fibers.

(ii) Draw clearly fiber optic communication system and discuss its constituent blocks.

Or