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  1. Exams
  2. IIT JEE
  3. Physics
  4. Communication systems
14 marks

Communication systems

This chapter covers the basic elements of communication systems and different types of wave propagation and modulation.

7 Topics
15h prep
1.3% subject weight
7 Topics
1

Propagation of electromagnetic waves in the atmosphere

2m1/10
📌 Key FormulaGround wave, sky wave, space wave.
2

Sky and space wave propagation

2m1/10
📌 Key FormulaSky wave uses ionosphere reflection, space wave for line-of-sight.
3

Need for modulation

2m1/10
📌 Key FormulaFor efficient transmission, reduce antenna height, avoid mixing.
4

Amplitude and Frequency Modulation

2m2/10
📌 Key FormulaAM: carrier amplitude varies with message, FM: frequency varies.
5

Bandwidth of signals

2m1/10
📌 Key FormulaRange of frequencies occupied by signal.
6

The bandwidth of Transmission medium

2m1/10
📌 Key FormulaRange of frequencies the medium can transmit.
7

Basic Elements of a Communication System (Block Diagram only)

2m1/10
📌 Key FormulaInformation source, transmitter, channel, receiver, destination.