Contents

1. Introduction to Electronic Communication

1.1 Introduction

1.2 Block diagram of communication system

1.3 Modulation

1.4 Types of electronic communication

1.5 Applications of communication

1.6 Electromagnetic spectrum

1.7 Concept of Transmission bandwidth

2. Amplitude Modulation and Frequency Modulation

2.1 Introduction

2.2 Modulation

2.3 Amplitude Modulation

2.4 Mathematical Representation of Amplitude Modulated Wave

2.5 Modulation Index and Percentage of Modulation

2.6 Frequency Spectrum of AM wave or Frequency Domain Representation

2.7 Power relation in AM Wave

2.8 Types of Amplitude Modulation

2.9 Modulation by Several Modulating Signals

2.10 Generation of AM wave and AM transmitters

2.11 Angle Modulation

2.12 Frequency Modulation

2.13 Mathematical Representation of FM

2.14 Frequency Spectrum of fm or Frequency domain representation

2.15 Generation of FM wave and FM transmitters (FM modulators)

2.16 Pre-Emphasis and De-Emphasis

2.17 Comparison of Amplitude modulation and frequency modulation

3. Radio Receivers (AM and FM)

3.1 Introduction

3.2 Classification of Receivers

3.3 Characteristics of the Radio Receivers

3.4 AM Receiver Details

3.5 FM Receiver

4. Transmission Lines

4.1 Introduction

4.2 Equivalent Circuit of Transmission Line

4.3 Primary Line Constants

4.4 Secondary Line Constant

4.5 Losses in Transmission Line

4.6 Standing Waves

4.7 Quarter Wave and Half Wave Length

4.8 Impedance Matching

5. Antennas

5.1 Introduction

5.2 Antenna Fundamentals

5.3 Important Definitions

5.4 Resonant and Non-resonant Antennas

5.5 Dipole antenna

5.6 Different types of antennas

6. Wave Propagation

6.1 Introduction

6.2 Fundamentals of Electromagnetic Wave

6.3 Radiation and Reception Mechanism

6.4 Attenuation and Absorption

6.5 Propagation of Waves

6.6 Ionosphere and its Effect

6.7 Terms and Definitions