Each Chapter terminates in multi-choice self-testing questions, numerical and review questions given at the end of each chapter. These questions can go a long way in helping readers preparing for the UPSC engineering services examination or any other competition. A glance at the contents reveals that the book is logically subdivided into a number of chapters. The first three chapters introduce the principles of communication, noise and modulation which are later used throughout the remaining part of the book. The next four chapters deal with various types of modulation methods - amplitude, frequency and radio transmitters. * Principles of Communication System * Noise * Types of Modulation * Amplitude Modulation Methods * Amplitude Demodulation * Radio Transmitters * Frequency Modulation Transmitters * Transmitter Power Supplies and Tube Cooling * A.M. Receivers * F.M. Receivers * Antennas * Propagation of Radio Waves * Ultra High Frequency Tubes and Oscillators * Principles of Radar * Principles of Television * Television Broadcast Studio * Television Transmitters * Broadcast Television Receivers * Colour Television Receivers * Satellite Communication * Pulse Communication * Optical Communication System.