Principles of Communication System:
Basic constituents of communication system. Need for using high carrier frequency. Classification of RF spectrum.
Classification noise. Addition of noise due to several sources. Signal to noise ratio. Noise figure. Modulation theory: Definition, types of modulation: AM, FM. Mathematical expressions of AM, FM and signals, Comparison of frequency modulation and Amplitude modulation. Pre-emphasis and de-emphasis. Wide band FM and narrow band FM. Stereophonic FM Multiplex system.
Linear modulation, Square-law modulation. DSBSC and SSB modulators. Demodulators. Diode detector and balanced modulators as demodulators. FM modulation using VCO and varicap diodes. FM demodulation using the phase licked loop, ratio detector and discriminators, Transmitter, Receiver.
Radio wave propagation:
Different types of radio wave, propagation lonosphere, Vertical height and critical frequencies of layers, Propagation of radio wave through ionosphere, Reflection of Radio wave, Skip distance and MUF, Fading, Static and noise, Antenna concepts, Two way communication. Principle of rudder, Principle of satellite communication.
Telegraph & Telephony System:
Introduction of telephony system, Telephony dials, transmitters and receivers, signaling and transmission of telephony, STD system, digital switching system.
Monochrome and color TV:
Introduction to TV, TV transmission fundamentals, Scanning and synchronization, Composite video signals.