Summary, Concept Map

SUMMARY

• The basic elements required for the transmission and reception of a signal through long distance using electromagnetic waves are transducer, amplifier, carrier signal, modulator, power amplifier, medium of transmission, transmitting and receiving antenna, demodulator, detector.

• For long-distance transmission, the baseband signal is modulated with the carrier wave.

• If the amplitude of the carrier signal is modified with the instantaneous amplitude of the baseband signal then it is called amplitude modulation.

• The frequency of the carrier signal is modified with the instantaneous amplitude of the baseband signal in frequency modulation.

• The instantaneous amplitude of the baseband signal modifies the phase of the carrier signal keeping the amplitude and frequency constant is called phase modulation

• The height of the transmitting and receiving antenna must be a multiple of λ/4.

• If the EM waves transmitted by the transmitter glide over the surface of the earth to reach the receiver, then the propagation of EM waves is called ground wave propagation.

• Electromagnetic waves radiated from an antenna, directed upwards at large angles gets reflected by the ionosphere back to earth is called sky wave propagation.

• The process of sending and receiving information signal through space is called space wave communication.

• The satellite communication is a mode of communication of signal between transmitter and receiver via satellite.

• Fiber-optic communication is a method of transmitting information by sending pulses of light through an optical fiber.

• Radar basically stands for Radio Detection and Ranging System. It is one of the important applications of communication systems for remote sensing.

• Mobile Communication is used to communicate with others in different locations without the use of any physical connection like wires or cables.

• GPS stands for Global Positioning System that offers geolocation and time.

• Communication technology is used extensively in sectors like fisheries, mining, and agriculture.

CONCEPT MAP