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• 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.
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