Communication system class 12 physics revision notes, class 12 physics chapter 15 , now 14 - revision notes pdf by blue sky pcm, blue sky posts . Youtube video - watch video PDF FILE -- Pdf file topics covered---- definition of communication system block diagram of modern communication signals, transmitter, receivers, communication channel, bandwidth,no. of channel, noise, transducer, attenuation, amplification, range, baseband, repeater, modulation,mode of communication. point to point point to many earth's atmosphere propogation of EMW types of modes of propogation. ground wave propagation, sky wave propagation, space wave propagation,line of sight, satellite communications, ionosphere, troposphere, transmitter receiver, critical frequency,skip distance, fading, modulation,need for modulation, types of modulation amplitude modulation frequency modulation phase modulation. expression for amplitude modulation side bands., upper side bands, Lower side bands,band width
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