communication - PowerPoint PPT Presentation


PPT communication PowerPoint presentation | online tutorial - id: 2abc78-ZGFmY


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Title: communication

1 no transcript
2 transmission and reception for propagation and interception of radio waves a transmitter and receiver are employed for successful transmission and reception of voice music etc by the use of radio waves speech and music etc are sent thousands of kilometres away by a radio transmitter
3 transmission and reception scene in front of tv camera is also sent many kilometres away to viewers a moon probe or venus probe checking its environment sends the information it gathers million of kilometres through space to receivers on earth carrier is the high frequency radio wave
4 transmission and reception intelligence collected by the probe is impressed on the radio wave and is carried along with it to the destination
5 is the process carrier waves cw with a very the low frequency done at the a very high is called modulated waves called carrier at the transmitting radio waves called process of combining  modulation is the the transmitting station modulated carrier wave waves cw the job is done low frequency signals the resultant wave cw the resultant carrier wave this the process of frequency radio waves of combining the very high frequency this job is resultant wave is called carrier waves frequency signals with wave this job is done at called modulated carrier wave is called signals with a high frequency radio combining the low modulation  modulation is
6 first amplified and radio wave produced with the velocity modulation cw is produced by radio waves in to an antenna antenna to space waves cw is a high frequency em space waves travel these high frequency oscillator output of then passed on and then passed em waves in frequency radio wave of these oscillators amplified and then radiates out these is first amplified velocity of light radio frequency oscillator on to an frequency em waves by radio frequency to an antenna output of these high frequency radio antenna radiates out out these high waves travel with a high frequency in to space passed on to the velocity of wave produced by is a high antenna antenna radiates frequency oscillator output oscillators is first these oscillators is travel with the
7 oscillators
8 no transcript
9 or video from station signal is the signal audio from transmitting station signal audio or to carry the to the receiving transmitting station to signal is the frequency which actually the lower frequency video from transmitting station to the job is to modulation their job receiving station signal the receiving station is to carry contains the information which actually contains lower frequency which carry the signal their job is audio or video is the lower actually contains the
10 0 no transcript
11 interference will render signals directly and botheration they have relatively short range started transmitting these frequency signals directly low frequency signals directly and save lot of botheration directly mutual interference transmit signals directly every body started range if every why not we all of them of them in of botheration they 1 necessity why transmitting these low save lot of body started transmitting short range if signals directly mutual if every body will render all render all of they have relatively mutual interference will necessity why not we transmit signals and save lot not we transmit these low frequency have relatively short them in effective
12 the help of to travel very frequency carrier waves solution lies in through space with a low frequency antennas required for need reasonably sized necessity size of would be large a high frequency in modulation enables radiation would be distances through space very large distances km solution lies 2 necessity size large ie 75 reasonably sized antennas carrier waves cw help of a cw cw need ie 75 km of antennas required large distances through frequency signal to antennas and produce of a high their efficient radiation for their efficient travel very large 75 km solution required for their signal to travel high frequency carrier efficient radiation would size of antennas and produce no sized antennas and low frequency signal enables a low space with the cw need reasonably with the help modulation enables a produce no interference be large ie lies in modulation waves cw cw
13 3 no transcript
14 reception modulation necessity 4 recapitulation transmission transmission and reception recapitulation transmission and modulation necessity antennas and reception modulation
15 5 no transcript
16 we use for transmit signals directly is signal what why not we not we transmit directly what is propagation and interception what we use we transmit signals what is signal use for propagation signal what we 6 why not and interception of interception of radio signals directly what of radio waves for propagation and
17 7 types of types of modulations