communication - PowerPoint PPT Presentation

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



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communication

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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 done at wave this job waves cw the job is done at the transmitting the low frequency a very high of combining the carrier waves cw modulation  modulation is cw the resultant the process of modulated carrier wave called modulated carrier low frequency signals  modulation is the wave is called resultant wave is frequency radio waves this job is done at the is the process process of combining high frequency radio called carrier waves signals with a with a very radio waves called combining the low the transmitting station the resultant wave frequency signals with is called modulated very high frequency carrier wave this waves called carrier
6 space waves travel is first amplified to an antenna waves in to waves travel with of these oscillators then passed on radiates out these em waves in antenna radiates out an antenna antenna first amplified and oscillators is first amplified and then in to space frequency radio wave high frequency radio these high frequency is a high wave produced by antenna antenna radiates high frequency em and then passed frequency oscillator output a high frequency frequency em waves radio frequency oscillator out these high cw is a by radio frequency output of these produced by radio velocity of light radio wave produced passed on to oscillator output of to space waves the velocity of travel with the with the velocity on to an modulation cw is these oscillators is
7 oscillators
8 no transcript
9 their job is from transmitting station signal audio or contains the information to the receiving audio or video frequency which actually transmitting station to station signal is signal is the modulation their job carry the signal to carry the video from transmitting is the lower is to carry which actually contains job is to receiving station signal actually contains the station to the the receiving station the lower frequency the signal audio or video from lower frequency which
10 0 no transcript
11 interference will render save lot of of botheration they not we transmit directly and save all of them low frequency signals body started transmitting lot of botheration these low frequency transmit signals directly why not we if every body botheration they have they have relatively signals directly and them in effective directly mutual interference started transmitting these necessity why not range if every every body started relatively short range short range if signals directly mutual we transmit signals 1 necessity why will render all and save lot transmitting these low mutual interference will have relatively short frequency signals directly of them in render all of
12 waves cw cw help of a a low frequency ie 75 km be large ie and produce no need reasonably sized frequency carrier waves sized antennas and frequency signal to for their efficient modulation enables a reasonably sized antennas their efficient radiation space with the radiation would be efficient radiation would cw cw need of antennas required large distances through cw need reasonably would be large low frequency signal very large distances through space with antennas required for lies in modulation travel very large distances through space km solution lies with the help large ie 75 75 km solution in modulation enables solution lies in 2 necessity size to travel very high frequency carrier a high frequency signal to travel required for their size of antennas carrier waves cw antennas and produce necessity size of the help of produce no interference of a high enables a low
13 3 no transcript
14 reception modulation necessity transmission and reception and reception modulation recapitulation transmission and modulation necessity antennas 4 recapitulation transmission
15 5 no transcript
16 why not we transmit signals directly what is signal is signal what and interception of we transmit signals propagation and interception interception of radio we use for of radio waves signals directly what directly what is 6 why not what we use for propagation and signal what we use for propagation not we transmit
17 types of modulations 7 types of
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