Rediscovering the radio

Discussion in 'Wireless & RF Design' started by Ioanp, Oct 19, 2015.

  1. Ioanp

    Thread Starter New Member

    Oct 18, 2015
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    I would like to retrace how radio transmissions came about. In other words, I would like to understand the math and physics behind it and possibly reproduce on my own wireless transfer of information and energy from point A to point B.

    Does anybody know if such a study already exists? If yes, where would it be?
     
  2. MikeML

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  3. crutschow

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  4. alfacliff

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    Dec 13, 2013
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    first came Maxwell, with the theory, then Hertz with the demonstration, then Tesla, Bose, Marconi and the rest. Also, Steinmetz with the math of how the spark transmitter actually worked.
     
  5. nsaspook

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    Aug 27, 2009
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    A large fraction of technical people don't consider Telsa as a very important character in the development of 'Radio'. His theories of large scale wireless energy transmissions were completely wrong because of his extreme skepticism of the Maxwell/Hertz concept of fields but his designs of high frequency (audio range) alternators lead the way for efficient RF generators later.
     
  6. alfacliff

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    tesla's most important contribution was the introduction of resonance and tuned circuits. marconi systems were basicly untuned extremely broadband spark transmitters and recievers. also, how about all those patents of tesla's that marconi violated when "inventing radio"?
     
  7. joeyd999

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    Are you trying to start a war?
     
  8. nsaspook

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    No, I just like to keep Tesla and his great contributions in their proper place. The man was an absolute engineering genius and deserves all the accolades he was given for his real accomplishments but his contribution to radio 'science' was minimal.
     
  9. alfacliff

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    in other words, engineers arent as good as "scientists"?
     
  10. nsaspook

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    A big fat No, just that Tesla wasn't in the development of Radio.
     
    Last edited: Oct 29, 2015
  11. Sparky49

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    How on earth did you jump to that conclusion?
     
  12. alfacliff

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    first off, Tesla built radio controlled boats long before marconi "invented" radio. Tesla was a colege trained engineer. and the remark that his contributions to radio "science " was minimal is incorrect., while most others were using untuned spark transmitters, he was using resonance, even modulation to control his boats. Marconi"s system used a ground, spark gap, and antenna as a transmitter, sometimes a capacitor across the spark gap, no tuning at all. basicly he generated some rfi at high voltage with an antenna to make it a bit longer range. tesla's system used a tuned primary, spark excited, inductivly coupled to a resonant secondary and antenna. he also experimented with high frequency alternators coupled to tuned circuits to transmit and recieve CW. one of his circuits used a small arc oscilator to hetrodyne signals in a reciever. arc exciters are better than spark, becasue they give a cleaner continous wave carrier, rather than the racous noise generated by a spark.
     
  13. nsaspook

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    http://earlyradiohistory.us/tesla.htm
    It seems a large number of people see 'Wireless' and think 'Radio'. The term of art 'wireless' as Tesla and many others at the time was not the far field electromagnetic radiation we commonly call radio waves today. The 'facts' speak for themselves on this matter.

    http://ieeexplore.ieee.org/stamp/stamp.jsp?reload=true&tp=&arnumber=1694723
     
    Last edited: Oct 30, 2015
  14. alfacliff

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    yes it is the same as we use now, just a bit improved, and different modulation methods. spark transmissions were inherently broadbanded but that was corrected by the advent of CW, continous wave, generated by first alternators and arc transmitters. the range improved with the cleaning up the spectrum used. modulation methods changed from simple of off keying to adding voice, first am then fm. digital modes started with RTTY sent as frequency shift keying, and fax over the air. the pioneers of radio did a pretty good job of getting the basics down for what was to follow. Tinkerers, inverntors, engineers, scientists, and mathemeticians all worked to "invent " radio as we know today.
     
    nsaspook likes this.
  15. nsaspook

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    Tesla talked about induction not transverse radio waves but I agree with the rest of your comments.
     
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