Blog Post #4 - Radio
For centuries humans have found ways to communicate with each other over long distances. From smoke signals to horns and more. Radio is one of humanity's greatest breakthroughs. Enabling people to listen to and communicate with other people, and have the privilege to now be able to use it for our personal enjoyment. To figure out the origins of radio first we need to go back to the 1820s to the discovery of electromagnetic waves. The brilliant mind that discovered this phenomenon was none other than Christian Oersted. Christian Orestead was Born on August 14th 1777, he was a chemist and a physicist. He discovered that an electrically charged wire can trigger a reaction to a compass needle. This would kick off the electromagnetic theory from Christians discovery. This Theory developed by James Clerk Maxwell, describes the electromagnetic theory as a collectively unified theory between electricity and magnetic fields that they are essentially the same phenomenons however they are different manifestations and contin different properties from one another. Christian in 1806 became a professor at the University of Copenhagen where he conducted physical research with electrical currents and acoustics. It was during a lecture that Christian had observed a needle facing perpendicular to an electrically charged wire. This is where the supporting evidence of his theory of magnetic fields came forth from. All of this was just a step closer to a larger picture and deeper understanding that would allow us to enjoy the revolutionary invention we have today.
Fast forwarding to the 1880’s, Heinrich Hertz makes a discovery that is very crucial to harnessing radio waves and understanding how they work. Heinrich discovered this phenomenon through an experiment where he had used a spark gap that had been attached to an induction coil. Heinrich had followed laws layed out previously displayed and discussed by James Clerk Maxwell. During the experiment when he had applied a high voltage charge afterward he had observed a spark that traveled across the gap between what looks like two metal spheres. This created the first standing recorded radio waves.
The year now is 1893 and all the fundamental pieces have been tested and discovered to harness radio waves. Guglielmo Marconi was the first to make a wireless radio telegraphy system in England. He had sent a Morse code message to a receiver from over a kilometer away. With this this opened the door for further development of the system. The development of low frequency radio waves had allowed for longer, more connected radio transmissions and messages. The development of radio towers has also been a major advancement in radio allowing for clarity in radio broadcasts and the ability to broadcast radio internationally and nationally. Last but not least a major development that has allowed radio to be so effective when it comes to transmitting are satellites. Now we can listen to radio on our phones in our vehicles and in remote areas with the right equipment. radio has evolved and changed to fit audiences around the world and is used in so many fields and expertise. We use radio for entertainment purposes, military, news, and many more.
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