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I was reading about how radios work and I came across a line I didn't understand on this page:
http://electronics.howstuffworks.com/radio9.htm
Is it just inductive coupling ( http://electronics.howstuffworks.com/wireless-power1.htm )? If so, how? I thought that needed a closed loop. Is it something else?
http://electronics.howstuffworks.com/radio9.htm
Your wire antenna is receiving all sorts of radio signals, but because you are so close to a particular transmitter it doesn't really matter. The nearby signal overwhelms everything else by a factor of millions. Because you are so close to the transmitter, the antenna is also receiving lots of energy -- enough to drive an earphone!
Is it just inductive coupling ( http://electronics.howstuffworks.com/wireless-power1.htm )? If so, how? I thought that needed a closed loop. Is it something else?