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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: MikeM54321 who wrote (9844)12/19/2000 11:28:57 PM
From: Natedog  Read Replies (1) of 12823
 
A brief history on wireless:

In 1880 A.G.Bell developed what is now recognized as the worlds first wireless communication system. He named this invention the "photophone" which used reflected sunlight and photoelectric selenium receivers to transmit a voice "signal" up to 700feet. Approximately nine years later, a german scientist named Heinrich Rudolf Hertz detected the presence of invisible force waves emanating for several meters around an electric spark of sufficient intesity. IN recognition of this discovery, the unit of measurement for the frequency of these invisible waves the most important concept in wireless communications, became known as hertz. In 1895, Guglielmo Marconi devised a method of transmitting Hertz' invisable waves over several Kilometers using antennas. He named this collective technology "radio" and to this day, systems that operate on this principle of transmitting and receiving invisible waves through an open medium are generally referred to as RF systems. Bell's "photophone" and Marconi's "radio" are both considered wireless methods of communication, even though the are based on substantially different technologies. Today, "wireless" has become a widely used term that makes general reference to communication methods that do not require a wired, or physical, medium to transmit information.

Now you know.. Try and find that one the net~

ps.visible light: 500,000,000,000,000 hertz (500thz)
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