radio communication

Marconi has some competition in developing radio-communications

search – Aleksander Stepanovich Popov

May 7, 1895 – Mr Popov sent a message from a Russian Navy Ship 30 miles out to sea, all the way to his lab in St Petersburg, (Russia)

WIKI-Ver; – ‘he effected ship-to-shore communication over a distance of 6 miles in 1898 and 30 miles in 1899.’

http://en.wikipedia.org/wiki/Alexander_Stepanovich_Popov

*sine wave*

 

FROM-URL: - http://www.wifi-doc.com/
Cisco.Press-802.11.Wireless.Ne/1587051648/ch02lev1sec1.html -

Frequency

Back in 1864, the Scottish theoretician James Clerk Maxwell first
developed the idea that electromagnetic waves arose as an electric
current and changed direction. 

In the 1880s, Heinrich Hertz used this idea to develop the first
RF device that sent and then received electromagnetic waves over
the air.

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