TOUCHING THE EXTREME WORLD OF TELECOMMUNICATIONS

More than 100 years ago were made several important discoveries involving the related phenomena electricity and magnetism. In 1856 James Clerk Maxwell further developed Faraday's concept of magnetic lines of force and expressed the theory that electrical energy existed withing the universe in the form of oscillating waves. He further suggested that not only did these electrical waves travel at the same speed as light but also that the waves were physically related to light itself. This gave rise to theories in electormagnetism. Below is the electromagnetic spectrum. 

    3Hz - 30Hz       Extremely Low           ELF     Submarine Communication

   30Hz - 300Hz      Ultra Low               ULF     Submarine Communication

  300Hz - 3kHz       Infra Low               ILF     Baseband Telephony

   3kHz - 30kHz      Very Low                VLF     Telegraphy

  30kHz - 300kHz     Low                     LF      Navigation and Radio

 300kHz - 3MHz       Medium                  MF      AM Broadcasting

   3MHz - 30MHz      High                    HF      AM World-Wide Radio

  30MHz - 300MHz     Very High               VHF     FM Broadcasting
 
 300MHz - 3GHz       Ultra High              UHF     TV Broadcasting

   3GHz - 30GHz      Super High              SHF     Radar & Satellite Comm.

  30GHz - 300GHz     Extremely High          EHF     Radar & Radio Astronomy

 300GHz - 3THz       Tremendously High       THF     Research

   3THz - 30THz      Infra Red               IR      Optical Communication

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