ELF extremely low frequency

Discussion in 'Wireless & RF Design' started by _Ozgur_, Dec 15, 2010.

  1. _Ozgur_

    Thread Starter New Member

    Dec 15, 2010
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    Hi Guys,

    As you know high frequency microwaves are subject to rain fade and atmospheric attenuation.

    When it comes to extremely low frequencies (3 to 300Hz), even a Faraday cage is unable to block it. Is there any material or phenomea which attenuates, absorbs or reflects these signals. For example, rainfade for high freq. microwaves and an analogical phenomena for extremely low frequencies.

    Kind Regards.
     
  2. blueroomelectronics

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    Jul 22, 2007
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    Tinfoil hat?
     
  3. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    To transmit an ELF signal, the Earth itself is used as the antenna load due to the insane wavelength.

    There are only a few ELF transmitters, mostly for submarine communication. What needs to be blocked?

    The 50/60hz of line power radiates several orders of magnitude more EMI than any ELF transmitter.
     
  4. _Ozgur_

    Thread Starter New Member

    Dec 15, 2010
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    Well, I have future projects for brainwave frequencies which are between 2-30 Hz. The environment must be void of these low and weak frequencies emitted from other living beings or natural phenomena like lightning. Believe or not, your brain waves are circulating all over the world via reflection of ionosphere, these EM signals, even weak, is never lost.

    What I am looking for is a material which can absorb, reflect, or attenuate these signals or the most important is the rainfade analogy, if rainfade for high freq. microwaves exits, there must be an equivalent phenomena which can fade or attenuate ELF (up to 30 hertz) ?
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Even if that is the case, how do you tune to one brain wave out of billions? What is the potential significance? The majority of activity is involved with keeping up homeostasis, so the signals operate muscles.

    Have you found a filter that can distinguish a thought from a command to cross your legs? Has anyone yet found a way to describe a thought process?

    A far as shielding - that 30 Hz is a nice harmonic of out 60 Hz powerline frequency. It's lucky that a Faraday cage does work at least that low - http://en.wikipedia.org/wiki/Faraday_cage
     
  6. jpanhalt

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    Since that assertion is fundamental to your entire thesis, can you provide any citations from recognized authorities that support that?

    John
     
  7. thatoneguy

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    Well, that explains the "Collective Unconscious".
     
  8. R!f@@

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    what about Magneto's hat. It can definitely block brain waves.
     
  9. tyblu

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    Nov 29, 2010
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    Perhaps your research could first concentrate on how to block ELF waves.
     
  10. blueroomelectronics

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    Told you. Tinfoil hat.
     
  11. thatoneguy

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    Yeah, the wiki article on it has a lot of additions and removals about this, sometimes calling 1-30kHz "ELF".
     
  12. bertus

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  13. thatoneguy

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    I really do not understand how people lump ELF and HAARP together.

    HAARP=High Frequency Active Auroral Research Program

    The location of the HAARP array does not allow for an ELF transmitter due to earth/dirt/rock composition. The antennas are nowhere near the size needed for anything in the kHz range, let alone sub-kHz.

    ELF is 3-30Hz. Any use of that phrase outside that definition is tinfoil hat.

    If it is harmful, people are killing themselves when wearing earbud headphones.
     
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