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8432Re: [loopantennas] Re: What type of capacitor is used for loop antenna?

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  • Jerry Flanders
    Apr 2 8:35 PM
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      Cool! I had not heard of this, and found the paper very interesting.

      Thanks for sharing the link.

      Jerry W4UK

      At 11:06 PM 4/3/2011, you wrote:

      >Yes, there is a weak signal at 7.83 Hz that's caused by the resonance of
      >the Earth's magnetic field. It's been a while since I've done any
      >reading on it but if I recall it's thought to be powered by the Solar
      >Wind. Some New-Age types refer to it as "Gaia's Heartbeat" and I recall
      >seeing portable recievers marketed to the "Earth Change" people in the
      >1990s. I see the 2012 true believers have decided to adopt it as a sign
      >now too, not to mention the Zero point energy protagonists.
      >
      >I misremembered the exact frequency, I thought it was 6.8 so I looked it
      >up. Hey, after 20+ years a 1Hz drift isn't bad for an old analog unit
      >like myself ;) It's called the "Schumann Resonance" if you want to read
      >up on it on the WWW. Note that most of the search results point to what
      >I consider Kook-n-Quack sites. PDF from Scientific source
      ><http://www.hese-project.org/hese-uk/en/papers/schlegel_schumann.pdf> is
      >the best I found on a quick search.
      >
      >Submarine coms use multiples of that resonance, I think the FSK I picked
      >up was the 11th and 13th harmonics. Kinda like coupling to a spherical
      >resonance cavity at odd multiples
      >
      >I wasn't paying much attention to any frequency shift but the amplitude
      >varied over about a 2:1 range over a 2 or 3 month period. Never looked
      >into it as far as being affected by Solar storms or flux density. It's
      >not something I spent a lot of time on, just wanted to see if I could
      >pick up EMF at that low a frequency, there was no attempt made at
      >calibration and things like dew on the ground may have affected my
      >measurements.
      >
      >I recall seeing something about local disturbances in the signal right
      >before earthquakes and the harmonics used for lightning detection, there
      >may be other applications.
      >
      >On 4/2/2011 20:19, Jerry Flanders wrote:
      > >
      > > At 10:08 PM 4/2/2011, you wrote:
      > > >I did some work with VLF/ELF years ago, 60KHz and down to 6.8 Hz.
      > > ><SNIP> 6.8Hz is the resonance of the Earth's
      > > >magnetic field, vertical with a capacitance hat, or a big loop laying on
      > > >the ground with low noise audio/instrumentation optimized op-amps with
      > > >filtering/amplification and you can watch it on a scope but it takes
      > > >DAYS to see changes in signal.
      > >
      > > You can actually see an "earth resonance" signal?
      > >
      > > What causes it?
      > >
      > > What changes did you see in it - freq?
      > >
      > > Jerry W4UK
      > >
      >
      >
      >
      >[Non-text portions of this message have been removed]
      >
      >
      >
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