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8434Re: [loopantennas] Re: What type of capacitor is used for loop antenna?

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  • Steve, g4vbd
    Apr 3, 2011
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      Hi Jerry
      there is also a Yahoo group for ELF and ULF who talk obout the Schumann,
      take a look at

      http://tech.groups.yahoo.com/group/ulfelf/
      There are plenty of papers, designs and results here

      regards
      Steve, g4vbd


      On Sun, Apr 3, 2011 at 4:35 AM, Jerry Flanders <jeflanders@...>wrote:

      >
      >
      > 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]
      > >
      > >
      > >
      > >------------------------------------
      >
      > >
      > >If you've got links, post them in the Links section!
      > >http://groups.yahoo.com/group/loopantennas/links
      > >
      > >Post files here. If the file comes from a website, please put it in
      > >the Links rather than uploading the file.
      > >http://groups.yahoo.com/group/loopantennas/files
      > >
      > >You can now view images at higher resolution in Photos. Upload JPG
      > >and GIF into Photos. Please convert BMP or TIF to JPG or GIF before
      > uploading.
      > >http://ph.groups.yahoo.com/group/loopantennas/photos
      > >
      > >And please trim all this when replying!Yahoo! Groups Links
      > >
      > >
      > >
      >
      >
      >


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