8432Re: [loopantennas] Re: What type of capacitor is used for loop antenna?
- Apr 2 8:35 PMCool! I had not heard of this, and found the paper very interesting.
Thanks for sharing the link.
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
>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
>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
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