antenna-theory.com

[cbradshw]

UPDATE: I have realized that Schumann resonance devices usually use a scalar wave producing coil (self canceling), not a regular wound coil (electromagent)
If you are interested in learning about the Schumann resonance there is a pretty good radio interview at:
http://www.youtube.com/watch?v=3Wak6wNSdTw&feature=BFa&list=ULlo0PqAYjsx8&index=18

Hello,
I've been reading up a lot about antennas for use with a simple sine wave oscillator that I've built (Wein-Bridge). The frequency of the device is configured to 7.83 Hz. To power the signal the output of the oscillator goes into an op-amp with a 2x gain for output to the emitter. These type of devices are commercially sold to recreate the Schumann resonance for persons that live in high metro areas and are flooded by the main 60 Hz power grid not to mention the RF and cell phone Ghz frequencies. The 7.83 Hz is known to be the pulserate of the planet (I know a bit new agey but stay with me please). One part of the devices that I intuitively didn't feel happy about is the choice of emitting the signal. Often the emitter design is just a coil loop of magent wire (either air core or soft iron). But would this pretty much make just an electromagnet and not provide any true power in form of radiating?
(I am also teaching myself electronics from a very good book so please bear with my novice approach. I have learned that a coil (inductor) in a series circuit will just store energy as magnetic and then dispel it for the rest of the AC wave)
Today I found this website and it has been a great treasure to find and learn about antennas. I especially like the section about the importance of balancing the output of coaxial feed. I like the simplicity of the spiral antenna (infinite balun). I would like to know if this antenna would permit my 7.83 Hz AC signal to radiate? I know with a frequency that low that there's no way to build a 1/2 or 1/4 or even 1/8 wave antennas. The length is just too long. Perhaps I could rethink things and make a 100MHz signal but have it pulsed or modulated (amplitude modulation) at the 7.83 rate. Is this more sensible?

You may need to Google about Schumann resonance generators to understand their purpose.

Cheers in advance,
Christopher

[bigSteve]

So I don't know of any antennas that can work at 7.8 Hz. That's the kind of thing where you'd need to use a gigantic structure (empire state building, golden gate bridge, etc) just to achieve the slightest amount of decent radiated fields from it.

Since traditional (efficient) antennas won't work for this application, a loop is a reasonable idea. Yes - it acts as an inductor. But inductance is essentially energy stored in the magnetic fields of a current carrying loop. The magnetic fields exist around the loop - and these fields can be detected by another such loop.

The fields die off quickly, and that means relative to a wavelength. however, since 7.8 Hz has an extraordinarily large wavelength, you may be able to get some decent loop-coupling at some distance away. How far are you trying to transmit?

[cbradshw]

Hello Steve and thank you for posting a response.

Yes it does seem far too impractical to try and use the long wavelength with an antenna. I only need a signal throw distance of 50-100 ft.

The Schumann resonance is the earth's magentic field that pulses at the 7.83 rate although they say that's it's increased to 12 over the years. Perhaps I should stay with the production of a magnetic field. But I recently learned that a coil's reactive energy does nothing for dissipation in the circuit for true power. It's only imaginary power.

Before looking into this antenna I was planning on building a bifilar wound coil with magnet wire and soft iron rod (1,000 turns). This electromagnet would produce the fluxuating field but I am concerned that the effective distance would be very short (much the way magnetic fields drop off with distance). I imagine that you would have to stay close to the coil to have it be effective.

Is it worth the idea to use a building's electrical ground wiring for introducing a signal? How about a building's steel chassis structure? I know this is quite the goofy project.

Peace,
Christopher

[Schubert]

No, it's not a goofy project. That's innovation. Trying to use urban structures to support low frequency radiation is awesome. Plus whatever you do is probably breaking some ground.

As for a building's structure or wire, that's a good idea. So the issue is you need two long conductors for low-frequency radiation (think the two arms of the dipole). So you can definitely place one arm of the antenna to a structure, but you'll have to find another long arm somehow that is electrically isolated.

[cbradshw]

Hello Schubert and thank you for the encouragement to stay with something that's a bit different.

Interesting that you mention using a building's structure as a dipole as I am near two corrugated metal buildings. I wonder if the connection to ground has any conductance problem to watch out for?

But anyway, the more important aspect I realized is that these resonance devices usually employ the use of a scalar wound coil, not a conventionally wound one. The goal would be to have standing waves. This is where it gets a bit fruity for the crowd of Jeff Rense and Art Bell.

You could simply take a long length of wire, fold it in half, and then coil it in a flat pancake fashion. This way the current starts out heading towards the center of the coil and then works itself back out. Tesla also drew up some bifilar designs but not for scalar. I plan to wind a iron rod bifilar and at one end solder the two ends together. Then start over at the other end and wind another layer and so one. All the layers link to the next layer in series for a total of about 1,000 winds. These type of devices are supposed to bring about an easiness of living in a thick manmade electrical grid and boy could I use some of that in the workplace I'm at.
Anyone have some thoughts about scalar energy?

I did find a pretty good radio interview about the Schumann resonance and it's now listed at the top of this thread.

Cheers,
Christopher