https://www.youtube.com/watch?v=RLczNzWBbpE

What happened to “cavity”?
Supposed to be “Schumann CAVITY Resonance”. The so-called ionosphere is not exactly any boundary to any cavity. Perhaps it is the same as that invisible, mysterious wall in a restaurant that divides the smokers tables from the non-smokers.

“Resonance” isn't exactly “good”. If it is not CONTROLLED resonance, it destroys. If you are “resonating” with something, that is an indication you are not IN PHASE with it. You are not IN SYNC with it. You are not VIBRATING WITH IT. You are close, but not exactly in phase with that something you are “resonating” with. If you are at that point, don't stop and keep “resonating”. Achieve IN SYNC VIBRATION!

As it is stated in one of the comments in the link above, the Schumann Cavity Resonance” frequency is relatively stable, only the AMPLITUDE changed or “spiked”. Big deal! So, what! It doesn't mean anything significant, only to those who want to make believe.

How does a spike materialize in a frequency?
It can't happen on its own. Most of the times, spikes occur because of ANOTHER frequency was introduced. Basically, when the fundamental frequency approaches its highest amplitude and another frequency is introduced at that exact location and its amplitude getting higher, the two amplitudes will add together, creating a “spike”.

This is also true the other way. The amplitude of the fundamental frequency can be subtracted by the introduced frequency, if it is diminishing.

To be able to accurately KNOW what is going on, a spectrum analyzer is needed as oscilloscopes are totally useless to find the introduced frequency. Anybody, who is using oscilloscope to prove changes in the Schumann resonance is either ignorant or want to con you. Giving you the last demon out of Pandora's box. Hope.

By the way readers, did you notice the kid in the above link winked around the 11:00 time mark?

Are the “illuminated ones” sending kids to make you believe their hogwash?
Very convincing, as you can see from the replies. A successful con MUST be believable, look genuine and innocent.

How does the Schumann Cavity Resonance wave-form look like?
Is it sine, square, triangle, saw-tooth?
What is the shape of it?
Again, if the resonance is uncontrolled, it will destroy itself.
Who or what controls the Schumann Cavity Resonance?

Personally, I think there is a lot of hogwash going on about this. Trying to explain it (if it really exists) but unable. Giving people the impression they know what it is. Even they call it a “phenomenon” and don't censor it.