The prentice patents reference.

If I understand correctly, the receiver has no effect on the transmitter providing it is in the far field, at least two wavelengths.  All the devices we see have Tx & Rx in VERY close proximity - the reactive near field.  So the Rx will impact upon the Tx, which is why, I assume, the Rx/secondary must be tuned with the (unpowerd) primary present, in the position it will be used when powered.

That I am talking about!

This is transformer without Lenz's law!

  This is a classic example where your mind becomes blinded by what your eye's see. When this happens your mind starts to create a world that is divorced from reality. No sooner did you read the word 'No' a brick wall went up in your head. You refuse recognize anything else.

  You became enraged you took the attitude of 'How dare he respond with a simple no'. But do I really have to write an entire paragraph to explain the obvious? Amazing I simply write the word 'NO'  and automatically I’m recognized as being 'terse' and 'rude'. Not at one time does anybody point out that I end EVERY post I have ever written with the word 'RESPECTFULLY'. Who else show's this common courtesy? Do you see how your mind created a completely different reality because you did not read past the word No?

  I already posted a reply to your whole 'Copy/Paste' monologue. You did not like the response that both Don and I gave. You immediately thought we where stupid and that we needed your 'abridged version' to understand. My answer is still 'No'.

  What happens is this. When your mind can't figure out what is going on it automatically starts to compare it with 'things' it already knows. You and others refuse to realize truth. Since the 1950's to present day there have been literally thousands upon thousands of Tesla coils made. Just Google Tesla coil. These coils have been made by expert craftsman who took every detail into account. There is NOT ONE TESLA COIL, however professionally tuned, that has even yielded a hint to gaining free energy. NOT ONE! Why is this reality so hard to understand? Do you see how your monolog amounts to nothing but regurgitated words that do not add any substance to the subject of the thread.

  Let me ask you a question, I assume you already researched Tariel's device and have viewed the YouTube video's.

Question: What if everything you thought was right was wrong?

 Well this is where you start. This is a hard starting point for many people, if not all of use, because our minds refuses to re-discover a reality that it spent a lifetime creating. So many people have viewed Tariel's 'Green box' video, his first device, and automatically assumed Tesla coil. This happened because our eyes saw copper tubing wrapped around a coil and our mind then created the only reality it knows refusing to accept anything else. It is that same thought process that prompted the quote by the member above. The mind, simple refusing, quitting on you, to see the whole picture.

  I now challenge anybody, on any forum, to show me a Tesla coil that has the 'spark gap' wire running 'inside' the copper tubing. If you know of such a Tesla device please post information regarding it. If you do not believe go back and view the video. Tariel is extremely clever. The color of the wires, off the spark gap, are not by accident but by design. It is difficult to see the green wire against the green box. Also it is difficult to see a blue wire against a blue taped coil. So the closed mind will see a Tesla coil, this is the reality that Tariel attempts to create for you. The keen observer will see a completely different world with greater options.

  I ask again show me a Tesla device that has the spark gap wire running inside the copper tubing. Do I have any takers?

Respectfully,

Core

EVERY TC is under unity if you use resistor as load

@ Core,

Nice experiment man. By the way, the old book has its right in a way. Voltage can be considered that propagates as wave into conductors since an electrical pressure applied to one end of conductor pushes charges (like a series of metal balls) from end to end.

What the rubber band in the old experiment did is to nulify the conductive path. But what about the capacitative or displacement current?
Its the same case as "current" propagates via capacitors even though not conductive. At least it seems that way to me...

@ Freshcut...

Lets me explain myslef. I have not any formal EE degree neither posssess knowledge of contemporary EM, Wave, Antenna etc theory. My knowledge comes from basic electric circuits and basic electronic components study, as well as much of Tesla literature (as Colorado Springs notes) and a ton of experimenting so as pieces come together in a practical way infront my eyes.

Regarding the question you asked me
...

Note when working with HV HF not a single electronic equipment i can connect to circuits without damaging it. So, i see and judge based from what i see and have read.

A spark-gap in series with the HV source, will create a wide spectrum of noise some of it will be the resonant point of a parallel LC. BUT, when it comes to oscillation and its strengh it is very feeble and i can touch the coil or cap without harm. So, the Prentice /  Don Smith suggestion for a spark-gap is a WASTE of energy. Period. (unless you make an antenna).

On the contrary, the 2-3 outlines, create such strong oscillations (adjusting same SG breakdown), that with a power of 40w and a ground wire i can draw almost 0.2cm sparks out the primary in single terminal mode (standing alone isolated without closing circuit) Or in other words not even consdering at touching it!

...
Another thing that Don Smith makes wrong or Prentice does not mention is about the resonance mode.
Resonance of a High capacitance and small inductance (Don smith coils) is a feeble one and waste of energy.
The stronger or more efficient resonance is achieved with large inductance small capacitance. (fact)

SPECULATION WARNING
...............

Of course, noone knows whether the "earth currents that assimilate to the circuit themselves" according Prentice prefer a high voltage lesser amperage stronger resonance (hugh inductance small capacitance) or low voltage higher amperage (large capacitance small inducatnce).

So Kapandze and his "natura" frequency, assuming it works on this mode, he obviously makes a large capacitance low inductance resonance (large amperage).
Whereas Prentince in order to achieve some 100,000 volts and the receiving Closed Loop antena to work near the transmiting antenna by electrostatic coupling mainly, (those with Kacher experience will understand what I just said) will obviously required a large inductance, small capacitance circuit resembling more to a Tesla gear.


I think
.......
As most energy sources from the Nature must be come from an interaction of equipment and an open system, as photovotaics and SUN, Windmill and AIR, turbine and Hotspring, ocean turbine and OCEAN,  and in more specialized cases as ELevated capacity Tesla equipment and ground etc etc,
so our GEO system ala Kapandze style the machine is one part and the Nature's electrical "ability" is the second part.

Too much investigation has been given to hardware (since it can be done comfortably in a LAB without getting dirty ourselves) and little or no consideration to the source. From now on my moto will be "first recognize your energy source, and then make the machine to tap it"
No energy source, dead aparatus.

@ baroutologos
The problem with a spark gap in a LC circuit is that it completely modulates the circuit parameters, especially the Q factor, because the ionic channel between the 2 electrodes has a variable resistance from infinity to almost zero ohm, depending on the noisy HF current. This prevents a real resonance and thus will not be able to concentrate the spark gap current in a narrow frequency band.
A connection of the spark gap to the coil at an intermediary position (for example at a few turns, the majority of the turns being only connected to the capacitor) could greatly enhance the resonance. The inconvenient is that the spark gap becomes much less implied in the resonance and we are left with a conventional circuit, in which the LC circuit just selects a part of the spectrum signal provided by the spark gap, the other part being wasted.
I have no idea how to force the spark gap at a particular clean frequency which imho would be an interesting way for observing new phenomena possibly involved in Kapanadze's device.

@ baroutologos
The problem with a spark gap in a LC circuit is that it completely modulates the circuit parameters, especially the Q factor, because the ionic channel between th...

Speaking out of experience i know the cleanest resonance is given in a Kacher, where a transistor's base is directed connected to LC (tesla coil like).
I have achieved also to resonance  a LC (L variable till 400uH and C 2,4....20nF) clean, with a 555-timer pulsing a transistor, and all connected in the Odin Coil topology. (Primary is a part of secondary, but you pulse few last turns, see drawing. I have posted it before)

Honestly, i cannot see the problem you indicate with the spark-gap. Indeed SG resistance goes from open circuit to almost none. Also ionization is involved, but an LC circuit will resonate at its fundamental frequency as well as the signal will include other frequencies as well but seriously attenuated in comparison to main oscillation. (the R defines the Q not frequency)

In practice, the main problem with "shock excited" resonance of a SG and that of a Kacher is the fact that the first in same power levels demonstrates far more energetic behaviour but the action is intermittent whereas a Kacher will have a smooth uninterrupted resonance. (sparks can be 3-5 times longer, depending the SG breakdown, but an FL tube demonstrates the nature of the resonance)

Also i believe the break of a SG at irregular intervals (except is a rotary one) and in case in the meantime the secondary's LC oscillation has not stopped, may "conflict" even though i lack the equipment to say definitely.

...
Anyway, today's solid state devices are good enough for replacing SGs etc, but i think they are two equally valid ways. In any case, the patents examined date way back from the discovery of solid state components.

ps: @  Above,

Cannot say really if the 3 require more power. It seemed to me more "efficient" judging with the eye the output of a Tesla coil.

*pls remove*