Dr Ronald Stiffler SEC technology

[itsu]

Okay, what the field strength indicator shows as an ever increasing voltage amplitude up to the top of the 2nd L3 coil seems convincing: you have the quarter wave resonance, when the two coils are not wound continuously into a single continuous winding but a certain separation splits it up into two separate windings. 
I noticed as if the field strength around the 1st L3 coil reduced, when you shorted the 100 Ohm: your VU meter did not show the half scale deflection at the end of the 1st L3, maybe you did not touch the diodes wire to the enamelled (i.e. insulated) coil wire close enough like earlier? But when you continued to the start of the 2nd L3 the half scale deflection returned. You surely checked this more than once that in this respect the resistor has no (visible) role.
You may have checked this also when did the frequency sweep with the tracking generator I suppose, in theory the 100 Ohm may reduce the Q quality factor of the two coils.
By the way, the two peaks are interesting and are rather far from each other, where do they come from, what creates them? If you space the two coils at a higher distance from each other, do these peaks change in frequency? Or you insert a ferrit piece into one of the coils do the peaks change?  Sorry to advise some further tasks for you...   
Thanks for all you are doing.
Gyula

Gyula,

yes there are numerous variations possible to test for in this small setup, and i am doing a lot but not all reporting
them as that would make even longer boring video's.

My little AVU meter (as verpies called it) is very sensitive for keeping the correct distance to the d.u.t., so it will
fluctuate when not doing so.

The 2 peaks visible on my SA are reasonable "fixed", the high one around 23MHz "moves" the most as to be expected
when spacing etc. the 2 coils.

What i noticed before is that an unloaded L3 coil is (self)resonating? around this 22MHz (on the boundery of my FG
20V amplitude range which is at 20MHz).
The load will pull that down to our 13.6Mhz or so.

I will do some further tests with a single and double L3 only using this SA/TG setup.
Not sure if the Doc is able to go beyond 20Mhz as his shown FG (Wavetek 191?) seems to have that as its upper limit.



lidmotor, thanks for the vid, i had seen it before, now we wil try to reach that distance without any wires.

Slider,  nice outdoor demo, it shows that things are not that simple as expected.  seems the ground is really
absorbing all the RF.

Itsu

[erfandl]

Tuned resonant inductive coupling:
https://www.youtube.com/watch?v=gi-hl2W86yk
https://www.youtube.com/watch?v=MhBgAAJUPsw
https://www.youtube.com/watch?v=G5wbyAwgeO8

and the circuit ?

[itsu]

Hmmmm,  it seems that the last 2 video's from Dr. Stifflers YT account are removed.


Itsu

[Lidmotor]

Itsu and All ---- I think Doc pulled the two videos because he realized that it was going in the wrong direction.   We did this experiment years ago back in 2009 but we used an earth ground in the normal fashion and transmitted through the air.  I got about a 2ft. distance of wireless transmission.  Brad you made a comment on this video (about 12 comments down) that you had done a similar experiment using just a 'plasma globe' as the transmitter and got 3 ft.  The reason Doc might be revisiting this is because of the LED Cree board he has and he wants to see how that performs. Just my guess. I still have my towers that I used back then so I can replicated this experiment rather easily using the new LED AL backed arrays we are trying out. 
  Here is my video from 2009 where I used an earth ground the traditional way: https://www.youtube.com/watch?v=ZbN2lD1BOvU&t=40s

---Lidmotor

[itsu]

Lidmotor,  thanks for the explaination,  we will see what comes next then.




Showing the (self)resonance frequency of an L3 coil using my FG and scope (23Mhz) see video below.

I also tested this coil and the double L3 coil setup using again my SA/TG combo.

it seems that the earlier noticed 3mhz peak comes from the (Schottky)diode ring and/or the ledstrip, because when removing
them from the D.U.T this peak is gone.

So we are left with the 23mhz peak when measuring across 2 L3 coils (+ 100 Ohm resistor) in series.
When removing the 100 ohm resistor, the peak changes to 25Mhz.

Removing also the 2th L3 coil from the D.U.T., then the 23/25mhz peak is gone, see video:

https://www.youtube.com/watch?v=FhGx8TYs0Iw

A similar situation is seen but with different peak values when using the 1N4148 diode ring.
The first peak will be around 11Mhz while the second peak is 26mhz (2x L3 coils with 100 ohm resistor inbetween).

Removing the 1N4148 diode ring with ledstrip, this frist peak is gone, and the second peak is moved to 22Mhz.

Perhaps the 50 Ohm load of the SA/TG is to much for the selfresonance to manifest on a single coil.

Itsu