Dr Ronald Stiffler SEC technology

[gyulasun]

Nick,  okay on the as high as even 100V from the crystal oscillator but let me ask: what DC voltage amplitude would be needed for your LEDs to get what you consider already as full brightness, did you check it too?  Your 10 LEDs in series may need say 31 - 33 V DC to operate with full brightness from a DC supply I would think and then the current draw would be say around 15-20 mA ? (If you check this, make sure to use a few kOhm resistor in series with the LEDs to protect them from extra current draw.)

Now I assume that when you use an L3 coil that creates the near field (rather than the choke coil in the collector), then you make sure that the L3 coil should be spot on the crystal frequency, otherwise the use of L3 has not much advantage. You surely know that anything near to L3 may detune it. And if you use a ferrite piece to fine tune L3 then the core material should have low loss at the crystal frequency. RF powder iron toroids could be used if you slip them close next to each other onto a piece of plastic or wooden rod. Such RF toroids I mean:
https://www.ebay.com/itm/282774499025  and data sheet http://toroids.info/T50-6.php
Of course these cores when you push them into an L3 coil, then L3 in itself should have already a higher resonant frequency than the crystal frequency so that the cores could reduce the original coil frequency. Also, when any so called 'top load' is connected to the floating free end of L3, it also reduces coil frequency, so the use of the cores should be considered accordingly, may be some turns should be removed. Sorry if you know all these fine tuning details though, and your thought on the match between the oscillator and L3 coil is correct.

The energy to light the LEDs should come from the RF field the L3 coil produces from the oscillator. Unfortunately, this is a lossy conversion process: one is the DC input to the oscillator (oscillator conversion efficiency), the other is (radiation efficiency of L3) the field of coil L3 is all over in its vicinity in quasi every direction in the near space i.e. the field is not concentrated solely for the LED boards and / or LED wires, it is spread over in quasi every direction, the strongest field being around the top end of the coil where the voltage maximum should be.

Itsu, Many thanks for checking the two loop currents, that is how I thought.

Gyula

[mikrovolt]

The signal transistor such 2N5179 make great oscillators however we can modify an oscillator for good transfer using a ferrite torus which allows the density of
the magnetic flux to build which is like a very efficient small dynamo.

The power transistor now has what it needs to amplify. The 2N7000 has been shown to improve efficiency in D or E class mode. It was a good suggestion
made earlier here. In some cases found 40 % increase. By not over driving the signal transistor, simply moving the mA to the power transistor.

I was very excited about the latest video on bidirectional loop in fact could not sleep, a lot of possibilities. The ongoing projects are also making great progress paving the
way, we will definitely be seeing better designs coming up.

[Slider2732]

The latest video has piqued interest:
https://www.youtube.com/watch?v=66KTJGlbKmM

Dr. Stiffler is using a 12V SLA, a SEC circuit, a couple of L3's, a 100ohm resistor, the diode loop and the Cree board.

What I like is the description underneath:

Doing final check on the parts to be used in the loop distance test. There will be no single wire, test will be through the earth only.

Outdoors through the earth...exactly what many have been stuck on, including myself most frustratingly for years.

[Lidmotor]

Slider--When I saw Doc's latest video I thought of you right away.  We have been stuck on this idea for years and years.  I made a video of a single wire feed off a SEC to start getting up to speed with what Doc is now doing.  A number of people are commenting on how the "Stiffler Loop' works and one guy thinks that it is basically a 'Ring Modulator'.  The more I look into it the more I like that theory.  Here is the video I did today on my one wire feed.  It deals with how the link to the Loop is done.
https://www.youtube.com/watch?v=_zR7gHDpqbM

   Here is the basic 'Ring Modulator' circuit:

Cheers--Lidmotor 

[Slider2732]

I agree about the Ring Modulator. It immediately made me think of synthesizers, having built analog types and their component circuits in the past.
Looking around, yep, same thing here: http://www.usefulcomponents.com/main_contents/projects/simple_ring_mod/simple_ring_mod.html
It would perhaps be interesting to throw different frequencies through, but with a dozen 1N4148's. Was thinking a couple of years ago about using blocking oscillators and other circuits we work on within music....strange music maybe 

If the Doc gets further than 6" from source to receiver outdoors, then my eyebrows will be on the ceiling !

Now to view your vid