Hendershot Replications

[morpher44]

200Khz?

Measurements of my coils:
Left (uH) Right (uH)
L4=81 L4=81

81uH ... interesting...

I was reading this over:
E E RICHARDS - Earth Power Spectrum

and have some observations to make..

Keely liked 42.8Khz -- law of harmonics
Tesla experimented with 40hertz up to 200Khz...
Hubbard had 1200 foot aerials, each arranged on the
cardinal points of a compass. That works out to be
4 quarter-wave aerials for the 205Khz.
Hans Coler: 180Khz

On my oscilloscope, I see a periodic burst (received best at night)
with a period of approx 5uSec (200 to 209Khz).

I see that many north American beacons are in this 200khz range.

Now for the fun part...
If we assume the tank circuit has 7.8nF ... and L4 is 81uH.
The resonant frequency would therefore be
200Khz
with series Q = 68 (or better if resistance < 1.5 ohms).

Is 200Khz related in some way to the magnetic field lines
as they rotate around the planet?

[mlurye]

Cool. Got any photos you can share of your caps and coils ?

Here is my setup. I don't have buzzer yet. And my transformers are not good

[mlurye]

Because of bad transformers I've got different resonance frequencies for left and right side. Left resonates at ~3MHz, right at ~3.4MHz. In resonance I can get 2V in place of buzzer. If I will balance left and right side it should go higher.

[NOMDI]

Here is my setup. I don't have buzzer yet. And my transformers are not good

Very nice coils, congratulations !

Do you have any link of the paper in oil caps you used ?

[mlurye]

Very nice coils, congratulations !

Do you have any link of the paper in oil caps you used ?

NOMDI you can use any MW cap.

[mlurye]

I noticed interesting thing about hand made caps.
I was measuring capacitance of both caps with different frequencies.
With 100Hz and 120Hz it mesures ~7.8nF.
With 1kHz ~5.9nF. (Both caps showing same result)

[morpher44]

capacitor change

I noticed interesting thing about hand made caps.
I was measuring capacitance of both caps with different frequencies.
With 100Hz and 120Hz it mesures ~7.8nF.
With 1kHz ~5.9nF. (Both caps showing same result)

@mlurye
Interesting. What do you think is going on?
I would guess that perhaps at higher frequencies, the plates
push apart more ... creating a larger gap between plates ..
resulting in smaller capacitance.
The ionic pressure may fill it up sort of like a balloon filled
with gas, moving the plates away from each other.

[mlurye]

From the Archives of Lester J Hendershot by Mark Hendershot In this book on page 28 Hendershot in Schematic Drawing mentioning "Resonance Tuner", I wonder what it is and how does it work? (Also you can see this tuner on a picture above)

[morpher44]

caps with c-clamps

In this book on page 28 Hendershot in Schematic Drawing mentioning "Resonance Tuner", I wonder what it is and how does it work? (Also you can see this tuner on a picture above)

I believe that is simply the hand-made capacitors with an ability
to compress the cylinder using a c-clamp.
You can see in another photo, the one with the bulb lit,
him adjusting the c-clamp.

This amounts of a variable capacitor in the nano-farad range.

[mlurye]

I believe that is simply the hand-made capacitors with an ability
to compress the cylinder using a c-clamp.
You can see in another photo, the one with the bulb lit,
him adjusting the c-clamp.

This amounts of a variable capacitor in the nano-farad range.

morpher Good point. That's how I was adjusting my caps, but I was compressing it all around not in one spot.

[NOMDI]

morpher Good point. That's how I was adjusting my caps, but I was compressing it all around not in one spot.

@mlurye
Hi, i've just ordered microwave capacitors for tests...Thanks for the idea

@all
Don't you think that instead of clamping the handmade capacitors it could be better to add a 500 pF variable air capacitor in parallel, like vintage big and ceramic capacitors used in radio ? Just to avoid unwanted variations and to get a precision adjustment ?

[mlurye]

NOMDI did you build your coils or just collecting parts for now?

[NOMDI]

NOMDI did you build your coils or just collecting parts for now?

I'm building my coils but they are not ready, not yet... I also collect the other parts for the device. Unfortunately I don't have a lot of time to build faster...

I've made an experiment with a buzzer (the model used by morper44) : by bending the electrodes and the clapper holder, It works with a very low voltage 0f 0.2V DC. Don't start by itself but need a very small impulsion with finger... then runs with a very very small, mosquito-like, sound. I'm surprised it can run with a so low voltage...

[mlurye]

What transformers are you using? Make sure they are identical, I've got 2 transformers from the same maker but they are not identical

[NOMDI]

@mlurye

I forgot to tell you that this result has been achieved with a horseshoe magnet placed over the coils which, i noticed, helps to decrease the voltage running threshold...