The big white coil is covered by isolation. I did this for the high voltage project, to prevent arc. So the wires can not be seen. It's wound by 1mm diameter enamelled wire, around a PVC tube of 160mm diameter, total wire length is a little more than 180m, we can take it as 180m.
This is my setup. The big white coil is my secondary coil, and here is the primary energizing coil. This one here is the pickup coil.
The primary coil is positioned near one end of the secondary, while the pickup coil is placed on the other side, near the opposite end of the secondary.
This secondary coil has two terminals, both connected to ground. There should be two separate ground connections. This is very important, as it creates a large resistance between the two earth connections.
Alright.
Here is my signal generator and the oscilloscope. I’ve set the frequency to 100 kHz, which is 0.1 MHz.
The output of the signal generator is connected to the primary coil. Remember: the signal generator output goes to the primary, and the oscilloscope probe is connected to the pickup coil.
Now, let’s tune this device.
Currently it’s at 100 kHz. I’m going to increase the frequency.
…
Here, I’ve got the first peak. It’s at 1.23 MHz. At this frequency, the pickup coil shows the highest output voltage.
As you can see, if I continue increasing the frequency, the output starts to decrease.
Then, continuing further, I find another peak at 1.82 MHz, but this one is a bit smaller than the first.
Continuing:
- Third peak at 2.36 MHz
- Next at 2.9 MHz
- Then at 3.4 MHz
I’ll explain this later.
Now let’s go back to the first peak frequency, which is 1.23 MHz.
At this point, if I try to touch the coil—specifically the center point—you can see the effect.
Now I’ll put my hand near it.
You can see it goes out of resonance. If I keep my hand near the coil, I have to decrease the frequency to maintain resonance.
When my hand is here, the resonance shifts to about 1.17 MHz.
This center point is very, very sensitive.
It’s very, very sensitive.
But if I keep my hand near the far end of the coil—here, I put my hand here—you can see it only changes a little bit. Not very much. The change is negligible.
Alright, and I will explain why later.
Now let me explain this first.
The center point has the highest voltage. As I said, it is a standing wave along this coil. The highest voltage occurs at the center point.
So if any conductor is near the center turn, it will add capacitance to the coil.
Alright, now I’m going to disconnect the oscilloscope probe.
Now I will use this probe and move it from here to here, and back again. While I do this, you will see the waveform on the oscilloscope screen.
Alright.
At this frequency…
Now the probe is at one end. You can see it here. I will move it along the coil.
Now it’s here—look at the waveform. It becomes chaotic, then moving… moving… oh, it reaches a peak… then it decreases…
At the very end, it’s almost a zero node—but not exactly zero. That’s because I am holding the probe near the coil. My hand and the probe add capacitance to the coil.
So at 1.23 MHz, it is no longer perfectly resonant due to my hand and the probe.
But you can still see that along the coil, at certain points you get a peak, then it decreases, then goes back to zero, then again becomes chaotic.
So along the coil, you see: peak → decrease → zero → repeat.
Because of this behavior, this cannot be a simple LC circuit. It is a typical standing wave.
You see—it cannot be an LC circuit. It is a standing wave along the coil.
Now I’m going to reconnect the probe to the pickup coil.
Okay, now the oscilloscope is connected again.
Let’s find the other peaks.
This is the second peak. I’ll continue increasing…
Here is the third one… and the fourth one at 2.9 MHz.
Alright.
Now I will disconnect the probe again.
And I will repeat the experiment—moving the probe along the secondary coil from one end to the other.
Like this.
Now look at the oscilloscope screen.
At one end, it’s almost nothing—just noise. Now I move…
Peak → zero node → peak → zero node → peak → zero node…
Let me do it again so you can see clearly.
Starting from the end:
Moving…
Peak → zero node
Peak → zero node
Peak → zero node
Peak → zero node
This corresponds to the fourth resonance frequency, which gives a high output at the pickup coil.
Along the secondary coil, this is clearly a standing wave.
If this were an LC circuit, you would not see this phenomenon. You wouldn’t see repeating peaks and zero nodes along the coil.
But since it is a standing wave along the secondary, you can clearly observe:
Peak → zero → peak → zero → peak → zero.
Alright.
Let’s see—I connect the probe back to the pickup coil.
Okay, now let’s go back to the very first peak.
Now I’m going to do as Don Smith suggested. I will slide the primary coil along the secondary, like this—moving it along the length of the secondary.
While I do that, I’ll show you the waveform and the frequency.
Now I start sliding it. You can see it goes out of resonance as I move it toward the center.
Now I place it at this point. You can see the primary is positioned here, and it is currently out of resonance.
Now I will find the resonant frequency for this setup.
If I decrease the frequency, you will find a small peak—let’s see…
And remember, the output scale (amplitude) here is about 860 kHz.
If I increase the frequency…
Oh, here—this is a big peak. You can see it’s much larger. This occurs at about 1.7 MHz, and it’s bigger than the first one.
So, 1.7 MHz is actually the resonant frequency we want.
The earlier one at around 860 kHz is not what we want.
This happens because the signal bouncing inside the secondary creates unpredictable behavior.
That’s why we follow what Tesla did: place the primary near one end of the coil, and the pickup at the other end. Also, both ends of the secondary should be connected to ground. This helps prevent chaotic reflections of the signal.
Don Smith suggested sliding the primary for fine tuning. Yes, it can be used for fine tuning—but it is not the best method.
If we place the primary here, then effectively only part of the coil becomes the actual working secondary. This section acts as a half-wave resonant section, while the remaining part of the coil does nothing useful—it only introduces unwanted effects.
So although we can still find a resonant point this way, it is not optimal.
We should still place the primary near the end of the coil.
Now, let’s look at the calculation.
The total wire length of the secondary is 180 meters.
So the full wavelength of the longitudinal wave is:
180 × 2 = 360 meters
The half-wave resonance frequency is about 1.2 MHz (actually around 1.22–1.23 MHz).
From this, we can calculate the wave velocity.
According to Tesla, the speed of this longitudinal wave should be π/2 times the speed of light.
Now, based on my measurements, the ratio between the measured speed and Tesla’s predicted speed is about 0.92.
So it is very close to Ï€/2 times the speed of light—just slightly slower, but still faster than the speed of light.
Alright, I think this is the end of the video.
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