Kapanadze and other FE discussion

[Sergh]

I agree for BNC connector only if it is a sort of compromise between 50 and 75 Ohm for
PSM-32 selective voltmeter  having generator build in
As you see on the picture  for 150 and 600 Ohm there  is separate input for Rx  and output for Tx
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HP3586B is  holding the same rules just a little  differently. - selective voltmeter no generator build in.
Signalcrafters model 110 uses BNC for unbalanced  and Banana plug  for balanced .
selective voltmeter  having generator build in
http://signalcrafters.com/Files/Model%20110.pdf
but :
- impedance of a transmission line and matching load is very important  at any frequency.

These devices you refer to are designed for high-frequency measurements up to several tens of megahertz.
The G3-120 generator is designed for low-frequency measurements up to 0.5 MHz.
Coaxial connector with 50 ohm impedance in a low-frequency device with an output impedance of 600 ohms to infinity. This connector is a inhomogeneities in the line.
For a wave, this inhomogeneity represents a step. But for the formation of a reflected wave, this step must be at least somehow commensurate in size with the length of at least a quarter of the wave. Otherwise, it looks like you threw a match on an ocean wave during a storm and hope that this will stop the storm.

There are special devices for determining line inhomogeneities:
https://en.wikipedia.org/wiki/Time-domain_reflectometer
Pay attention to the risetime of the test pulses and compare them with the duration of a quarter wave at a frequency of 500 kilohertz.
Heterogeneities in the transmission line would be relevant for a long line length. But a meter long cables are included with this generator G3-120, of course, the propagation and significant reflection of the wave in such a short segment is impossible. Imagine an ocean wave. Mentally cut out a 1 mm segment from it to keep the scale. What will you observe in such a short period? Is it possible to understand that this is a piece of a giant wave? How to create a wave of water, for example, 30 meters long, having a pool 1 millimeter long?

[Sergh]

Russian experimenters  didn't obey  impedance match exactly but close enough.

I didn't quite understand who you are writing about, but if about those that I designated as "Avramenko's fork", then the matter is probably different there.
They believed in the high dielectric constant of conductors, then began to draw some conclusions.

But forgetting about them, there is still some opportunity to make it a more realistic method.
You can't put an elephant in a matchbox, but, maybe you can get low frequency waves in your pocket.
How? You will have to reduce the elephant to the size of a matchbox.

https://en.wikipedia.org/wiki/Velocity_factor

a special dielectric is needed, which greatly reduces the propagation speed of electromagnetic waves, i.e. reducing the speed of light.

maybe this:

https://news.harvard.edu/gazette/story/1999/02/physicists-slow-speed-of-light/

[kolbacict]

here I will support Serge. BNC connectors are used in most Soviet devices simply as a shielded connector.  For example, oscilloscopes are all equipped with such connectors, although they usually have an input resistance of 1 MΩ and a capacitance of tens of pF.

[a.king21]

IMPORTANT ANNOUNCEMENT:


I have found out today that KAPANADZE DIED FROM COVID APPROXIMATELY ONE YEAR AGO.
R.I.P.


I am trying to contact his friends to see if anyone knows the secret.

[x_name41]

Here is a schematic diagram "idea" [without claims] that came to me once )
the primary coil is  with a large Q factor, this is a massive coil wound with a thick stranded wire, approximately 30 meters long and 4 mm thick, similar to Tariel coil, due to the high Q factor through its interruption from the switch, this leads to very powerful high-voltage pulses and current from the ground, at very little consumption, she it is one plate of the capacitor, the other plate is connected to the load and one end of the inverter which is an artificial phase because its other end is connected to the ground, the second coil can look like foil.
if you know the capacitance of this kind of capacitor and the inductance of the primary coil, then you can get the required resonant frequency of this circuit. It is possible to switch the transistor with 50 hertz pack of pulses corresponding to the resonant frequency of the loop...