Kapanadze and other FE discussion

[stivep]

https://youtu.be/yNs2wc8nRJw?t=352
https://youtu.be/_YPVwfnvqw0?t=326

вот почему ваш CE не работает
Ранняя стадия искровых передатчиков 1901-1927 года
работала с довольно хорошим шумом
из-за ширины полосы искрового промежутка от низкой до 1 ГГц и максимальной на 20 кГц. Вам нужен генератор шума, а не наносекундный генератор.
Вот почему импульсный генератор создания искры ( train impulse generator)
от газового котла является лучшим для его и он был использован в презентации Тариэл Капанадзе мне в 2011 году.
Посмотрите на видео здесь

Wesley

[kolbacict]

1000pf green capacitor.
10pf blue capacitor.
diodes D901a
330Ω resistor.
Thank you . did not expect such interest. 

p.s. D 901 is a varicap.
But why is it a varicap and not a diode?
Generally atypical circuitry.
We could not understand what it was.

[stivep]

https://en.wikipedia.org/wiki/Varicap
https://youtu.be/ngvJ0Wv8cFo?t=449
The Lx coils disappear in resonance increasing the voltage of positive half of an sinusoidal signal
As we decrease the voltage the capacitance is increased.
As we increase  the voltage  the capacitance will decrease. 
      But because we have capacitor C1 at the beginning of the filter than we do not have DC Bios Voltage .
     And because we have capacitor C1 at the rear of the filter  we have it insulated from DC Bios  if there is any.
     If there is no voltage at Varicap than its capacitance will be at fixed value.

So since sinusoidal signal is now changed to  only positive halves  that acts as DC  bios in the time intervals between the halves .( if there  is any voltage >0 )
So to understand it please think of it as system working at Lx coil resonance frequency where capacitive reactance of D901 is compensated to steady fixed and quickly adjusted value .
So think of it as not "important change"  because at output the Voltage will be always the same  and will be compensated  to keep frequency of output signal at fixed value.

However before I will be sure what I'm talking about I need to have original specification of original D901.


here I found:
https://eandc.ru/catalog/detail.php?ID=5793
https://eandc.ru/pdf/diod/d901.pdf
https://www.youtube.com/watch?v=icw8terKP-M

Note: I  said the system work at frequency  200MHz  +
The specification  takes as an example 50MHz  but it is not the highest frequency of Varicap.
Honestly I don't know what is the top limit.
I only look at   coils to determine Frequency of the system resonat stage

Wesley

[stivep]

Advice:
- Connect generator with sinusoidal signal to input
- connect oscilloscope or spectrum analyzer) to output
- gradually increase frequency

Note:
diode  works with  Voltage  from 0 to 50V but.
typical generator gives  around 1V max 10V. so that may be not enough.
For these who don't know  what is varicap /varactor
https://www.electronics-notes.com/articles/electronic_components/diode/varactor-varicap-diode.php
Do not confuse it with  Varistor!!!
https://en.wikipedia.org/wiki/Varistor


Wesley

[AlienGrey]

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