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Author Topic: Wesley's Kapanadze and other FE discussion forum  (Read 733581 times)

Offline magnetstoo

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3840 on: November 06, 2022, 06:13:50 PM »
  Here's the video if interested   https://www.youtube.com/watch?v=lyrFFk7P0v4  some cussing at the end,,sorry for that..

Offline magnetstoo

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3841 on: November 14, 2022, 09:11:12 PM »
EIO.com now informs me they do not have any PCSU1000 but are contacting the manufacturer (for a discontinued product? !!)--I ask "why advertise?"
 I  find my ext gnd. is sitting at 330mvDC relative to the electrical ground,the wire measures 3.3M ohms and has at least a 180kHz frequency.
I have not been able to recreate  the surge or whatever you can call it.
I have repaired the 24v 5watt linear amp (scavage-ing parts from a 1watt amp)and running it at or near where it avalanched but the resonant frequency is now only at 41MHz to 42 MHz...not 44MHz or 52MHz? (where the bulb lit).I may have to buy another 5w amp or bigger. Here is another schematic that I made trying to make sense of this.
  I did find,when it is resonating,the transformer core ,the linear amp body (=24v power gnd),and the outside ext. gnd. all rose to .5v to 1v depending on the tuning.So I did have a positive voltage feeding back into the ground of the scope at some unknown freq.

Offline magnetstoo

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3842 on: November 17, 2022, 06:34:39 AM »
 -This system had 60v-90v out of it to the bulb, though at a low current, I seen this when the  o-scope was working...  Well, my present idea on what happened was an oscillation got set up in the 10:1 transformer ,perhaps the VARIAC too,and then resonated into the 120v coil --this caused the 12v side to go to possibly 900v.Best  guess it is.I have had that OSC take high voltage surges and the most it would do was hang and tell me the USB could not be found...always a USB issue.That O-scope did not like static electricity.Ive had static settle on my table and it then took over the keyboard..opening windows,menus,programs,occasionally shutting down.... But I do not remember,a flat, shut OFF.I could not get that system to do it again.So Im now shoving--at 50MHz-70MHz-12v into a micro-wave trfmr using a different Linear amp and a bi-fi 38g antennae coil as pickup..,because my 30v amp got shorted out again and I do not have anymore spare parts.Brightness looks about the same as with  the disaster bulb but Its costing 11v @ 1.6a input to get it.....No VARIAC here.Variac was used to try and add a 60Hz to the 50MHz.

Online stivep

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3843 on: November 22, 2022, 03:21:54 PM »
Quote
I saw you mentioned :
The cost of VNA can be $90 for VNA nano. but more sophisticated one is  ~$2000+
I could not agree more
But I also found out that the nano is not as stable as I would have it, especially when measuring inductance and impedance 
low resistance (50 - 1.5 mOhm) csr / shunts in "shunt thru" mode.
So I am looking for a more sophisticated VNA.
I have set my mind on an HP 8753E as I understand that still is a very sophisticated and stable piece of equipment.
I saw you have such an HP 8753, so I wonder what you think of it and if you can recommend that type.

I have many vector network analyzers, and someone would be very surprised
that I prefer 40 years old HP 4194A that is just Impedance/Gain-Phase Analyzer,
https://www.testequipmentdepot.com/usedequipment/hewlettpackard/impedanceanalyzers/4194a.htm

In the world of science, it doesn't matter how old is the instrument, the most important is how it functions and what it does.
I have in my lab few over 100 years old devices that would never sell.
_________________________________________________________

From a practical standpoint:
R3754B Advantest  https://testequipment.center/Products/Advantest-R3754B

]application is important:[/b]
Specifications:
Frequency Accuracy: 0.0005%
Frequency Range: 10 kHz - 150 MHz
Output Impedance: 50 ohms
Output Power Range: 0.0005 mW - 125.89 mW
Sweep Range: 0.1dB

it is extremely fast and it starts from 10 kHz , - that is your statue of limitation for the lower range.
And in my application Zenneck Wave,  the frequency of interest is 18 kHz and lower.
-the upper range is 150 MHz which is for me plenty too much.
and yes it has a Smith Chart
-------------------------------------
in comparison:
HP 4194A is very slow but has High accuracy and wide range-
 Impedance measurement:
 100 Hz to 40 MHz,
0.1 mΩ  to 1.6 MΩ, 0.17% - 10 kHz to 100 MHz, 0.1Ω  to 1 MΩ, 1.5% when used with the HP 41941A/B
 Gain-phase measurement:
 10 Hz to 100 MHz,
-107 dBm to +15 dBm, 0.1 dB resolution color graphic display
\
we are looking at starting range 100 Hz for gain and phase ,
 -and yes, it doesn't have Smith Chart ...so what,  this is  a tool the very precise tool!!!!
so if you're interested with having RLC impedance meter then you know that it will do so perfectly well but only starting from
100 kHz and up.
However in my application the most important is gain and phase - and that starts from 100 Hz for HP 4194A.

Despite of how modern or how old is the device is likely better than any nano VNA made in China.
however everything depends from the application.
For those who deal with frequencies over 1 MHz and mostly antennas they need something small and portable and that's what nano VNA is for.
---------------------------------------------------------------
 HP 8753 has few different versions and for VNA
for a hunter, it is the most confusing what to choose from that particle model.
The name seems to be always the same but there is a huge difference in configuration
for example the lower range may start from 300 kHz or from 30 kHz
and the model that I have starts from 30 kHz
so that VNA is mostly unused by me for Zenneck wave application
however it has very high upper range for those who deals with gigahertz
https://www.kirkbymicrowave.co.uk/Everything-you-wanted-to-know-about-the-HP-8753-VNA/


Wesley
« Last Edit: November 24, 2022, 01:48:03 PM by stivep »

Online stivep

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3844 on: November 23, 2022, 01:39:54 AM »
https://youtu.be/yMz_rtiM7FU?t=121
electrostatic lifting  now applied differently

 Those of you dreaming about floating objects in the air, might be interested.

https://youtu.be/2If9ZJQCyLA?t=307


Wesley

Online stivep

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3845 on: November 23, 2022, 02:08:35 AM »
 more  entertainment:
https://www.youtube.com/watch?v=R9-HWyYdB1g
Perendev Magnet Motor - Does IT WORK?!

you can buy it to check it out.
Wesley

Online stivep

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3846 on: November 25, 2022, 01:22:20 AM »
5 Motors You Have To SEE To BELIEVE
https://www.youtube.com/watch?v=Jlo-sDrq24w
Wesley

Online stivep

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Re: Wesley's Kapanadze and other FE discussion forum
« Reply #3847 on: November 25, 2022, 06:16:22 PM »
https://www.youtube.com/watch?v=nrEBoPYS4nsA Next-Gen Ionic Thruster! (For Flight)

https://youtu.be/wci0pJoMOqQ?t=232 7 STRANGEST New Drones

Wesley