Kapanadze and other FE discussion

[stivep]

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

[stivep]

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

[stivep]

 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

[stivep]

5 Motors You Have To SEE To BELIEVE
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Wesley

[stivep]

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Wesley