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Hi Kurt,
Request to share data to be entered in nano vna saver for n type
calibration kit,
Regards,
Praveena

Thank you.

Hi Starsekr and others
Pay special attention to Part III. Part I and Part II are describing out learning process. The toroide measurements are "handicap'ed" by the wire loop inductance which you only can eliminate by mesurmetn in a closed chamber where the inductance of the wire/rod passing thru the toroide can be subtracted in a spreadsheet calculation.
In Part II the is a reference to a HP document which explain the mathematic on page 21 / 22 but the link I here provide is for the new version which is far poorer writing than the "old one" I used when we wrote the articles and which has some errors as well. I also provide a link to an excellent article far better understandable.

Ling to where a pdf file can be downloaded for the document "Method for measuring complex permeability at radio frequencies"

Link to the document "Measurement of Complex Permeability Using Short Coaxial
Line Reflection Method"

Have fun
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Starsekr via Groups.Io
Sendt: 19. oktober 2019 09:35
Til: [email protected]
Emne: [nanovna-users] Measuring ferrite beads #test-jig

W. Reeve, T. Hagen, K. Poulsen published some data from and described their techniques of measuring ferrite beads in "Radio Astronomy Magazine" in 2013. They did a lot of work developing test fixtures and error analysis. You can find their papers at :

Hi All

Some years ago I bought a N male clone calibration kit which is a HP85032E
clone kit. It is not that bad(pretty good) and data are very close to what
can be found on the Agilent homepage.

To day I bumped into the kit again on Aliexpress at the following link


fe1303fMMImSf
<.
4fe1303fMMImSf&algo_pvid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e&algo_expid=6d6
a9d32-85a8-428f-a09e-b2a6fc1e830e-1&btsid=afe902d6-210b-40cb-9ac8-21edca20b2
40&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_52>
&algo_pvid=6d6a9d32-85a8-428f-a09e-b2a6fc1e830e&algo_expid=6d6a9d32-85a8-428
f-a09e-b2a6fc1e830e-1&btsid=afe902d6-210b-40cb-9ac8-21edca20b240&ws_ab_test=
searchweb0_0,searchweb201602_10,searchweb201603_52

So if you purchase a set I can provided the data to enter in the
NanoVNA-saver and you will be in good shape calibration male N



Kind regards

Kurt

I agree....... my NANOvna and my Antuino sit there unused because my old brain and the fact that my medical education didn’t cover electrical or RF engineering I am hopelessly lost in using these neat and “simple” devices and life doesn’t have enough days left to live in books learning from scratch all the stuff that has been in this group since the vna came out. I should be happy as my YOuKits FG-01 does just what I need to set up an antenna but these new toys piqued my interest. I want to be part of the “in” group but find it is getting more difficult.

Dave K8WPE since 1960

David J. Wilcox K8WPE’s iPad

No
nanoVNA can only work with internal reference, not external

NooElec made a small 1:9 balun attachment for SDR radios,
it might be a good framework for test jigs

Or get $1 4:1 baluns


.. and solder into hacked attenuator 2x4

there is misspelling, you can find it on ebay for 3 USD.

You can use 450 ohm SMD resistor for testing. SMD resistors works good on HF

the link you provided is very expensive. This balun can be found fo 3 USD on aliexpress and for 6 USD of aliexpress. Some time ago their price on aliexpress was about 4 USD.

In order to test it with NanoVNA, you're needs to attach 450 ohm resistor (but don't use inductive resistors). With resistor you can measure balun input VSWR. More close to 1.00 is better.

W. Reeve, T. Hagen, K. Poulsen published some data from and described their techniques of measuring ferrite beads in "Radio Astronomy Magazine" in 2013. They did a lot of work developing test fixtures and error analysis. You can find their papers at :

I guess I'm having too much fun and running out of steam. :-) I didn't miss the X-axis labels after all. They are just positioned where Y=0 and I didn't spot them..

--
73

Gary, N3GO

Good morning GIN & PEZ;

I completed my spreadsheet sufficient to make the data comparisons of the DERDEI calculations versus my NanoVNA (attached), The results overlay precisely; and therefore track too close to illustrate graphically, so I included a second graph which represents the algebraic difference between the two. The NanoVNA was calibrated approximately 12 hours ago, and the NanoVNA measurements were mad approximately 12 hours after that; so although these results are of high quality, they are not based on an optimal data set.

My DUT is configured of a length of RG8/U and not RG-58 as I reported earlier. I also failed to capture the X-axis labels on the attached charts when I clipped them from my spreadsheet. I made a note of the sweep range used on the chart. I now have a test tool to evaluate this going forward.

--
73

Gary, N3GO

Thank you for the link.The NanoVNA-F seems like another great device, but the larger screen is just a small wish, I'll keep the 2.8" for now. I more or less tried to make a point that it is not possible to listen to every user.

/g/nanovna-users/files/NanoVNA%20PC%20Software/TAPR%20VNA/VNAR4.3.zip

Hi Erik
I have latest dotnet and vc++ on W10 32. 2 nano's Huygen 0.2.3 and DMR 2.5.5.
Both same issue;
Start VNAR4.3 - finds correct port - To Calibration - press 'short' - changes frequencies on nano - Then nothing - nano still running at that frequency - IF I PAUSE SWEEP ON NANO, VNAR4.3 CONTINUES! - completes cal. - same in run - if I pause nano sweep, VNAR4.3 completes, but marker data says NaN, as nano is paused....
So, how can I run nano with VNAR4.3 together? - Both nano's fine with nanoVNA Saver etc.
Cheers
Colin

NooElec made a small 1:9 balun attachment for SDR radios, it might be a good framework for test jigs or hacked to change the transformer to 1:4 or even a 50-75 ohms style using a very small binocular core. Spec says this goes to 90 MHZ.

gin&pez@arg

Let me start by first informing you that I have successfully ran your BBC Basic Program, seeded with the raw data from my NanoVNA; and your program yields results that are consistent with the "corrected" results of my NanoVNA. This test was conducted using a 7 foot (2.134 m) length of RG-58 coaxial cable terminated in a 3.3 ohm carbon film resistor as the DUT (g in your program). The test was performed at a frequency range of 1 to 6 MHz in 50 KHz steps to minimize test hardware parasitic influences from contaminating the calculations. I am now satisfied that I am following your work. I must inform you however; that you haven't made this an easy exercise FACUPOV. :-)

The tasks performed today required that I download and install Putty; identify, download, and install an appropriate version of the NanoVNA software for which the Console Command File is valid; perform the 4 required scans; port the results of each scan into a spreadsheet; perform the compact formula () calculations; plot the results; hypothesize the results were incomplete; Install the BBC BASIC Interpreter; load your BASIC source listing; load in sample data from my scan results; verify the results were in agreement with my corrected NanoVNA measurements; load in another sample data set from my scan results to confirm the first results were not a consequence of serendipity; compare your compact formula with the BBC BASIC source listing to ascertain where they failed to be in agreement; and finally discover that the compact formula is only a subset of your overall solution.

FACUPOV, the journey to this point has not been FACUPOV.

The exercises performed today further confirms that your BBC BASIC program could (should) be readily expanded to:
1) read the 4 appropriately named measurement files, or optionally, read a single file of the three SOL measurements, and an independent file of DUT measurements and;
2) output a computed results file of length equal to the number of data points provided at the input.

As an interim personal aid, my spreadsheet version is far enough along to be worth expanding to include the remainder of your equations and this will satisfy my near term need.

I first attempted to perform today's tasks by entering your compact formula () into a spreadsheet in an effort to verify my understanding of your project. This effort was unsuccessful until I compared it to the BBC BASIC source listing. That effort led me to the discovery that the compact formula is in agreement with the BBC BASIC source, but an incomplete solution overall. A closer look at the BBC BASIC source reveals that I have yet to confirm the full set of equations published previously, corrected by the now revised compact formula ().

To verify the BBC BASIC source, required that I painfully entered individual test data points at the frequency endpoints of my NanoVNA measurements, then perform a calibration and sweep of my DUT on my NanoVNA to facilitate comparing the corrected measurements. Of course; I am not about to do this for all 101 data points and plot the results across any significant bandwidth.

With the above effort expended, I believe I am now able to reproduce your work to this point; but I am only beginning to acquire the tools needed to try understanding it. This is forward progress however; and the results look encouraging so far.

--
73

Gary, N3GO

the reversed engineered CSharp project

Thanks, I'd forgotten that.
When I last checked, it did not seem completed.

My Python hack works well enough,
to proceed with experiments now and later circle back to C#.

I mostly use the email feed to keep track of all the posts.

--
Paul Brodie
techo@...

Oristo wrote:

…. was planning to use C# because experience and less baggage on Windows,

__________________________________________

If C# is more up your alley then the reversed engineered CSharp project at would give you a headstart:



- Herb

Why not just piggyback off the existing python script for the NanoVNA
by edy555 @ ?
You can just throwaway what you don't need and keep what is useful.

First, I did not know enough Python to easily sort that,
was planning to use C# because experience and less baggage on Windows,
but Rune provoked me to try Python, and his was easy to hack:


Still needs a graceful exit for nanoVNA not found: