Re: Using VNA to test NFC tags
Can you give a sample part #, and I'll go look at the data sheet.
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Jim Lux
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#28872
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Re: checking inductance
An ideal inductor, perhaps, but any sort of practical real inductor with parasitic C between turns and the surroundings varies with frequency. The loss also changes with frequency due to skin depth
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Jim Lux
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#28871
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Re: Common ground and 2-port measuring
E.g. a "back to back" test of a pair of coax to banana jack adapter (which is not a balun) would show good S11 and S21.
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Jim Lux
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#28870
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Re: LogMag and SWR
For reference a LogMag reading of -14dB is the same as a VSWR of 1.5:1. Any logmag reading less than -14dB is better and better. If you get a logmag reading of -20dB then you are in very good shape.
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Clyde Spencer
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#28869
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Re: checking inductance
Inductance is independent of frequency. Inductance only depends on the materials used (this also means that the environment of the element is important). If you vary the frequency, the inductance
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Marc et Nicole Feuggelen-Verbeck
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#28868
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Re: checking inductance
Inductance may vary with frequency, e.g. when there is a ferrite core. The core material's properties are frequency dependent. Also, the effect of the interwinding capacitance increases with frequency
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Reinier Gerritsen
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#28867
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Re: Using VNA to test NFC tags
Jim Lux wrote: Hi Jim, thanks for a thoughtful response.? But I'm not sure transmission line effects play into this test at 13.56 MHz, where wavelength/10 is around 10 feet.? They could explain some
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Larry Martin <larry@...>
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#28866
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Re: checking inductance
The term "inductance" has two meanings. It may mean the inductance exhibited by a coil or circuit at a frequency of interest. It also may mean the inductance at a low frequency where variation with
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Brian Beezley
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#28865
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Re: checking inductance
The NanoVNA will measure inductance over a frequency range, which you configure in the sweep settings, just like with other measurements. In theory, the inductance does not depend on the frequency,
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Andreja YU1NKA/DM1NKA
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#28864
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Re: checking inductance
The value of an inductor is a given and depends on several factors, but CERTAINLY NOT on the frequency F8VOA , Marco Op 18/07/2022 om 09:27 schreef Observer: --
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Marc et Nicole Feuggelen-Verbeck
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#28863
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Re: Correction of error introduce by a transmission line connect to the VNA port 1
Hello Roger, I have two coaxial cables that came with the NanoVNA. I cut one of them to make the solder. I use the cable I didn't cut to do the calibration and after connecting the one I cut, I
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Diane BONKOUNGOU <dianebonk2@...>
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#28862
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checking inductance
Its a fact, that inductance value, vary according to frequency. How does the nanovna measure ? Does it use the saved selected frequency range inside the nano ?
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Observer
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#28861
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Re: missing sma
#adapters
yes, I do have the female to female . I was to quick to assume I had something missing. And, yes, I am following that Absolute Beginners manual . Some slight insignificant differences in software.
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Observer
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#28860
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Re: Common ground and 2-port measuring
Hi Victor, Interesting reading about cmc models and ways of establishing by measurements and maths of obtaining values for the various elements of the models form the links you provided, thanks.
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Ed G8FAX
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#28859
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Re: LogMag and SWR
My quick notes about used foumulas in NanoVNA
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DiSlord
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#28858
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Re: LogMag and SWR
Hello I saw and verified that we can recalculate all the parameters from S11. Can you explain to me : - What is the native measurement performed at the bridge level - What is the first parameter
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F1AMM <18471@...>
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#28857
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Re: #calibration Calibrating tools for UFL or SWF?
#calibration
Greetings, You may need a few adapters.MURATA MM126056 SWD / SWF TEST PROBE TO SMA FEMALE RF ADAPTOR fd5g59 | eBay | | | | ?50.00 | | | | | | | MURATA MM126056 SWD / SWF TEST PROBE TO SMA FEMALE RF
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Chris Gardner
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#28856
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Re: #calibration Calibrating tools for UFL or SWF?
#calibration
Very unlikely.? ? If you mate and remove a UFL about a dozen times, it no longer makes a good repeatable connection.? ?Really a connector designed to be used once during the assembly of a
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KENT BRITAIN
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#28855
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#calibration Calibrating tools for UFL or SWF?
#calibration
Hello. I bought NanoVNA V2 Plus 4 Pro from tindle webpage. In the package, I got cables and SMA calibration kit (4pcs). But this calibration kit is for SMA cables;
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Josele
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#28854
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Re: missing sma
#adapters
You should also have a barrel connector (threaded on both ends) to connect the cables together for the calibration through test. As a new user you should read the Absolute Beginners Guide to the
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Roger Need
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#28853
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