Beware of cheap underperforming clones

As of 2022 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

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capturing real and imaginary values of s11 and s21


jnv jc 2021/08/14 08:44

hi, i have 3.2 inch tft nanovna v2(firmware-20200501) installed in windows
10. is it necessary to do firmware update? i tried to export s2p files, it
shows magnitude and phase. but i want to export admittance or else real and
imaginary of s11 and s12 to deduce Q factor. could u help me in exporting
real and imag of s11 and s21?

DiSlord 2021/08/14 02:22

What software do you use on your computer to take measurements? All soft i know (NanoVNA saver, NanoVNA App) export s11 and s21 as real and imag part.
Latest firmware versions allow displaying Q-factor measurements on the screen

gary miller 2021/08/14 16:52

Given S11 (the voltage reflection coefficient,) one can calculate the load impedance, Zl.
Zl = Z0 * (1 + S11) / (1 - S11)
All quantities are complex (have real and imaginary components). Z0 is (50 +j0).
Excel has the ability to perform complex arithmetic.

On Saturday, August 14, 2021, 02:22:23 AM PDT, DiSlord <dislordlive@gmail.com> wrote:

What software do you use on your computer to take measurements? All soft i know (NanoVNA saver, NanoVNA App) export s11 and s21 as real and imag part.Latest firmware versions allow displaying Q-factor measurements on the screen

Jim Lux 2021/08/14 11:36

On 8/14/21 9:52 AM, gary miller via groups.io wrote:
> Given S11 (the voltage reflection coefficient,) one can calculate the
> load impedance, Zl.
>
> Zl = Z0 * (1 + S11) / (1 - S11)
>
> All quantities are complex (have real and imaginary components). Z0 is
> (50 +j0).
>
> Excel has the ability to perform complex arithmetic.
>

yes, Excel does do complex math, but it's pretty clunky, because it's
passing strings around and formatting the results is a pain.


You're probably better off doing it in Python, Octave, or Matlab, which
also do complex arithmetic.  There's a *little* learning curve for that
but not huge - as in tiny for doing single calculations.  If you want to
read in a file and plot, yeah, if you're facile in Excel, you could
whack it out in quickly.  But learning how to read a file in any of the
others, and generate a plot, is a few hours *the first time*.


David Eckhardt 2021/08/14 18:39

EXCEL is forever "clunky" in my book. I vehemently dislike it for
engineering and scientific applications! It's really an account's
application.

Just my opinion.

Dave - WØLEV

On Sat, Aug 14, 2021 at 6:36 PM Jim Lux <jim@luxfamily.com> wrote:

> On 8/14/21 9:52 AM, gary miller via groups.io wrote:
> > Given S11 (the voltage reflection coefficient,) one can calculate the
> > load impedance, Zl.
> >
> > Zl = Z0 * (1 + S11) / (1 - S11)
> >
> > All quantities are complex (have real and imaginary components). Z0 is
> > (50 +j0).
> >
> > Excel has the ability to perform complex arithmetic.
> >
>
> yes, Excel does do complex math, but it's pretty clunky, because it's
> passing strings around and formatting the results is a pain.
>
>
> You're probably better off doing it in Python, Octave, or Matlab, which
> also do complex arithmetic. There's a *little* learning curve for that
> but not huge - as in tiny for doing single calculations. If you want to
> read in a file and plot, yeah, if you're facile in Excel, you could
> whack it out in quickly. But learning how to read a file in any of the
> others, and generate a plot, is a few hours *the first time*.
>
>
>
> >
> > On Saturday, August 14, 2021, 02:22:23 AM PDT, DiSlord
> > <dislordlive@gmail.com> wrote:
> >
> >
> > What software do you use on your computer to take measurements? All
> > soft i know (NanoVNA saver, NanoVNA App) export s11 and s21 as real
> > and imag part.
> > Latest firmware versions allow displaying Q-factor measurements on the
> > screen
> >
>
>
>
>
>
>
>
>

--
*Dave - WØLEV*
*Just Let Darwin Work*

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