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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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