DIY nanoVNA graphs

Programs' communications with nanoVNA is simple and documented

nanoVNA command behaviors and interactions can be unobvious..

nanoVNA is conceptually simple

It measures for some devices changes in RF signals phase and amplitude, for ranges of frequency samples.
It returns those in S11 (input impedance mismatch from 50 Ohms resistive) and S21 (gain and phase shift) format.

Software to communicate with nanoVNA need not be complicated

Pass commands to nanoVNA from cmd.exe or other terminal or shell scripts and capture results.

Combine captured nanoVANA data into gnuplot (almost Touchstone) file format using e.g. cat and paste

Render Touchstone format to Smith and rectangular plots by gnuplot
Calculate and plot e.g. resistance and reactance values from S11 data using gnuplot scripts

Batch processing advantages:

task-oriented, easily duplicated, "self-documenting"

let the OS handle multi-threading and process scheduling

powerful and fairly easy using bash and not necessarily horrible by Windows .bat scripts

No commercial softwares (other than Window$) are injured during this production.

Relatively simple scripts flexibly combine data for plots of interest.

Batch and gnuplot scripting requires use of some text editor.

Python edits only for changing USB port from 'COM3' in nVargs.py

nanoVNA shell command scripting constraints:

reset interrupts communications and should be avoided

clearconfig wipes out calibrations and should be avoided

nVargs.py will eventually prefix pause and append resume to nanoVNA commands passed to it.
Otherwise, nVargs.py is intended to be so 'dumb' that any new nanoVNA shell commands should already work.