You have noted the shortcomings of* ANY* VNA, including those from the "big
boys" at $$$$$. Nothing new, here.
Yes, the VNA deals with impedances. Frequency analysis best be
accomplished using a spectrum analyzer, not a VNA. Time analysis best be
accomplished using an o'scope.
Impedance domain......frequency domain......time domain......
Dave - W?LEV
On Sat, Feb 22, 2025 at 2:47?PM Team-SIM SIM-Mode via groups.io <sim31_team=
[email protected]> wrote:
Hi
We have the impression that the NanoVNA is as an impedance meter, a
Q-meter or a frequency analyzer, while it is only a transmission line
network analyzer, that is to say we have to do with impedances that turn
around 50 Ohm with a SWR that can go to 10:1 max beyond which the
precision loses much of its meaning,
in fact the S11 measurements are made at the base of a physical 50 Ohm
resistive divider bridge, it is sufficiently precise around 50 Ohm but it
loses its precision as we move away from this value, saying very correct
measurements is between 5 and 500 Ohm otherwise the interpretation of the
measurements becomes very compromised,
thus the Z-renormalization should not used to the extrem much from 50 Ohm
and it will be tedious as we are moving away from 50 Ohm, so renormalizing
the Z to 440 Ohm is really at the limit of validity of these ingenious
calculation methods which facilitate the measurements with the greatest
simplicity and least chance of implementation errors.
so with this good results, we are already Happy .
73's Nizar
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*Dave - W?LEV*
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Dave - W?LEV
