1. Voltage, Output vs Input
2. Takes more time than I have to explain.
3. Ditto.
4. S11 and S21 are ratios (dB actually, which is really just a ratio) of
voltages. S11 = 20*log(Vreflected/Vincident). S21 = 20*log(Voutput/Vinput)
On Thu, Sep 9, 2021 at 11:11 AM Andrew Kurtz via groups.io <adkurtz=
[email protected]> wrote:
I have been through the Wiki and got some answers, but here are some
questions about the output options on the nanoVNA-H4:
1. ¡°Phase is the relative phase difference between source and received
signals.¡± What does this really mean? Is it current to voltage phase, or
change in that as influenced by the DUT, or simply phase change of voltage
alone, or¡?
2. ¡°Polar is same as Smith chart but with complex reactance rather than L
or C shown.¡± Yes, the trace is identical to Smith, but why are the real
and imaginary numbers reported nowheres near the R and X reported by
Resistance and Reactance outputs?
3. Likewise, Real and Imaginary have no similarity to Resistance and
Reactance; shouldn¡¯t they be the same?
4. Everyone says that the VNA reports S11 and S21; I get that these are
reflection and transmission, but what are the units (or dimensions)? Is it
voltage, or power, or current¡?
Thanks!
Andy
--
Carey Fisher
careyfisher@...
