Point 1) is wrong (if resistance is greater than 50 ohms),
Point 2) is correct.
Use your nanovna to measure the phase of S11 for a resistor
that has a value between perhaps 60 and 100 ohms.
Keep the frequency to something reasonable, say below 100 mhz,
so you don't have to worry about resistor lead length.
Phase is zero.
To do this, select a trace, select channel 0, then select a format of "phase".
Only if the resistor is below 50 ohms does the phase flip to 180 degrees.
In both cases, the complex portion is zero, and we are measuring a pure resistance.
Jerry, KE7ER
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On Mon, Aug 24, 2020 at 11:02 AM, David Eckhardt wrote:
1) Yes, measure the frequency where the phase shifts from +180 to -180
degrees.
2) Using the definition of resonance: Measure the frequency where the
complex portion of the impedance goes to zero.
In reality, both methods are measuring the same parameter, just presented
in different formats.
