On Sun, May 18, 2025 at 02:29 PM, Team-SIM SIM-Mode wrote:
Here my plots of S11 and S21 measurement of the 4.63Kohm leaded resistor at
same time , same graphe , same scale
they are dramatically differents , and I prefer the S21 obviosly . May be i am
missing some thing.
Something wrong with your S11 plot. It should be much better than that. Here is a re-post of my previous plot. S11 is flat but is off by 3 to 4%. Note that S21 is much better estimate at low frequencies but rolls off.
Questions
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1. Do you have a photo you can post of your test jig(s) for S11 and S21 measurements?
2. Are you using the enhanced response option in the menu?
3. What version of firmware are you using?
4. Try a 10K and see what you get.
Roger Need
