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| Kirkby calibration kit alternatives? |
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| suj:
For comparative purposes I've downloaded S1P for female open given by G0HZU in post #55 and checked what definitions will be generated by the tool I use. It's METAS VNA Tools II. https://www.metas.ch/metas/en/home/fabe/hochfrequenz/vna-tools.html This is a powerful metrological tool focused on VNA measurements, and one of its parts is a tool for optimizing the definition of standards. The results are similar to those obtained by hendorog in post #60. |
| hendorog:
Thanks, that is interesting. They have definately found the same point. Maybe try the next one too if you have time: I did another run after removing the data > 7GHz from the S1P file. This fits much better and I think it makes more sense to use a < 7GHz fit for this kit on an 8753 for example which can't go above 6GHz. I've attached the output pdfs for a couple of new graphs I added to the script. These show the difference between the model and the s1p file and I think these are comparable to what G0HZU shows in post #47. The scale on the phase graph is +/- 1 degree though instead of +/- 5 degrees I get something similar to one or the other of the following results :- --- Code: ---Optimization results: offs_delay = 52.360635 ps offs_loss = 5.470724 Gohm/s offs_Z0 = 49.000012 ohm C0 = -226.929303 * 1e-15 F C1 = -1964.414279 * 1e-27 F/Hz C2 = 2232.392337 * 1e-36 F/Hz^2 C3 = -236.119457 * 1e-45 F/Hz^3 Residual RMS error : -67.897497 dB --- End code --- --- Code: ---Optimization results: offs_delay = 34.432636 ps offs_loss = 5.643170 Gohm/s offs_Z0 = 49.000000 ohm C0 = 138.424072 * 1e-15 F C1 = -1291.076067 * 1e-27 F/Hz C2 = 2442.710614 * 1e-36 F/Hz^2 C3 = -217.883669 * 1e-45 F/Hz^3 Residual RMS error : -67.731741 dB [code] --- End code --- |
| suj:
After removing the data f>7 GHz from S1P: Here, I normalized the graph to the data from S1P: |
| hendorog:
Very nice, quite similar to the first result. Also, I just realised that METAS VNA Tools II tool you are using is free. :-+ |
| Mechatrommer:
--- Quote from: hendorog on February 25, 2018, 03:03:19 am ---Also, I just realised that METAS VNA Tools II tool you are using is free. :-+ --- End quote --- but i need to email someone to get the download link. if click the download link, setupping outlook will popup |O i just tried copy paste the email address into yahoo mail. |
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