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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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