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| Kirkby calibration kit alternatives? |
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| G0HZU:
--- Quote ---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. --- End quote --- Yes, your data looks much better now. That METAS VNA tool used by suj looks to be very powerful. With my simulator I had a go at plotting the fringing capacitance of the Agilent/Keysight 85033 OPEN vs frequency and I think it looks like the plot below. I hope I've got this right. It only changes a small amount and these corrections only really affect the flatness above about 5GHz. With a cheapo SMA cal kit like the Kirkby kit the SMA based standards won't have the same design integrity as a proper 3.5mm kit so the corrections are much more important because they have to correct for the flaws over most of their 7GHz range. The male SHORT in the Kirkby kit does not look good at all with its limited corrections. I couldn't live with it unless it was corrected better in the cal kit file. |
| hendorog:
--- Quote from: Mechatrommer on February 25, 2018, 07:06:16 am --- --- 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. --- End quote --- Yes, I had to do the same for gmail. That is a bit of a pain and is a very basic, manual approach they have taken to registration. No reply yet. Cutting them some slack though because its free after all and it looks really handy. They might have their hands full if all the VNA nuts on here start registering en masse. |
| suj:
--- Quote from: hendorog on February 25, 2018, 04:26:38 pm ---...No reply yet. Cutting them some slack though because its free after all and it looks really handy. They might have their hands full if all the VNA nuts on here start registering en masse. --- End quote --- I think you don't have a reply because today is Sunday and the institute is not working today 8). I didn't wait for the link too long. |
| hendorog:
--- Quote from: G0HZU on February 25, 2018, 02:45:40 pm --- --- Quote ---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. --- End quote --- Yes, your data looks much better now. That METAS VNA tool used by suj looks to be very powerful. With my simulator I had a go at plotting the fringing capacitance of the Agilent/Keysight 85033 OPEN vs frequency and I think it looks like the plot below. I hope I've got this right. It only changes a small amount and these corrections only really affect the flatness above about 5GHz. With a cheapo SMA cal kit like the Kirkby kit the SMA based standards won't have the same design integrity as a proper 3.5mm kit so the corrections are much more important because they have to correct for the flaws over most of their 7GHz range. The male SHORT in the Kirkby kit does not look good at all with its limited corrections. I couldn't live with it unless it was corrected better in the cal kit file. --- End quote --- Interestingly we now have a way of fixing the shortcomings in the correction data. Although it won't help if the VNA doesn't support L corrections of course, which goes back to your point of needing a better constructed kit which doesn't rely on the corrections as much. Although there is always the option of dragging the data out and doing the calibration on the PC with modern software. It would be interesting to compare the Dr Kirkby coefficents with ours on a tighter vertical scale on the same graph to see if there is any significant advantage one way or the other. |
| hendorog:
--- Quote from: suj on February 25, 2018, 04:38:03 pm --- --- Quote from: hendorog on February 25, 2018, 04:26:38 pm ---...No reply yet. Cutting them some slack though because its free after all and it looks really handy. They might have their hands full if all the VNA nuts on here start registering en masse. --- End quote --- I think you don't have a reply because today is Sunday and the institute is not working today 8). I didn't wait for the link too long. --- End quote --- Yes - it is pretty clear based on the email method and the delay over the weekend. The registrations are processed manually. AI hasn't taken over yet :) |
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