Products > Test Equipment
Kirkby calibration kit alternatives?
hendorog:
--- Quote from: in3otd on February 26, 2018, 07:56:30 am ---
--- Quote from: rfspezi on February 18, 2018, 10:25:21 am ---That's why i hope somebody can recommend an alternative.
--- End quote ---
There is a description about using Rosenberger parts, similar to the ones in the SDR-Kits, as calkit, see http://www.hhft.de/index.php?page=competences&subpage=calibration. They just use the offset lengths to describe the standards and leave all the Cx and Lx to zero. It may not be so important to split the femtofarad if you go up to 5 GHz - any excess capacitance or inductance can probably taken into account by adjusting the offset length only.
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Not sure if you have seen this info :- SDR kits actually publish reasonable delay info, and the part numbers of the Rosenberger parts they use. It used to be really difficult to find on their old website but its better now. There is also a document explaining how they got those values. Unfortunately they don't provide the s1p/s2p files or we could use them with your script to get the missing info.
https://www.sdr-kits.net/index.php?route=web/pages&page_id=36_36
https://www.sdr-kits.net/documents/Rosenberger_Fairview_Male_Cal_Standards.pdf
https://www.sdr-kits.net/documents/Rosenberger_Female_Cal_Standards_rev4.pdf
in3otd:
--- Quote from: hendorog on February 26, 2018, 08:18:18 am ---Not sure if you have seen this info :- SDR kits actually publish reasonable delay info, and the part numbers of the Rosenberger parts they use. It used to be really difficult to find on their old website but its better now. There is also a document explaining how they got those values. Unfortunately they don't provide the s1p/s2p files or we could use them with your script to get the missing info.
--- End quote ---
yes, I should have started my message saying "in addition to the well know calkit from SDR-Kits, which comes wit some modeling data" :) .
A few years ago I exchanged a couple of emails with Kurt Poulsen (which prepared the SDR-Kits calkit docs), when I saw a message he posted to the VNWA Users Group on Yahoo saying that had measured the S-parameters of the Amphenol Connex and Rosenberger calibration kits; I don't remember if he also sent me the related .s1p/.s2p files, need to check my old emails.
Anyway, it would make sense to tell the SDR-Kits people that making the measured calkit data available may help in selling more kits :) .
hendorog:
--- Quote from: in3otd on February 26, 2018, 09:04:30 am ---
--- Quote from: hendorog on February 26, 2018, 08:18:18 am ---Not sure if you have seen this info :- SDR kits actually publish reasonable delay info, and the part numbers of the Rosenberger parts they use. It used to be really difficult to find on their old website but its better now. There is also a document explaining how they got those values. Unfortunately they don't provide the s1p/s2p files or we could use them with your script to get the missing info.
--- End quote ---
yes, I should have started my message saying "in addition to the well know calkit from SDR-Kits, which comes wit some modeling data" :) .
A few years ago I exchanged a couple of emails with Kurt Poulsen (which prepared the SDR-Kits calkit docs), when I saw a message he posted to the VNWA Users Group on Yahoo saying that had measured the S-parameters of the Amphenol Connex and Rosenberger calibration kits; I don't remember if he also sent me the related .s1p/.s2p files, need to check my old emails.
Anyway, it would make sense to tell the SDR-Kits people that making the measured calkit data available may help in selling more kits :) .
--- End quote ---
Hehe :)
I was just trawling through his website after reading your post. In one of his older docs he actually points to that same website and shows some of their data :)
It would be great if they did. There are so many 8753's around that the prices have dropped even on eBay - which is the opposite of just about everything else there! There are just no cal kits to go with them (or test sets... sigh...) I'm sure they would sell quite a few of them.
My cal kit box has s/n #28 on it, from about 2015. I wonder what number they are up to now...
suj:
There is one type of calibration kits, that you can easily prepare yourself. Below the X band, waveguides are rarely used, so rather unhelpful for 8753. I have 8510C which supports TRL calibration. I needed to measure the WR90/WR75 adapter. I had the calibration kit WR90 but I missed the WR75. That's what I decided to build. I ordered machining on Wire EDM. I made the finishing of the surface with sandpaper and polishing paste. The determination of coefficients is pure geometry. I measured the length of the 1/4 lambda line with a micrometer. In the most simple case (if we do not measure the insulation), such a kit consists of two elements - short (wall closing the waveguide) and a section of waveguide 1/4 lambda. Inexpensive, quite easy to do and work - I compared the results with Maury X7005E WR90 kit.
And the most important thing :P It must have a wooden box.
Mechatrommer:
--- Quote from: hendorog on February 26, 2018, 06:02:38 am ---If you extract the data then you can still do better using scikit-rf. It supports a calibration type called 'Two Port one Path' or something like that. Basically you can do a full 2 port cal with only one directional coupler. You do need to swap around the DUT to measure both ports.
However to do this, first you need to be able to extract the raw data for the sweeps and transfer it to a PC. Then use software on the PC to do the calibration instead of using the software inside the KC901V.
Without doing a cal of the device, you do a sweep of your cal standards, and export them each into different files - i.e. short.s1p, open.s1p, load.s1p, thru.s1p and the device you want to test dut.s1p. Then you should be able to use those files containing 'raw data' with software like scikit-rf or Metas to do a calibration and measure the device on your PC.
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i think this is the missing piece for me to all of your discussions here, thanks i'll try to catch up. but the downloaded META VNA Tools II only works on Windows later than Vista, so my WinXP cant installed, another |O moment... i'll try install it in another Win10 PC.
--- Quote from: hendorog on February 26, 2018, 06:02:38 am ---Check the 'Data Saving' section of the manual. I found it online, apparently you can export s1p data files to an SD card in the smith chart mode.
--- End quote ---
correct. i'll study this more seriously when i got installed any VNA tools. thanks.
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