Products > Test Equipment
Kirkby calibration kit alternatives?
Noy:
Thx for all the clarification.
I think i will go with the Mouser Parts and will not get Male-Male thiny + box.
I don't know for what i need this Male-Male Adaptor. Everything i use (cables are Male - Male, PCB connectors everytime female..) so i don't know for what i can use it.. So i will go for single buy (especially i have to order some parts from mouser already..).
And if i need such a adapter (maybe i will calibrate without a cable at the VNA Port with the N->SMA Female Adapters (https://www.delock.de/produkt/89983/merkmale.html)) i can use a "cheap" chinese and calibrate them out or? Its the same like using a very short cable?
Mechatrommer:
--- Quote from: Noy on November 19, 2020, 01:24:46 pm ---with a "pogo plug SMA"...
--- End quote ---
oh no, dont! :palm:..
1) slight wiggling will change characteristic, and where the measurement plane will be? thats why they will ask you to buy another expensive torque wrench. if its thats easy everybody is already doing that and skip the torque wrench.
2) what do you want to mass produce cal kit for? not everybody buying it. you will compete with $4 kit anyway that people buy because they think its good enough.
your provided SDR links are not deep enough... i remember i saw a website at characterizing few SDR-kit, i cant find it right now... the closest thing you should read is something like this..
http://hamcom.dk/VNWA/
https://www.sdr-kits.net/downloads/2014-Rosenberger-Fairview-male-female-Cal-standards.zip
from https://www.sdr-kits.net/Female-12%20GHz-Kit
some sort of hand tuning cal kit, or to see how much batch to batch differ in characteristics. i dont read because i dont own one and afaik they dont include Ln and Cn effect into consideration. you may read yourself and decide if its good enough or what and then tell us something about it. cheers.
switchabl:
--- Quote from: Mechatrommer on November 19, 2020, 01:35:23 pm ---imho no, except with extra effort to screw unscrew for connection and reduce usable life of the connectors. with good continuity/connectivity and good quality 50 ohm Zo thru, connecting to Open and Short will only increase its offset length, the rest of parameters are still the same. connecting to a good Load will still appear 50 ohm to the VNA. but well, this is true given the CAL set is of descent quality, if not, even a SMA cable or the sacrificial adapter connected to your VNA can look funny. this can quite visible beyond 3GHz and much lower with nonsense hunglow grade. ymmv.
--- End quote ---
Yes, in theory, an ideal adapter will add only delay. And to be fair a good 3.5mm air-line f-f will get reasonably close to that. Your average SMA adapter may not be that ideal. Minicircuits specifies a return loss of only >23dB @<8GHz for theirs. Now imagine connecting your nice 40-45dB calibration load on the other side and calibrating with that. Yes, that is a bit extreme, the adapter will usually be much better then the spec (especially at low frequencies), but you get the point. In particular, unless you have a cal-kit for the other side, you will not be able to check how good it actually is. Sadly so, because it would be much simpler and more economical if we could just have one cal-kit with a bunch of adapters.
Now to be clear, for none-critical measurements you can get away with a lot. On a good lab-grade VNA, you can skip the cal-kit entirely, attach your cables and adapters and run the automatic port extension if you don't care about a few dB. But if you are worried about the 35dB residual mismatch you might hope for with the cheap Rosenberger kit, you should probably worry about adapters.
rubidium:
Has anyone tested out the Applied EM Innovations kit?
小太:
radar_macgyver mentioned they bought an Applied EM kit while having access to a professional 3.5mm calibration kit... I wonder how the comparison went given that it's almost 2 years later?
For reference, current prices with conversion rate £1=US$1.263
ItemKirkby
£GBPKirkby
$USDApplied EM
$USD6 GHz5997 GHz4855788 GHz513648649Torque wrench150189(included)
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