Hi John, I use my VNWA every few days. Would miss it if gone for a few weeks :-)
Though some thoughts: VNA's are, if calibrated and temperature stable, inherently accurate. Requirements are: Must have Log sample spacing. 2 port must have 12-term compensation. Required to normalize Port 2 Zin to 50.00 Ohm. For measurements over 100MHz, must have Arbitrary calibration capability. A way to test capability is measuring Ferrite complex permeability. An example is: https://www.kn5l.net/S21adapter/FR43-material/ Web page is in notebook style with several iterations. Final measurement under heading "FT50-43 Panel Jack Fixture." Follow link for "Calibration Process" In the example above, I predict Fair-Rite 43 material measurement, using HP E4991a with 16454A fixture (1MHz-3.0GHz), has a 2.47nH calibration error. A dynamic range test: https://groups.io/g/VNWA/message/20899 John KN5L On 6/25/21 5:53 PM, John Harper wrote: > I'm as interested as anyone else who might have one to know the accuracy > and reliability of these affordable VNA's, whether nano- or the one from > SDR-Kits. > > I have a variety of VNA's available but am lacking the SDR-Kits model. > Wouldn't it be nice if we knew where it stood compared to the newer > nanoVNA's costing a fraction of the price for the same dynamic range and a > higher upper frequency limit? > > Also, how do the hobby VNA's compare to lab-grade VNA's at HF and up to 1.2 > GHz? > > If you own an SDR-Kits VNA, can do without it for 3 weeks and trust me to > return it to you, please see my offer here: > > https://ae5x.blogspot.com/2021/06/vna-shootout.html > > John AE5X ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
