I was referring to the C0 contents when the nanoVNA was shipped. I think the standard SOLT units are about as close to ideal as manufacturing constraints and cost constraints make possible, and that the VNAs have to assume these standards are close to ideal. Otherwise the standards would come with estimates of their deficiencies and that these deficiencies could be corrected for while calibrating. Thus the original C0 contents COULD be better than the cheaper SOLTs can calibrate to -- or perhaps not. Perhaps the supplied SOLTs were used, and perhaps used carelessly at the factory. I have no knowledge of this, and was hoping for some discussion -- and help in determining if the original C0 values should be kept, or if it is best to recalibrate using the supplied SOLT right from the start.
