It may have been intentional, Roger, or at least fortuitous.
See the second article down here:
Mike - M0MLM
------------------------------------------------------------------------
*From:* Roger Need via groups.io [mailto:sailtamarack@...]
*Sent:* Sunday, 13 December 2020, 2:19 am
*Subject:* [nanovna-users] NanoVNA-H4 Calibration Loads
toggle quoted message
Show quoted text
Today I unboxed and tested a new NanoVNA-H4. The first thing I did was to measure the calibration loads supplied in the box. I tested them with a DE-5000 LCR meter at DC and 100 kHz. The short was .01 ohm but the "50 ohm" cal load was 50.78 ohms. This is not nearly as close as the "50 ohm" cal load in my NanoVNA-H which read 49.79 ohms. Both NanoVNAs are genuine Hugen products. I also noticed that there are physical differences and finish between the -H and H4 loads. Even the through connector is a different size.
Kurt Poulsen did a nice job characterizing the 2.8" -H loads and it would have been nice if the H4 had continued to use the same devices. I guess I will continue to use the old set which is closer to 50 ohms.
I though I would post this so others know that not all the cal loads are the same in Hugen's products. A photo of both is attached.
Roger
