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I've been spending a little time measuring cans with my nanoVNA.  Often times, my VNA is calibrated right at the port, and when I use a small 8" coax jumper to a part soldered to an SMA, I usually just port extend/e-delay to the end of the jumper. 


I always thought something was off because the delay needed to get the marker to the high z point was always way bigger than logically necessary, so I finally did some comparisons and found that I should not be trusting the e-delay feature.  If I calibrate to the end of the coax, I get good results, but if I e-delay, the readings are both high and no amount of delay will make both the R and X match what the coax OSL shows.  I can get both R and X close changing the delay, but one or the other ends up being 1-15 ohms off. The numbers I get with the OSL at the end of the coax match a different VNA I have, so I am confident that much is right.


I did turn the output power down as low as it would go, found that necessary to get good readings on the siglent vna too.  Currently at -13dBm output.


Mine is a nanoVNA-F 4.3" HW2.2 with firmware 0.2.1 by BH5HNU.  I did search around, but there are so many firmwares, I don't know what to try.  I think I have the latest that is specifically for this unit.


Anyone else have this issue with their nano?  Anyone got a fix that might work for mine?