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Best VNA for around or under $2000?

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theblinkingman:
I ran a T-check on a LibreVNA and it seems to only make it up to 1.25 GHz under 15%, which doesn't seem that great. 

I used the same T-check on a higher quality VNA and got under +/-4% up to 8 GHz. I used the built in calibration procedure on each, so it's possible something went wrong with that on the LibreVNA. 

Also did a S21 measurement with both ports terminated. 

DiSlord:

--- Quote ---Does LiteVNA64 actually allow you to define cal standards?
--- End quote ---
Yes, LiteVNA allow define calibration standard:
Calibrate->Calibrate->Calibtation standard

Remove Use Ideal flag and define
Open:  Z0, Delay, Offset Loss, C0, C1, C2, C3
Short:  Z0, Delay, Offset Loss, L0, L1, L2, L3
Load: R, Z0, Delay, offset Loss, L, C
Thru: Z0, Delay, Offset Loss

You can change values and in real time see changes

Additional possible save and load standard settings to/from sd card.

PS calibration standard settings equal as on LibreVNA / NanoVNA Saver (NanoVNA saver not use Offset loss settings)
PSS  my tests cheap China calibration kit, define calibration standard settings and improve it
https://groups.io/g/nanovna-beta-test/message/4538

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