NanoVNA V2 / Forum

Note: this page is a mirror of https://groups.io/g/NanoVNAV2.
Click here to join and see most recent posts.

Calibration with VNA-QT and with NanoVNA-saver


Dirk 2021/08/22 03:58

I'm successfully using VNA-QT and NanoVNA--saver with NanoVNA V2.2.
Also calibrating with these programs is no problem. I already have several calibration files.
Seldom I still use my old NanoVNA (1st version) with these PC programs especially for lower frequencies.
My question is:
Are the calibration files specific for each VNA (I suppose)? So do I have to keep different files (e.g. named V1, V2) for the same frequency sweep range?

Dieter Horst 2021/08/22 14:46

Definitely YES! Calibration is there to compensate for the different behaviour
of your devices. Any change in the setup requires new calibration, let alone
the change of the analyzer itself...



Am 22.08.2021 um 12:58 schrieb Dirk:

> I'm successfully using VNA-QT and NanoVNA--saver with NanoVNA V2.2.
> Also calibrating with these programs is no problem. I already have several
calibration files.
> Seldom I still use my old NanoVNA (1st version) with these PC programs
especially for lower frequencies.
> My question is:
> Are the calibration files specific for each VNA (I suppose)? So do I have
to keep different files (e.g. named V1, V2) for the same frequency sweep
range?

_._,_._,_

* * *

Siegfried Jackstien 2021/08/22 17:05

Or different cables used or...



Am 22.08.2021 14:46 schrieb Dieter Horst <dieter.horst@arcormail.de>:

> Definitely YES! Calibration is there to compensate for the different
behaviour of your devices. Any change in the setup requires new calibration,
let alone the change of the analyzer itself...

>

>
>

>

> Am 22.08.2021 um 12:58 schrieb Dirk:
>

>

>> I'm successfully using VNA-QT and NanoVNA--saver with NanoVNA V2.2.
> Also calibrating with these programs is no problem. I already have several
calibration files.
> Seldom I still use my old NanoVNA (1st version) with these PC programs
especially for lower frequencies.
> My question is:
> Are the calibration files specific for each VNA (I suppose)? So do I have
to keep different files (e.g. named V1, V2) for the same frequency sweep
range?



_._,_._,_

* * *

Dirk 2021/08/23 01:36

Yes, understood.

One question to be sure:
If I calibrated the NanoVNA V2 without PC programs and recalled that calibration before connecting e.g. to VNA-QT, do I have to calibrate again in VNA-QT using the exact sweep range for which the V2 was calibrated before?

Or other way round: Does VNA-QT "use" the internal NanoVNA calibration, that is active when VNS-QT is launched?

Dieter Horst 2021/08/23 22:15

I‘m pretty sure you need to do the calibration in the software again. The software does not know about the calibration. And you cannot select which calibration of the VNA you want to use…
You can play with it yourself! Calibrate it and start the software. You will quickly notice, that e. g. your 50 ohm load won‘t come out right in the middle of your Smith chart. A clear indication that calibration is needed…
Regards
Dieter


Von meinem iPhone gesendet

Reinier Gerritsen 2021/08/23 23:32

The NanoVNA V2 transmit raw, uncalibrated data to the PC. Calibration
has to be done in vna_qt. You can save it and restore it later, all in
vna_qt, not on the V2 device itself.


Op 23-8-2021 om 22:15 schreef Dieter Horst:

Dirk 2021/08/24 02:11

Dieter and Reinier, thank you very much!

To reply to this topic, join https://groups.io/g/NanoVNAV2

View this thread on groups.io