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Hello,
Thanks, everyone for your tips.
Finally, this is what I've done.
Best regards

Le jeu. 21 juil. 2022 à 00:44, Stan Dye <standye@...> a écrit :

Rather than cutting the cable, you should calibrate with the cable attached
to the nanovna, attaching the calibration standards at the other end of the
cable, using connector adapters if necessary. This way ensures that all
aspects of the cable (length, loss, etc.) are compensated for by the
calibration, perfectly removing all those circles from the smith chart.
Stan

On Wed, Jul 20, 2022, 2:18 PM Diane BONKOUNGOU <dianebonk2@...>
wrote:

Hello Siegfried,
Thanks for your response.
So If I cut more of my cable could I reduce the number of circles (the
phase shift)?. I struggle to correct the delay with a lot of circles.
Best regards.

Le ven. 15 juil. 2022 à 15:35, Siegfried Jackstien <
siegfried.jackstien@...> a écrit :

You have to calibrate at the cable end with open short load
And with such big cable soldered to such a tiny pcb your results will

be

at least questionable...
On so high frequencies even an sma to n adaptor will shift your smith

90

degrees around... A long cable if not calibrated out will show a

handfull

of circles (as you can see)..
Dg9bfc sigi

Am 15.07.2022 14:20 schrieb dianebonk2@...:

Hello everyone,
I am a beginner in using the NanoVNA, I have a calibration problem

after

connecting a transmission line into the VNA. You can see some

pictures

of

the result in the attached document after connecting the cable to the

VNA

in the attached file.
Could someone tell me how to correct the impedance shift introduced

by

the

cable? Thanks
I went to the "electrical delay" menu to correct the problem by

adding

a

delay but it got worse. I don't know what to do.

I want to solder the cable afterwards into a PCB where we have

antenna

traces.