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Hi aa--something
Cables length as such has basicly no influence. Consider the cable as part of the hardware system, they are calibrated away.
The only effect is small potential phase variation if the cable are bended between calibration and connecting to a DUT.
Some cable are more phase stable than others
Kind regards
Kurt

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Sendt: 6. oktober 2019 15:01
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Emne: Re: [nanovna-users] Inductor S21 measurement using nanoVNA

Hi,
I replaced the cables with much shorter ones, and re-calibrated using these 2 new cables (see attached photos), and I am getting the same results. Not sure the cables interfere with the nanoVNA results. As far as I remember, cables longer than wave length/8, I should worry about transmission line effects. However, in this case, the cables are 10 cm long each, and the subject frequency is 60MHz.