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Dear Vikram

Thank you for your article! Well written and clear!

I have three questions:

1) You talk about calibrating the VNA using a kit.

But doesn't this Kit need periodic calibration? Do its components not degrade over time?

2) In a laboratory that, for example, has a VNA (2 or 4 ports) for checking cables, how do you ensure the claibration of the VNA to comply with the ISO/IEC17025: 2017 accreditation standard that requires measurement traceability?

3) How to calculate measurement uncertainty with the VNA according to the rules of SO/IEC17025: 2017 (EA-4/02 M: 2022: Evaluation of the Uncertainty of Measurement in calibration)? Do you know literature about this?

Greetings and thanks

Luís Bernardo

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