Hello the cables connected to the vna could be making this causality issue.
I am using n2814a cable.
How can I test test them to see that they are properly functioning?
Thanks.
https://www.mouser.com/ProductDetai...wL09DEmHZq-VAJGHVgD7x8ZPrOI9cR2NK9ZIiOffq6QV3

 

Why do you think they are bad? I test mine with my NanoVNA H4 which I use outside when not using my HP ESA-L1500A bench Spectrum Analyzer. Although my work is 1.2GHz to lower RF so I usually use RG316 or RG400. Which fittings are you using? Do you torque your SMA fittings?

 

I am talking about 70GHZ, i am looking for testing the cable method because I have causality issues.
maybe directivity