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On Wed, Dec 7, 2022 at 02:03 AM, Luc ON7DQ wrote:

that should of course be "at the Reflection socket" (or CH0)

I fail to understand why the designers of all of these VNAs labeled the ports CH0 and CH1, when every other VNA I have used over the past 45+ years has had Port 1 and Port 2.
This just adds to the confusion, especially when trying to explain S-parameters. S21/S12 makes more sense when the ports are 1 and 2, much less so with 0 and 1.
73, Don N2VGU