Hello Ed,
To measure the differential mode performance, the windings must be wired
in series and provide an anti-phase arrangement - that is winding 1 end is
joined to winding 2 end and nano VNA connections are channel 0 & channel 1
to winding 1 start and winding 2 start.
I have not seen this configuration before (I use the configuration
mentioned here: ).
Any link to an article about this way of measuring DM?
All the best,
Victor