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Phase sign in S21 measurement

Question asked by lalalu on Jul 1, 2010
Latest reply on Jul 1, 2010 by daras

Why does the phase measurement is negative?
I mean - I cal the VNA with thru and measure 0 deg. Now I add (lambda/4) length cable and measure -90 deg ?
Why the measured value is negative the logic says the measure should be +90 deg.

I'm sorry if it sound like a silly question but I ask few "experts"  and they said that the way the VNA works.  WHY ???