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VNA freespace TRL phases

Question asked by c3110 on Jun 18, 2009
I am doing a free space calibration on an 8510C.  I'm using a metal plate as my reflect standard.  After I run the calibration, if I put the metal plate back in place and look at the phases of the s-parameters, I get 0 degrees for both the S11 and S22 parameters when I think I should get 180 degrees.  Is this where I would need to add in delay coefficients?  How would I do that?