All,

The setup is an 8407a network analyzer with an 8412a display. The
forward and reflection detectors are mini circuits ZFDC 20 - 4's. These
are power detectors.

The question is: With a short stub on the detector will the open or the
short represent zero phase angel?

The setup basically is working. Open and short read 180 degrees apart. A
cap and an inductor are plus and 180 apart and 90 out of phase with the
open and short.

Thanks - Dan