Cecil Moore wrote:
Exactly. Plot -j567/100 and -j567/600 on a Smith Chart and
read the phase shift directly from the wavelength scale
around the outside of the chart.

Well, not exactly directly. One must multiply the
delta-wavelength by 360 degrees to get the phase
shift. If the angle of reflection coefficient
degree scale is used, it must be divided by two
to get the actual phase shift.
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73, Cecil http://www.w5dxp.com