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Can someone point me to some reading material to help me understand how to measure phase on my ENA?

I have the operators manual but it is not at all helpful. In short I chose a simple ~19" length RG-223 coaxial jumper as a starting point to help me better understand my instrument. I am having difficulty in getting the display to show phase shifts great then 180 degrees even though the Y-axis is indicating I have plenty of latitude, i.e., +/- 450 degrees etc.

I.e., below is a screen capture where I am showing the phase shift thru that jumper at 104MHz.....back of the napkin calculations show that in fact ~19" length of V.F. 0.66 cable should provide -90 degrees phase shift:

Things even work well when I double the frequency to 208 MHz and obtain a ~180 degree phase shift:

The issue is when I go slightly higher in frequency I would like to display phase shifts great then? -180 degrees. As soon as I go higher in frequency the plot jumps up to a positive 180 degree phase shift.

I would like to know if I can setup my ENA to display say -270 or -400 degree phase shifts. I have been using PHASE under the display options and do see options for POS PHASE, & EXPANDED PHASE. I was hoping expanded phase would do what I wanted but it did not. The manual does not discuss how to use these formats.

Gedas, W8BYA

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