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Thanks for that. It does in fact say phase is measured +/- 180 degrees. Earlier I ran a quick test using the expanded phase format and I think it is in fact exactly what I want. Below is the same cable swept from 100 MHz to 300 MHz. The -90 degree and -180 degree points appear to be at the right frequencies. So if it will help others, un-wrapping phase or wrapping phase is very closely related to the expanded phase display format option of this ENA model. Too bad the users manual is useless in discussing these and so many other neat features.

Gedas, W8BYA

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