Anne,
Actually, I'm more interested in determining the matching range of a tuner with various antennas.
I've used the AI1H method** of testing various tuners but that's a static resistance method. With some of my Z-Match tuners the range would seem to be from about 3 to 3k Ohms. But what would it be with an actual complex impedance (conjugate match). The nanoVNA measurement options could provide that info, I think...?
**Frank Witt, AI1H, Articles in QST Apr/May ¡®95, Antenna Compendium vol 5, QEX (Sep/Oct ¡®03),
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Chuck, W5USJ
Chuck Carpenter