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Here's a typical example I was attempting to describe:?

Consider that the Z at the input end of a 50 ft section of Zo=600 ohm line is 227+j521.? Assume that's the measured S11 value from a single-port antenna analyzer module.? Transmission line software like TLW can mathematically find precise component values that convert the complex Z into 50+j0.? In this case, I selected a high-pass L network option.? The resulting component values are 43 pF series C and 5.36 uH shunt L at the line side.? No fuzzy logic needed to ignorantly step relays until a VSWR value under 1.5:1 is achieved.? By joining an S11 analyzer with the transmission line software into one unit: (1) the mag + phase is measured; (2) component values are computed; and (3) the analyzer module switches L and C components to those values in one switching event, perhaps through an I2C interface.? ?Images below.

Paul, W9AC