Some readers may be interested in measurements made on a "real world"
antenna - a 100ft doublet centre-fed with window-line.
At the shack end of the window-line, the equivalent star-network
impedances measured at 3.5MHz were:
Z1 - Window-line Leg 1 to Star Common: 15.1 - j79
Z2 - Window-line Leg 2 to Star Common: 1.6 - j109
Z3 - Star Common to Ground: 30.7 + j110
A perfectly balanced system would show Z1 = Z2
Z3 is related to the common-mode impedance of the system to ground.
Steve G3TXQ
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