Jim Kelley wrote:
Well, it's certainly true that both circuits are missing the 50 ohm
impedance discontinuity in the middle, which is at least one of the
"present topics" (and my point).

Jim, if the ratio of net voltage to net current is already 50 ohms,
then your Bird "impedance discontinuity" should cause that to change
but there is no evidence whatsoever that it changes anything. Conclusion:
The insertion of the Bird does not appreciably change the V/I ratio.
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73, Cecil http://www.qsl.net/w5dxp