Jim Kelley wrote:
I think it might also be interesting to discuss the instance in which
the Bird is interfaced with a real halfwave section.

If the Bird is inserted at a point where the net voltage divided
by the net current is equal to 50, apparently a 50 ohm Z0-match
is achieved at that point and any length of lossless 50 ohm coax
can be inserted without altering the forward/reflected conditions
in the adjacent transmission lines.
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73, Cecil http://www.qsl.net/w5dxp