Roger Leone wrote:
My math says that 2 sections of 50 ohm coax in parallel makes a 25 ohm
feeder, not a 100 ohm feeder.

The two sections are not electrically paralleled but instead
are used as balanced feeders. They are physically parallel
but electrically in series, thus Z0 = 100 ohms.
--
73, Cecil http://www.qsl.net/w5dxp

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