Reg Edwards wrote:
What is the transformation ratio of the W2DU "balun" and other devices
which serve a similar purpose? Between which pair of impedances does
it match?

Resorting to passive voice - The W2DU choke is considered to
be a 1:1 balun. Each bead is considered to be one turn. If
one mounts the beads on a piece of 50 ohm coax, it becomes
a 50 ohm balanced to 50 ohm unbalanced balun. With 50 ohms
on both sides of the balun, the Z0 of the transmission line
used should be SQRT(50*50)=50 ohms.
--
73, Cecil, http://www.qsl.net/w5dxp


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