On Fri, 10 Dec 2010 05:55:15 -0800 (PST), K1TTT
wrote:

it is actually more
correct to call them chokes than baluns since they really just try to
choke off the current on the shield of the coax at the feed point.

Some balance needs to be returned to this (pun intended). The
expression BalUn is first and foremost found in what this word means
in full: Balance/Unbalanced and THAT is the principle transformation.
Turns ratio may come, but that is variable (2:1, 4:1, 6:1...) to a
design that must first meet the requirement of isolating one side that
is balanced from the other side that is unbalanced.

This is achieved in choking common mode currents - hence the BalUn
must effectively present choking action to meet this principle
transformation.

73's
Richard Clark, KB7QHC