Dave wrote:
This means the only route back for the
current to the inside of the coax shield is from the intended side of the
radiator... thus it forces a balance in the currents, but through a slightly
different mechanism than a 'true' balun transformer.

Sevick suggested that the word transformer *NOT* be used
with baluns. He said, in "Building and Using Baluns and
Ununs":

"By far, most misconceptions regarding baluns are due
to the many radio amateurs who perceive these devices
as conventional transformers that transmit the energy
from input to output by flux linkages and not as
transmission line transformers, which transmit energy
by an efficient transmission line mode."

"If the writers had accepted the correct model for
these devices (given to us by Guanella and Ruthroff),
which shows that *THEY ARE REALLY CHOKES* (lumped
elements) and configurations of transmission lines
(distributed elements), ..." emphasis mine.

"In fact, the perception that the transmission line
transformer is actually a conventional transformer
is so prevalent, that a new name for this class of
devices should be considered -
*broad band transmission line matching networks*.
This name (without the word transformer) would help
in dispelling inaccurate perceptions and in
standardizing the schematic diagrams."
--
73, Cecil http://www.w5dxp.com