Owen Duffy wrote:
"Walter Maxwell" wrote in
:

"John Smith" wrote in message
...
wrote:
...
deals with a Windom Antenna, his text on the design, construction,
function and implementation of baluns is well worth the read.

Doesn't that article espouse the Guanella 4:1 current balun built on a
single toroid?

The extent to which such a construction works is due to flux leakage,
rather than the principles described by Guanella.

Owen

Owen:

You might have missed this part from the Windom URL:

"As far as the forward power to the antenna is
concerned there is no ferrite core. This is
because we have transmission “through two
transmission lines”. There is no external flux
around transmission lines. However if the
antenna is unbalanced there will be leakage or
common mode current flow through the
balun. These currents are not transmission line
mode currents. These currents will see a
choking reactance presented by the balun and
be stopped or significantly reduced. These
leakage currents if extremely excessive can
cause heating of the balun (but you have
probably got a serious problem that you need
to fix). Very high SWR can cause voltage
dielectric loss and even flashover between the
windings. Again this would indicate a more
serious problem with the antenna."

I should think a single core would be superior in relation to the above
stated phenomenon. Indeed, I suspect it to be preferable to two cores.
However, if such "leakage" is occuring, the author indicates you have
a problem with the antenna proper which needs a fix ...

However, this URL:

http://www.n0ss.net/qrp_4-1_guanella-type_balun.pdf

in the include pick 4-1_schematic.jpg, in the URL, contains a "blurb" on
how to move a single core design on to two cores.

Regards,
JS