On 9/12/2010 8:59 PM, John Smith wrote:
On 9/12/2010 7:50 PM, Owen Duffy wrote:
... Yet I have seen commercial sites
selling a Guanella 4:1 current balun on a single core, arguing that
Sevick said it was ok in a certain context... a context that is unlikely
to ever exist in an antenna system. But hey, Sevick is Mr Baluns, so they
sell. That context relates to another dimension of the balanced /
symmetric issue.
...
Owen

The first part, above, implies that no one has ever constructed such a
balun(s), one on a single core, one on a dual core, used "balanced"
resistances, to serve as loads, then unbalance the loads, and observe
results. I have, when constructed properly, one can be constructed on a
single core. Is the dual core better? Yes ... is it possible to run the
single core balun in conditions where it will fail miserably?; Yes. Is
it possible to run the dual core balun in conditions where it will fail
miserably?; Yes.

As to the second part, I have found a properly constructed balun to be
both, a choke and "impedance-transformer." Indeed, an excellent balun is
optimized to take advantage of both phenomenon.
...

Regards,
JS

This:
http://www.pdftop.com/view/aHR0cDovL...8xQmFsdW4ucGRm

is actually a pretty fair appraisal of it all ... beware line wrapping.

Regards,
JS