John Smith wrote:

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.

Did you mean a two core design onto one core?

Here is an analysis of the single core version:
http://www.vk1od.net/balun/gsc/index.htm .

Guanella did not show the 4:1 balun on a shared magnetic circuit, and it
is an error on the part of those who think that the two independent TLTs
in Guanella's circuit can be coupled without changing the behaviour
significantly (basically, ruining it).

Owen