Sort of about,
"Amidon is Not a manufacturer of ferrite material."
The controlling factor here concerning distortion and harmonics is that
a true transmission line xfmr is Not Flux Coupled like a conventional
xfmr. Because of this, the core plays only the part of a simple RF
choke, increasing the effective inductance of the windings. All xmfr
action is accomplished via transmission line action. The currents in the
bi-filar (transmission line) windings of the un-un are equal and
opposite along the entire winding. Therefore, the core has a very
Un-demanding job; it acts only as a choke, isolating the input end of
the winding from the output end. If the inductive reactance is of the
proper value (easy to accomplish), e.g., at least 5 times the circuit Z,
there is essentially No Flux generated in the core at all! I conclude if
there is no flux (due to equal and opposite current flow), then there
can be No Distortion created in this xmtr. And the core operates stone
cold.
73, Roy K6XK
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