Reg Edwards wrote:
John, what with the unwanted interference from Richard Clark, you'll
just have to accept the fact that the ferrite material has little or
no effect on transmission through the short length of transmission
line, be it coax or twin-line, wound on the ferrite core.

Maybe it would help to say "... on transmission of differential
signals through the short length of transmission line ...".
--
73, Cecil http://www.qsl.net/w5dxp