"Pete Bertini" wrote in
:

As an academic exercise, for example using a tapered
line to match an OCD with a known FP impedance of 200 ohms

Pete,

You really don't disclose very much, certainly not in a clear way. But,
some of your hints (eg OCD with open wire feed) leave me asking why? I am
not going to waste time writing a lot of words based on a hint though.

Owen