I was just asked by PM what Rt is in my sketch here:
http://www.karinya.net/g3txq/temp/s21/vna.png
For others who may be wondering it is part of the representation of the
choke. In other words the impedance of the choke would be Z=Rt+jwL.
The sketch was left over from a different discussion - I should have
tidied it up before posting! Just ignore anything drawn between
terminals A & B, but remember that's where you connect the choke :)
Steve G3TXQ
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