Thanks to all who replied.
I used to design fiber optic systems, among my other system design tasks, and am aware of the fact the receiver cannot sometimes track the source because of long delays in the cable or fiber.? I have slowed the sweep and have not noticed any appreciable discrepancies with the data.? So my conclusion is that using a 30 Meter (my tip of the hat to Dr, Kirkby) cable should enact the calibration, and would not be an issue for the 8753C.? I agree with Tom about only the phase being a factor in the port extensions.? But I am not using port extensions.? I have a piece of software that will allow me to enter data for measurements taken at various points along a fixed length of cable, and can "BACk OUT" the cable to reflect the actual data at the calibration plane.
All of that experimentation with that software and real world measurements seem to correlate correctly.??? This question from the very beginning, excepting my original mistake, was somewhat academic.? I have been using this method for a number of years and it does work.?
I guess recently I've become a bit bored looking for some new project to undertake.
I truly respect the groups knowledge and time putting up with my questions.
Regards,
Karin
