On Sun, 7 Jun 2009 10:54:46 -0700 (PDT), dykesc
wrote:

Do you use the MFJ-259B at the load, or through the line?

Through the line Richard.

OK. Then you need to consider that the line is transforming the load
Z to the Z measured (by both methods) at the line input. I realize
you already appreciate this. However, the length of the line in
wavelengths also casts more exaggerated results into your computation
when that length is not a multiple of odd eighth wavelengths. This
suggestion comes from Walt Maxwell's own work and sidenotes to his
measurements as published in any of his several releases of
"Reflections." Read his commentary on this for more detail.

73's
Richard Clark, KB7QHC