200 (197 on my DVM) ohm termination:

R 155 S 051 Z 197

75 (74.5 on my DVM) ohm termination

R 047 S102 Z 146

With the cap sweep, with two different caps (a 100pF doorknob and a
30pF air variable trimmer), R is almost never zero until I get up into
the 60MHz+ range and even then, rarely.

With the coax check, the SWR oscillation amplitude is about 0.2 or so;
1.1-1.3. R and X vary smoothly and more or less cyclically.. I guess
the oscillatory SWR variation with frequency is incorrect... I do get
more than you mentioned and more than one might expect... i've got
about 40 feet of RG-55U terminated in the 74.5 ohm termination that I
used above.

- - - - - -

From what you've said, it seems like alignment time. I guess the large
resistive component on capacitors at low frequency is a numerical
artifact of a slight misalignment... because the R S Z menu values are
really fairly close to yours. I'll build or find some precise SMT
terminations and go at it. Thanks much for your help and I'll post
after I do the alignment.

73,
Dan