Hi

For using DiSlord Coax function, I guess that it's rather to start with the minimum frequency of the NanoVNA-H4 does ,
- around 10Khz start frequency .
-to stop with just the frequency given a little more then Half turn of smith Shart .
- calibration with 401 Sweep points , done just before Coax measurement at this optimum Start/Stop band.
- accuracy should also depend on the long of the Coax, will be better with longuer coax as good as we have the external physical length value given by a classic meter accurately. Vp setting should be adjusted to display the exact phisical length with three significant digits at least.

Still no enought infos about losses values measurement accuracy of DiSlord Method.... it should be at least related to the cautions above.

73's Nizar