As expected - verifying by using known length of KNOWN coax it is easily said then done ....
I found "Belden YR 16664 " "factory cable" and cannot find any data on it...
I found piece of worn-out what appears RG8 with barely readable description reading "microwave cable" .....useless
The u-tube is all about selecting menus on nanoVNA - I have given up on the menus long time ago ( my choice ).
I can get "TDR" on nanoVNASaver main display , but I cannot figure out how to "update" it....
...and coaxial cable is manual option AFTER "Time domain retroreflectormetry ... " is selected .... my error , but that does give option for VF ....
In theory - TDR can measure cable length - when the distant end is open - hence using reflection
OR it can measure "fault" AKA when there is known good coaxial cable and the distant end is shorted.
After all this is appears the measurement posted ( in nanoVNASaver) is physical length.
But still not verified, just a best guess for now.
