[Elecraft] Re:K3 S-meter calibration

[Bryan]

Hi,

I am fully satisfied with my K3 s/n 181, in every respect, it exceeds my expectations, thank you Elecraft and company.  I am puzzled by the reference on page 9 to Nom S9=50microvolts, preamp on, and for the setup of [MAIN] SMTR SC. As arrived the settings gave me S9 as 50microvolts, preamp off,  using my XG1.  I seem to have been puzzled when I built my K2, s/n 4421 as well.
Whats the correct method ?

73 Bryan  GM3AKF