[Elecraft] K3 S9 calibration?

[Phil & Debbie Salas]

"To ask the obvious question ... since the S-meter is derived
from the DSP and the DSP/controller should know if the preamp is
on or off, why are there not two sets of calibrations so 50 uV
at the antenna input is S9 whether the preamp is on or off?  73, Joe, W4TV "

According to Rob Sherwood, this is exactly what is done in the TenTec Omni 
VII.
Phil - AD5X