Is the K3s S-meter calibrated, or is there some provision for storing an S-meter calibration table?
There are S-meter ZERO and SCALE menu entries, although the default settings will usually result in 50 microvolts = “S9”, the most widely-accepted standard. Whether the S-meter compensates for the preamp and attenuator is an interesting subject. We support both modes of operation, selectable via a menu option.
