Regarding the comments to alter the scale settings for the S-Meter, all I can say is that with the current firmware (MCU firmware 1.66) and the suggested default settings, the K3 S-Meter is the most accurate I've ever measured.

For S9 at -73 dBm (50 uV PD), S9 +20 occurs at -53 dBm, + 40 at -33 dBm and +60 at -13 dBm. It isn't quite so good below about S6 or S7, but heck it's not broken so lets not try to fix it!

73 Dave, G4AON
K3/100 #80

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