[Elecraft] K3: S meter calibration

[Graham Kimbell (G3TCT)]

I get very optimistic readings on my S meter above S9.  I calibrated the S meter on 7MHz as per instructions and everything seemed ok with SMTR OF =26. According to my calculation 50uV is -73dBm. I increased the input and got the following readings:-

-53dBm (should be S9+20) reads 9+30 on 6m and 9+35 on 40m
-43dBm (sh be S9+30) reads 9+45 on 6m and 9+55 on 40m
-37dBm (sh be S9+36) reads S9+60 on 6m and would be more on 40m if the meter went further.

Anyone else notice this?
Should I change the value of SMTR SC and if so, to what?

Graham