S Meter Callibration

Posting more as a place holder really.... the values are for my PIC/AVR project I am listing the 'standard' S meter scale for the ADC.

The values are: S Points, Voltage into 50 ohms, dBm into 50 ohms

S0
0.1uV
-127dBm

S1
0.2uV
-121dBm

S2
0.4uV
-115dBm

S3
0.8uV
-109dBm

S4
1.58uV
-103dBm

S5
3.16uV
-97dBm

S6
6.3uV
-91dBm

S7
12.6uV
-85dBm

S8
25uV
-79dBm

S9
50uV
-73dBm

These values are valid on HF. on VHF, values are 20dB lower e.g. S9 is 5uV or -93dBm. I do not think many commercial transceivers adhere all that closely to this scale.