Electronic ramblings

dBm values

Since I never can remember if 1W is 30 or 40 dBm I'm just putting it down here so that I can bookmark it for further use. Might updated the table with more conversions if I need them.

dBm W dBμV
0 0.001 107
10 0.01 117
20 0.1 127
30 1 137
40 10 147
50 100 157

The table above assumes an impedance of: $ Z_0 = 50 $ which then gives

dBμV=dBm+90+20log10(Z0)dBm+106.99