1-40 Log or dB Gain or mw 11   12.5 10               10 9                 8 8                 6.25 7                 5 6                 4 5                 3.125 4                 2.5 3                 2 2                 1.6 1                 1.25 0                 1 -1                 0.8 -2                 0.625 -3                 0.5 -4                 0.4 -5                 0.312 -6                 0.25 -7                 0.2 -8                 0.16 -9                 0.125 -10                 0.1 -11                 0.08 The figures in the above listing are not precise, but are accurate for most applications. For figures in between the above numbers, logarithm interpolation must be done. Table 1-34 provides a seven-place table of common logarithms. The following are examples of power conversion: Example 1: