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# Signal strength

Base-10 logarithms: log10 x

log10𝑥=𝑦 ↔ 10𝑦=𝑥

dB as a power ratio - The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity. For power ratios the decibel unit is defined as follows:

𝐿𝑑𝐵=10*log10(𝑃𝑜𝑢𝑡/𝑃𝑖𝑛)

dB as a field amplitude ratio - For intensity ratios the decibel unit is defined as follows:

𝐺𝑑𝐵=20*log10(𝐴𝑜𝑢𝑡/𝐴𝑖𝑛)