Discussion
Why does a link budget work in decibels rather than in linear ratios?
Answer: D
Purely for arithmetic convenience, and it is a large convenience. Because the decibel is logarithmic, every amplifier gain, cable loss, antenna gain and path loss in a chain is added rather than multiplied, so a link budget is a column of figures that can be checked by eye and modified by inspection. Accuracy is identical, since the conversion is exact. Absolute levels are expressible either way, with dBm and dBW being simply logarithmic forms of milliwatts and watts. And a linear ratio below unity represents a loss perfectly well; it is just harder to accumulate across twenty stages without error.
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