Discussion
A transmitter delivers 20 W. What is this in dBm?
Answer: D
One watt is 30 dBm, and twenty is thirteen decibels above one:
\[ 30 + 10\log_{10} 20 \approx 30 + 13 = 43 \]
so 43 dBm. Building the answer from the familiar anchor of 30 dBm for a watt, and adding ten decibels per factor of ten and three per factor of two, avoids reaching for a calculator. Twenty watts is a common transmitter rating and 43 dBm is worth recognising on sight.
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