dBm is decibel above a 1-milliwatt (mW) reference.

- A 1-Watt transmitter has an output of +30 dBm.
- A 10-Watt transmitter has an output of +40 dBm.
- A 25-Watt transmitter has an output of +44 dBm.

As can be seen, changing from dBW to dBm is simply a matter of adding or subtracting 30.

Portions of this text are provided by Brian Henderson and can also be found in his Program Operating Guide.

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