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# Signal strength

The signal strength of an RF wave is the amount of power that is available in the wave. As the wave travels further from the source, the energy is spread out in all directions and the power of the signal decreases. The signal strength reduces as we go further away from the source.

Power is generally measured in Watts or milliWatts (mW). However, the strength of an RF signal is generally measured in dBm. Power in Watts can be converted into dBm using the following formula:

Figure 1: Converting absolute power to dB

Hence, 1 mW power will be equal to 0 dBm, 10 mW of power is 10 dBm, and 0.1 mW of power is -10 dBm. As a general ...

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