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Since dBm is measured on a logarithmic scale, it's easy to account for in a link budget since all losses are exponential. The small "m" in dBm denotes that it referenced to a milliwatt (so 0dBm = 1 mW, 10 dBm = 10 mW, 20 dBm = 100 mW, 30 dBm = 1 W of RF power). On the other hand, dB is a relative term only.
1 of 6 033109 EMC Formulas Term Conversion in 50Ω Environment Log dB V to dBm dBm dB V 107 dB A to dBm dBm dB A 73 dBm to dB V dB V dBm 107 dB A to dB V dB V dB A 34 dBm to dB A dB A dBm 73 dB V to dB A dB A dB V 34 Log Linear Volts to dBm dBm 20 Log(Volts) 13 Amps to dBm dBm 20 Log(Amps) 47
The table below provides a chart to convert between dBm, watts and voltage - peak to peak in a 50Ω system. Although voltage levels are unlikely to rise to significant levels which might cause damage for power levels measured in dBm, the voltages are often used in other calculations. Three tables have been included.
These short units are defined as dBm dBmV dBuV. Thus there are two kind of voltages. First is Source Voltage and second is Potential Difference. This potential difference is also called the Voltage Difference. dBm. dBm gives the signal in miliwatt. This units is used for RF devices which are having resistance of 50 ohm.
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