So berechnen Sie Decibelm W
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Converts between power ratios and decibel scale for audio, RF, and other applications. Logarithmic scale matches human perception.
Formel
dBm = 10 × log10(P ÷ 0.001)
- P
- P value — Variable used in the calculation
Schritt-für-Schritt-Anleitung
- 1dBm = 10 × log10(P ÷ 0.001)
- 2dBW = 10 × log10(P)
- 3Reverse: power (watts) = 10^(dBm ÷ 10) ÷ 1000
- 4Every 3 dB ≈ 2× power
- 5Every 10 dB ≈ 10× power
Gelöste Beispiele
Eingabe
Power 1W
Ergebnis
30 dBm
Häufige Fehler vermeiden
- ✕Confusing dBm (power) with dBV (voltage) with dBu (relative to 0.775V)
- ✕Adding dBm values instead of multiplying power
Häufig gestellte Fragen
Why use decibels instead of watts?
Logarithmic scale compresses large ranges (1W to 1MW becomes 30 dBm to 60 dBm), easier comparison.
What's typical dBm for audio and RF?
Audio -20 to +4 dBu typical; WiFi transmit +17 to +30 dBm; cellular -30 to +33 dBm.
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