Paano Kalkulahin si Decibelm W
Ano ang Decibelm W?
Converts between power ratios and decibel scale for audio, RF, and other applications. Logarithmic scale matches human perception.
Pormula
dBm = 10 × log10(P ÷ 0.001)
- P
- P value — Variable used in the calculation
Step-by-Step na Gabay
- 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
Mga Nalutas na Halimbawa
Input
Power 1W
Resulta
30 dBm
Mga Karaniwang Mali na Dapat Iwasan
- ✕Confusing dBm (power) with dBV (voltage) with dBu (relative to 0.775V)
- ✕Adding dBm values instead of multiplying power
Mga madalas itanong
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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