hat
dB pouvwa benefis nan apatman an se ke yon valè relatif. Yon kalkil ki gen pouvwa a lè yo konpare ak gwo oswa ti kantite B dB, dapre fòmil la 10 LG A / B kalkil. Pou egzanp: A pouvwa double pouvwa pase B, Lè sa a, 10 LG A / B = 10 LG 2 = 3dB. Nan lòt mo, A pouvwa sou B, 3dB gwo pouvwa, si pouvwa Yon a se 46dBm, pouvwa B a nan 40dBm, ou ka di, A sou B-6dB; Si yon antèn 12dBd, B antèn 14dBd, li kapab di Yon pi piti pase B 2dB.
eng
dB power gain of the unit is that a relative value. A calculation of the power when compared to large or small number of B dB, according to the formula 10 lg A / B calculation. For example: A power doubled power than B, then 10 lg A / B = 10 lg 2 = 3dB. In other words, A's power over B, high power 3dB; if the A's power is 46dBm, B's power of 40dBm, you can say, A over B-6dB; if A antenna 12dBd, B antenna 14dBd, it can be said A smaller than B 2dB.