hat
dB se yon genyen pouvwa nan apatman an, te di se yon valè manm fanmi. Lè kalkile pouvwa Yon nan gwo oswa piti konpare ak B ki kantite dB, dapre fòmil la 10 lg A / B kalkil. Pou egzanp: Yon pouvwa pouvwa pase de fwa ki gwo tankou B, lè sa a 10 lg A / B = 10 lg 2 = 3dB. Nan lòt mo, yon nan pouvwa sou B pouvwa gwo 3dB ;, si Yon nan pouvwa a 46dBm, pouvwa B a se 40dBm, ou ka di, yon sou B-6dB; si Yon antèn 12dBd a, B antèn 14dBd, li kapab di
eng
dB is a power gain of the unit, said a relative value. When calculating the power A large or small compared to B the number of dB, according to the formula 10 lg A / B calculations. For example: A power power than twice as large as B, then 10 lg A / B = 10 lg 2 = 3dB. In other words, A's power over B power large 3dB;, if A's power of 46dBm, B's power is 40dBm, you can say, A over B-6dB; if the A antenna 12dBd, B antenna 14dBd, it can be said