DB, which represents a relative value. When calculating A's power compared to b large or small number of db, can be calculated as the formula 10LG A/b. For example: A power is one-fold larger than B power, then 10lg A/b = 2 lg = 3dB, that is, the power of a is greater than the power of B 3dB; If the power of a 46dbm,b is 40dBm, it can be said that a is greater than B 6dB; if the a antenna is 12dBm, b antenna is 14dBm, can say a than B small 2dB. DBM is a unit of absolute power, calculated as: LG Power value/1MW. For example: if the transmit power is 1mW, the value after the conversion in dbm units should be: ten lg 1MW/1MW = 0dBm; dbm is a value for the absolute power of the test, calculated as: 10lg (Power value/1MW). [Example 1] if the transmit power P is 1mw, converted to dbm after 0dBm. [Example 2] for 40W power, the value of the conversion in dbm units should be: 10LG (40W/1MW) =10LG (40000) =10lg (4*10^4) =40+10*lg4=46dbm.
"Turn" db/dbm
