不同 ! 不同 ! 參考下連結http://www.x-com.com.tw/radio/tech/radio_unit.htmdBw = decibels relative to one wattdBm = decibels relative to one milliwatt
-159dBm = 125E-21 = -189dBw189dB - 172dB = 17dB10^(17/10) = 50SiRF III can picks up weaker signal 50 times better then the SiRF II.