dBm
什么是dBm，先来看看维基百科上的解释：
the power ratio indecibels (dB) of the measured power referenced to onemilliwatt.It is ud in radio, microwave and fiber optic networks as a convenient measure of absolutepower becau of its capability to express both very large and very small values in a short form. ComparedBW, which is referenced to one watt(1000 mW).Since it is referenced to thewatt, it is an absolute unit, ud when measuring absolute power. By comparison, the decibel (dB) is adimensionless unit, ud for quantifying the ratio between two values, such assignal-to-noi ratio.
译作：以毫瓦为单位的分贝实测功率的功率比， 适用于表现无线电，微波，光纤网络的绝对功率。可表示非常大与非常微小的数值，与瓦分贝DMW相比较，它是以1000毫瓦(1瓦特)为单位，瓦特是绝对单位，使用它可测得绝对功率用来确定两个系数值内的数量，比如信躁比：
一般来说，信噪比越大，说明混在信号里的噪声越小，声音回放的音质量越高，否则相反。而当dBm值为负值时可用来表示雷达探测灵敏度，值越小，振幅比越大,给机器的反应也就越激烈，也就相当于雷达的灵敏度越大。
下面我们来看看各类品牌雷达探测器的dBm实验数据值：
Ka Band X Band K Band Price:CNY Model
-109.5 dBm -116.3 dBm -115.2 dBm 4500 Valentine one
-108.1 dBm -113.5 dBm -113.8 dBm 4700 Escort 9500iX
-109.1 dBm -114.3 dBm -110.9 dBm 3600 BEL-Rx65i
-108.9 dBm -114.7 dBm -115.3 dBm 5500 Bel-STi
-107.9 dBm -114.8 dBm -115.4 dBm 2800 Escort 8500 X50
-103.0 dBm -108.2 dBm -106.3 dBm 2600 Bel-V940i
-095.6 dBm -102.8 dBm -105.9 dBm 1800 Uniden LRD747
-095.3 dBm -107.7 dBm -106.8 dBm 3300 Cobra F90
-093.1 dBm -105.8 dBm -101.9 dBm 2300 Whistler 695
-092.6 dBm -104.3 dBm -096.9 dBm 3400 Whistler DE3300
-091.3 dBm -111.3 dBm -105.4 dBm 3000 Cobra XR1010
-085.8 dBm -105.7 dBm -101.3 dBm 1100 Uniden LRD957
-073.1 dBm -098.8 dBm -085.3 dBm 1680 Conquerer GX98
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067.0 dBm -095.5 dBm -068.0 dBm 1200 ZenlaneTT10
-060.0 dBm -082.1 dBm -066.0 dBm 800 Normal Brand in China
