12th April 2007 at 16:48
#38402

pix

Guest

Hi Sabir,

sorry for the late reply.

by substracting two powers, you obtain a delta of power.

And a “delta” is an attenuation…

dBm – dBm = dB

that’s correct.

a dB is a difference (or “delta”) between two powers expressed in dBm. Maybe you should refer to wikipedia if you want a more mathematical approach of this…