For example -3dBm+30 dBm=27dB
Dbm and Db are not a unit. They are just a ratio about something. You can think that , 10/2+100/20=10=100/10=200/20=200000/20000
Sorry Tolgahan ok these are not units right but why they write summation of dBm as dB
http://cleantechnica.com/2013/09/24/new-solar-cell-efficiency-record-of-44-7-set/
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