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Reply To: db & dbm

#64114
pix
Guest

dB is a “relative” difference between 2 measurements in dBm.

for example :
RxLev = -80dBm
When the signal increases by 3dB, the new RxLev is -77dBm.

CRO is an offset applied on the formula of C2.

C2 = rxlev – RXLEVACCESSMIN + CRO
rxlev-RXLEVACCESSMIN = dBm – dBm = dB
CRO is also in dB
C2 is in dB
C2 represents the difference of signals levels “rxlev” and “RXLEVACCESSMIN”, plus a certain offset.

dBm represents a received power :
0dBm = 1mW
-3dBm = 0.5mW
-6dBm = 0.25mW

dB is “relative” 🙂

look for other threads about this, you’ll find plenty.

regards
pix