User`s guide

BreezeNET DS.11 Series User’s Guide
C-2
The electromagnetic wave is intercepted by the receiving
antenna, which converts it back to an RF signal. Ideally, this
RF signal is the same as that originally generated by the
transmitter. The original information is then demodulated
back to its original form.
RF Terms and Definitions
dB
The dB convention is an abbreviation for decibels. It shows
the relationship between two values.
RF Power Level
RF power level at either the transmitter output or the
receiver input is expressed in Watts. It can also be expressed
in dBm. The relation between dBm and Watts can be
expressed as follows:
P
dBm
= 10 x Log P
mw
For example: 1 Watt = 1000 mW; P
dBm
= 10 x Log 1000 =
30 dBm
100 mW; P
dBm
= 10 x Log 100 = 20 dBm
For link budget calculations, the dBm convention is more
convenient than the Watts convention.
Attenuation
Attenuation (fading) of an RF signal is defined as follows: