Note 1: Weighted noise power in dB is referred to 1.0 picowatt. Thus, 0dBrn = -90 dBm. Use of 144 line, 144-receiver, or C-message weighting, or flat weighting, must be indicated in parentheses as required.
Note 2: With C-message weighting, a one-milliwatt, 1000-Hz tone will read +90 dBrn, but the same power as white noise, randomly distributed over a 3 kHz band will read approximately +88.5 dBrn (rounded off to +88 dBrn), because of the frequency weighting.
Note 3: With 144 weightings, a one milliwatt, 1000 Hz white noise tone will also read +90 dBrn, but the same 3 kHz power will only read +82 dBrn, because of the different frequency weighting.
dBrn or dB(rn) is an abbreviation for decibels above reference noise.
Use of 144 line, 144-receiver, or C-message weighting, or flat weighting, must be indicated in parentheses as required.
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors.
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