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dBrn or '''dB(rn)''' is an abbreviation for ''' Decibels above Reference Noise '''. ''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. Source: from Federal Standard 1037C and from MIL-STD-188 |
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