| Dbrn |
Articles about Dbrn |
Information AboutDbrn |
| CATEGORIES ABOUT DBRN | |
| mechanics | |
| units of measure | |
|
The symbol dBrn or '''dB(rn)''' is an abbreviation for ''' Decibels above Reference Noise '''. Weighted Noise Power in dB is referred to 1.0 Picowatt . Thus, 0 dBrn = -90 DBm . Use of 144 Line , 144-receiver, or C-message Weighting , or Flat Weighting , must be indicated in Parentheses as required. 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. 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 . REFERENCES |
|
|