Does anyone know the right meaning of dBu?

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AN56

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Hi All,

Does anyone know the right meaning of "dBu".
That is different from dB-microvolt or db-micro.
This terms is used in radowave propagation maps to indicate the field strength or a relevant parameter.

Best Regards,
AN56 :smile:
 

Hi AN56,

to my knowledge, dBu is used in telephony and audio for expressing absolute voltage levels.
0 dBu (the reference level) is defined as the RMS voltage level that on a 600 ohms resistor produces a power of 1 mW.
Then, 0 dBu = 0.7746 V RMS.
[Vref = sqrt(1mW*600ohms ]
Regards

Z
 

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