How to convert from dBmV to dB?

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- Oct 17th 2006, 12:10 AMwenceUrgent-Unit Conversion- dBmV to dB
How to convert from dBmV to dB?

- Oct 17th 2006, 02:15 AMCaptainBlack
Not enough information a dB is always relative to some reference

unit, 1 dBmV is 1 dB re 1mV, so to do a conversion we need to know

the new reference unit.

A non referenced dB measurement can be used for a gain but then

the unstated reference unit is the input.

RonL - Oct 17th 2006, 02:39 AMwence
Hi read the dBmV value (-70) from the spectrum analyzer. Do you mean i need a reference voltage or a reference input voltage, only then i can calculate the dB value?

- Oct 17th 2006, 03:19 AMCaptainBlack