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Math Help - Urgent-Unit Conversion- dBmV to dB

  1. #1
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    Urgent-Unit Conversion- dBmV to dB

    How to convert from dBmV to dB?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by wence View Post
    How to convert from dBmV to dB?
    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
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  3. #3
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    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?
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by wence View Post
    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?
    This is difficult to explain without a better idea of exactly what you
    are doing. But I spspect there is a sensitivity figure that goes with
    your apparatus, which gives mV per unit of input, which should provide
    the conversion factor.

    RonL
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