Lyle Johnson wrote:
We have a total of three characters available, and we wanted to express
that this was a dB value, and it was voltage based. So we used dBV.
Into a linear load, and I presume we have one here[A], there is no
difference between dB relative to a voltage, using the 20 log10,
voltage, formula and dB relative to the power corresponding to that
voltage using the 10 log10. power, formula. The difference between 10
and 20 is to account for the need to square the voltage to get the power.
In this case the units should be bare dB. You will still have problems
because of the large number of people who don't know the definition of a
dB and are only used to seeing dB's relative to some defined standard.
[A] strictly speaking the load at any one stage could be non-linear, as
long as the total system, through to the air outside the speaker
believes in a linear way.
--
David Woolley
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Elecraft products and more general topics related ham radio"
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