--- In softrock40@..., Alberto I2PHD <i2phd@w...> wrote:
Tony,
I beg to differ. Not to be a nit picker, but in the interest of the
other group readers who could be misled by that sentence.
When you specify a ratio in dB, it is immaterial whether you refer to
powers or voltages. A ratio of e.g. 15 dB is 15 dB no matter if you
consider voltages or powers. Let's make an example :
Suppose the ratio between two voltages is 5:1 i.e. 10V against 2V
Computing dBs : 20 * log10(10/2) = 13.9794... dB
If those voltages are applied to identical loads, then the power ratio
would be (10^2)/(2^2) = 25
Computing dBs : 10 * log10(25) = 13.9794.... dB
So tha ratio is still 13.9794... dB, whether you consider voltages
or powers. As said, no polemic intent in this message, just to avoid
that others can be misled.
73 Alberto I2PHD
Alberto,
Of course you are right and thanks for pointing this out. The
discrepancy definitely needs to be investigated.
73 de Phil N8VB
