On Tue,1/19/2016 1:57 PM, Bill Somerville wrote: > those Xonar numbers don't sound like dB figures, at least that's what I > assume since 70dB would be unrealistically high.
dB with no reference is simply the 10x the log of the ratio of two power levels. If the impedance is the same, it is 20x the log of the ratio of two voltage levels. 70 dB could, for example, be the voltage gain of an amplifier. dBv is an actual voltage referenced to 1 volt, independent of impedance. dBu is an actual voltage referenced to 0.78 volt, independent of impedance. dBmw is actual power referenced to 1 mw, and includes the impedance of the circuit. dBuV is the voltage referenced to 1 microvolt. 73, Jim K9YC ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
