Help understanding voltage db vs power db.

amdx · 2020-04-17T12:02:19+00:00

The fact that I know: a 6db voltage gain is a 3db power gain. If that is wrong set me straight. I'm confused after using this calculator. The first calculator labeled, ? Find decibel voltage gain and ratio out/in by entering input and output voltage:? If I put 1 volt on the input line and 2 volts on the output line, the calculator gives a 6db gain. The second calculator labeled, ?Find decibel power gain and ratio out/in by entering before and after power? In order to enter power in Watts, I'll assume a 50 ohm system and calculate power using V^2/R=P. As above 1volt^2/50 =0.02 Watts for input power and 2^2/50=0.08 Watts for output power. When I enter 0.02 and 0.08 into the second calculator, I get 6db power gain. Back to the fact that I know, a 6db voltage gain is a 3db power gain. So, what am I doing wrong that I don't get 3db for the power? Thanks for your time, Mikek