rfidea
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Use the relationship between voltage and power, P = Vp^2/(2R). So, is your source resistance is RS and the load resistance is RL the voltage gain is
Gv = Vout/Vin = sqrt(Pout*2*RL)/sqrt(Pin*2*RS) = sqrt(Gp)*sqrt(RL/RS)
or in decibel
Gv,dB = 20*log(Gv) = 10*log(Gp)*10log(RL/RS) = Gp,dB*10log(RL/RS)
Usually both your signal source and spectrum analyser is 50 ohm. Is your inputs and outputs designed for handling that?
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