Just a quick conceptual question. If you have a sinusoidal signal of 3kHz with an amplitude of A, and it's going through a modulator, and then going through a demodulator, must the output of the modulator resemble exactly to the original signal? The reason why I am asking is because when I was doing this in my lab, the output of the modulator had the same frequency of the original signal, but 1/10 of the Amplitude. I thought it would have A/4 instead. Comments?