| Re: Spectrum of a Modem Signal |
|---|
> If I plot the spectrum of a short modem signal, what should I expect
> to see?
> It just looks like a lump in the frequency domain, but I'm not sure I
> did it right.
A standard dial modem must operate over a band-limited channel between
approx 300 to 4000 khz. Therefore it's analog output frequencies
should fall within this band. Some harmonics may appear outside this,
but they would be spurious.