TELECOM Digest OnLine - Sorted: Re: Spectrum of a Modem Signal

Re: Spectrum of a Modem Signal

Reed (reedh@rmi.net)
Wed, 10 May 2006 01:46:12 GMT

mike7411@gmail.com wrote:

> 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.

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