Cingular cell phone service - Re: AM electromagnetic waves: 20 KHz modulation frequencyonanastronomically-low carrier frequency

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Re: AM electromagnetic waves: 20 KHz modulation frequencyonanastronomically-low carrier frequency

Ron Baker, Pluralitas!

2007-07-05, 10:33 am

"John Fields" < jfields@austininstru
ments.com> wrote in message
news:8ktp839la05dj6t
049kidjbpkj7rkf98ii@
4ax.com...
> On Thu, 5 Jul 2007 00:00:45 -0700, "Ron Baker, Pluralitas!"

<snip>

>
> ---
> The first example is amplitude modulation precisely _because_ of the

Is there multiplication in DSB? (double sideband)

> multiplication, while the second is merely the algebraic summation
> of the instantaneous amplitudes of two waveforms.
>
> The circuit lists I posted earlier will, when run using LTSPICE,

I think you did
(sin[] + 1) * (sin[] + 1)
not
sin() * sin()

> show exactly what the signals will look like using an oscilloscope
> and, using the "FFT" option on the "VIEW" menu, give you a pretty
> good approximation of what they'll look like using a spectrum
> analyzer.
>
> If you don't have LTSPICE it's available free at:
>
> http://www.linear.com/designtools/software/

Yes, I have LTSPICE. It is pretty good.

>
>
> --
> JF

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