Cingular cell phone service - Re: AM electromagnetic waves: 20 KHz modulation frequency on

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Re: AM electromagnetic waves: 20 KHz modulation frequency on

Don Bowey

2007-07-04, 10:33 pm

On 7/4/07 10:16 AM, in article 468bd5ad$0$16531$4c3
68faf@roadrunner.com,
"Ron Baker, Pluralitas!" <this@aint.me> wrote:

>
> "Don Bowey" <dbowey@comcast.net> wrote in message
> news:C2B1129D. 6D573%dbowey@comcast
.net...
>
> <snip>
>
>
> What do you mean? What is the "correct"
> relationship?
>
>
>

When AM is correctly accomplished (a single voiceband signal is modulated
onto a carrier via a non-linear process), at an envelope detector the two
sidebands will be additive. But if you independe ntly place a carrier at
frequency ( c ), another carrier at ( c-1 khz) and another carrier at (c+ 1
kHz), the composite can look like an AM signal, but it is not, and only by
the most extreme luck will the sidebands be additive at the detector. They
would probably cycle between additive and subtractive since they have no
real relationship and were not the result of amplitude modulation.

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