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

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Re: AM electromagnetic waves: 20 KHz modulationfrequencyonanastronomically-low carrier frequency

isw

2007-07-06, 12:33 pm

In article <C2B399E5. 6DB60%dbowey@comcast
.net>,
Don Bowey <dbowey@comcast.net> wrote:

> On 7/5/07 10:27 PM, in article 468dd266$0$20597$4c3
68faf@roadrunner.com,
> "Ron Baker, Pluralitas!" <this@aint.me> wrote:
>
>
> AM is a process. DSB (double sideband), with carrier, is it's most simple
> result. DSB without carrier (suppressed carrier dsb) requires using, at
> least, a balanced mixer as the AM multiplier.

And requires, for proper reception, that a carrier be recreated at the
receiver which has not only the amplitude of the original, but also its
exact phase. Absent some sort of "pilot" to get things synchronized,
this makes reception very difficult.

Isaac

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