Thread: AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
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Old July 1st 07, 04:19 AM posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
Don Bowey Don Bowey is offline
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Default AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 6/30/07 7:01 PM, in article
, "Radium"
wrote:

On Jun 30, 3:46 pm, Jeff Liebermann wrote:

With AM, it's ALWAYS the high frequency
that acts as the carrier
and the lower that acts as the modulation.

In AM, isn't the carrier the signal which always maintains a constant
frequency and only varies by amplitude?

No! The Carrier amplitude is constant. Sidebands are generated in the
modulation process. At 100% modulation, each sideband has 25% as much power
as the Carrier. The sideband signals vary in amplitude, following the
modulation signal.



If a carrier signal varies by anything other than just amplitude, then
it isn't AM. Right?


You repeat yourself, and the answer is still no.


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