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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 6/30/07 8:29 PM, in article , "John Smith I"
wrote: Don Bowey wrote: ... This will not happen in a properly designed transmitter. It is not a characteristic of AM. In fm, it is not unusual for a small "amplitude modulation" to be generated, as the varying/spanning of freq(s) is caused by the modulation, some changes in fm carrier can be generated. In an imperfect world, nothing is "perfect." Regards, JS Listen to a "strong--pure am signal" on an fm receiver, turn up the volume on the fm receiver, something is responsible for that ... repeat experiment with the reverse ... "imperfect world theory" proof! You are hearing the effects of the sidebands, not the Carrier. In new equip (I started out decades ago, remember) voltage regulation, filters, suppressors have much improved ... digital processing is king and allows what analog never could achieve ... Regards, JS In a properly designed transmitter the Carrier amplitude does not change with modulation. I have better tools than FM receivers to prove that fact and theory agree for AM. |
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-lowcarrier frequency
Don Bowey wrote:
... You are hearing the effects of the sidebands, not the Carrier. DUH! And, you only have the sidebands as a result of the carrier/modulation ... In a properly designed transmitter the Carrier amplitude does not change with modulation. I have better tools than FM receivers to prove that fact and theory agree for AM. And the time to argue the insignificant ... sharpen that razor blade, you can then successfully split much narrower hairs ... JS |
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AM electromagnetic waves: 20 KHz modulation frequency on anastronomically-low carrier frequency
On 6/30/07 8:50 PM, in article , "John Smith I"
wrote: Don Bowey wrote: ... You are hearing the effects of the sidebands, not the Carrier. DUH! And, you only have the sidebands as a result of the carrier/modulation ... So what? You implied or inferred that what was heard from the FM radio was caused by the AM Carrier. Leave out the Carrier and you will hear the same thing. In a properly designed transmitter the Carrier amplitude does not change with modulation. I have better tools than FM receivers to prove that fact and theory agree for AM. And the time to argue the insignificant ... sharpen that razor blade, you can then successfully split much narrower hairs ... It is important that we not confuse a person new to electronics by the type of inane points you make. It doesn't matter a whit if someone's AM transmitter Carrier shifts on power peaks due to poor regulation. It has nothing to do with "AM" and everything to do with poor design. Side issues don't help the new folks. JS |
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