July 10th 07, 04:22 PM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
|
|
external usenet poster
|
|
First recorded activity by RadioBanter: Oct 2006
Posts: 89
|
|
AM electromagnetic waves: 20 KHz modulation frequencyonanastronomically-low carrier frequency
In message , Don Bowey
writes
On 7/10/07 3:26 AM, in article ,
"Jimmie D" wrote:
"Ron Baker, Pluralitas!" wrote in message
...
"Dana" wrote in message
...
"Ron Baker, Pluralitas!" wrote in message
...
Do you understand that a DSB signal *is* AM?
So all the AM broadcasters are wasting money by
generating a carrier?
How did you jump to that conclusion.
Is "DSBSC" DSB?
I see Jimmie talked all around your question.
I'll answer it AGAIN, though I'm still sure your only a troll.....
DSB says nothing about the carrier; DSBSC is still DSB.
You can have DSBSC (Suppressed Carrier), DSBRC (Reduced Carrier), and DSB
with Full Carrier. You can look up the abbreviation for the latter if you
need it.
Broadcast medium wave radio, slang term "AM Radio," is DSB with full
Carrier.
There have been attempts to remove the carrier but receivers could not be
manufatured at a reasonable price that would demodulate the signal with the
fidelity of an AM BCB signal. Probably could be done today but what would
you l do with all those AM rx that suddenly dont work when the transition is
made.
Just out of interest....
http://www.vkham.com/vk8da/documents...fOperation.pdf
Ian.
--
|