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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> Newsgroups: sci.electronics.design Subject: Re: How does a mixer work? References: <tfk1ruc66l5qgno8dcc55qjbmed56mrrlv@4ax.com> <3DB2E3CE.1050500@nospam.com> <3db31e4c.8383876@news.texas.net> <3DB41488.0@nospam.com> Organization: The Armory X-Newsreader: trn 4.0-test69 (20 September 1998) From: rstevew@deeptht.armory.com (Richard Steven Walz) Date: 22 Oct 2002 05:33:23 GMT Message-ID: <3db4e323$0$79557$8eec23a@newsreader.tycho.net> NNTP-Posting-Host: da8f861a.newsreader.tycho.net In article <3DB41488.0@nospam.com>, Fred Bloggs <nospam@nospam.com> wrote: > >John Fields wrote: >> On Sun, 20 Oct 2002 17:11:22 GMT, Fred Bloggs <nospam@nospam.com> >> wrote: >> >>>>Don Pearce wrote: >>>>You are still assuming incorrectly that the Carrier of an AM signal >varies with >>>>modulation. It does NOT; the carrier amplitude is easily proved to >be constant >>>>with correct levels of modulation. In your experiment you are varying the >>>>amplitude of the carrier and that is not an AM signal. >>> >> --- >> The incorrect assumption is yours. If there was no variation in the >> amplitude of the carrier when it was being modulated what would you >> postulate would be the mechanism involved in generating the >> sidebands? It's called Amplitude Modulation for a reason, I >> believe, that reason being that the carrier amplitude is caused to >> vary by the modulating source. >> >> Perhaps what you're thinking about is the _average_ (instead of the >> instantaneous) amplitude of the carrier, which doesn't vary with >> modulation, since the peaks and the valleys average out. Consider >> the case of 100% modulation, for instance. With no modulating >> source the carrier amplitude will be at some nominal value, while >> with the modulating source at a minima the amplitude of the carrier >> will be zero, while with the modulating source at a maxima the >> amplitude of the carrier will be twice what it is in the quiescent >> state. >> >>>Right, AM is usually of the form (1+cos(Wm x t))* sin(Wc x t) and this >>>expands to sin(Wc x t) + [sin( (Wc+Wm) x t) + sin( (Wc-Wm) x t)]/2 which >>>is easily recognized as the carrier, of constant amplitude, and two >>>sidebands displaced from carrier by Wm, and this is exactly how AM is >>>implemented. So, you are right, the pot analogy is hopelessly flawed. >> >> The pot analogy is perfect and is precisely _how_ AM is generated. >> _You've_ also fallen into the trap of looking at average instead of >> instantaneous carrier amplitude during _amplitude_ modulation. As >> I noted previously, if the amplitude of the carrier wasn't varied >> there would be no way to impress information on it with the >> resultant sidebands being generated. We're taking AM here, Bloggsy, >> not FM or PM or any other kind of M, so don't try to wiggle out of >> it, you're just _wrong_. Own up to it. >> >> John Fields >> Professional circuit designer >> http://www.austininstruments.com > >You're a dumbass who knows absolutely nothing about frequency analysis >of any kind. The AM equation is clear to anyone with even a second year >level of engineering education in Fourier analysis- which you do not >possess. -------------- Gee, even if HE didn't, *I* do, and YOU'RE WRONG! >The composite signal consists of a constant amplitude carrier >with sidebands on either side displaced by the center frequency of the >bandlimited modulation function. ----------------------------- Do you even KNOW that such a signal IS produced by a pot-like circuit of which he is speaking??? It *IS*! >It's a sorry commentary on your >pathetic level of development that after 40 years you still do not >comprehend the idea of superposition. --------------------- We understand superposition, but you simply don't grasp all the ways that such a superposition CAN be achieved! Simple variation of a POT across a carrier CAN INDEED DO IT *PERFECTLY*! Lots of people fall into the same trap as you did, they simply will not conceive that something as apparently complex as the sidebands of a complex signal can be produced simply by the process of dialing a knob!! BUT THEY CAN AND ARE! >Well why would you? Your work >experience has required absolutely nothing beyond the most basic hands on-) --------------------------- I'm a physicist, he knows what he's talking about, and you're blathering nonsense! -Steve </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>