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Article #6Re: Question about frequency modulation
From: GregS
Date: Thu, 28 May 2009 18:26
Date: Thu, 28 May 2009 18:26
28 lines
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2142 bytes
In article <1a86fd28-bebe-4f09-8d0b-1a6685d01ce3@b34g2000pra.googlegroups.com>, GreenXenon <glucegen1x@gmail.com> wrote: >Hi: > >In frequency modulation: > >Increasing the modulator=92s amplitude will increase the extent to which >the carrier frequency varies from baseband. In other words, a larger >modulation amplitude will cause the carrier to occupy a larger range >of frequencies than a smaller modulation amplitude > >Increasing the modulator=92s frequency will increase the rate in which >the carrier frequency changes. So why is it impossible to transmit a >higher-frequency modulator signal on a lower-frequency FM carrier >signal? > >I can understand how increasing the modulator=92s amplitude will >increase the bandwidth the carrier uses. > >I don=92t understand how increasing the modulator=92s frequency will >increase the bandwidth taken up by the carrier. Higher modulator >frequency simply means the carrier=92s frequency will vary faster; it >will not take up more frequencies unless the mod=92s amplitude >increases. It would be easiest to see by looking at the spectrum with a spectrum analyzer. The wider the frequencies will take up a wider space. greg
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X-Google-Thread: 6677282e41,92a1f2481226a01 X-Google-Attributes: gid6677282e41,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!news.glorb.com!solaris.cc.vt.edu!news.vt.edu!elk.ncren.net!usenet01.sei.cmu.edu!pitt.edu!Q From: zekfrivo@zekfrivolous.com (GregS) Newsgroups: uk.tech.broadcast,alt.radio.broadcasting,aus.radio.broadcast,ba.broadcast Subject: Re: Question about frequency modulation Date: Thu, 28 May 2009 18:26:44 GMT Organization: some Lines: 28 Message-ID: <gvml13$qgb$2@usenet01.srv.cis.pitt.edu> References: <1a86fd28-bebe-4f09-8d0b-1a6685d01ce3@b34g2000pra.googlegroups.com> NNTP-Posting-Host: q.cbp.pitt.edu X-Trace: usenet01.srv.cis.pitt.edu 1243535203 27147 136.142.52.90 (28 May 2009 18:26:43 GMT) X-Complaints-To: usenet@imap.pitt.edu NNTP-Posting-Date: Thu, 28 May 2009 18:26:43 +0000 (UTC) X-Newsreader: News Xpress 2.01