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Article #5Re: Question about frequency modulation
From: cpu2
Date: Thu, 28 May 2009 18:01
Date: Thu, 28 May 2009 18:01
37 lines
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2537 bytes
On Wed, 27 May 2009 09:02:36 -0700 (PDT), GreenXenon <glucegen1x@gmail.com> wrote: >Hi: > >In frequency modulation: > >Increasing the modulator�s 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 Their is no informatin in the carrier, only in the sidebands so a FM modulated 15khz tone will take at least 30khz of bandwidth. > >Increasing the modulator�s 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�s amplitude will >increase the bandwidth the carrier uses. > >I don�t understand how increasing the modulator�s frequency will >increase the bandwidth taken up by the carrier. Higher modulator >frequency simply means the carrier�s frequency will vary faster; it >will not take up more frequencies unless the mod�s amplitude >increases. > > >Thanks, > >Green
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X-Google-Thread: 6677282e41,92a1f2481226a01 X-Google-Attributes: gid6677282e41,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!news2.google.com!news.glorb.com!news2.glorb.com!nlpi057.nbdc.sbc.com!prodigy.net!flph199.ffdc.sbc.com!prodigy.com!flpi107.ffdc.sbc.com!nlpi068.nbdc.sbc.com.POSTED!eb8cb62b!not-for-mail From: cpu2 <cpu2@nowhere.com> Newsgroups: uk.tech.broadcast,alt.radio.broadcasting,aus.radio.broadcast,ba.broadcast Subject: Re: Question about frequency modulation Message-ID: <f3jt159c8je5e3v03ua61lvq9jkf06urln@4ax.com> References: <1a86fd28-bebe-4f09-8d0b-1a6685d01ce3@b34g2000pra.googlegroups.com> X-Newsreader: Forte Free Agent 2.0/32.652 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Lines: 38 NNTP-Posting-Host: 63.194.85.181 X-Complaints-To: abuse@prodigy.net X-Trace: nlpi068.nbdc.sbc.com 1243533717 ST000 63.194.85.181 (Thu, 28 May 2009 14:01:57 EDT) NNTP-Posting-Date: Thu, 28 May 2009 14:01:57 EDT Organization: at&t http://my.att.net/ X-UserInfo1: Q[R_PJSCTS@SCSH[_P_BJFTBTR\B@GXLN@GZ_GYO^BSZUSAANVUEAE[YETZPIWWI[FCIZA^NBFXZ_D[BFNTCNVPDTNTKHWXKB@X^B_OCJLPZ@ET_O[G\XSG@E\G[ZKVLBL^CJINM@I_KVIOR\T_M_AW_M[_BWU_HFA_]@A_A^SGFAUDE_DFTMQPFWVW[QPJN Date: Thu, 28 May 2009 11:01:57 -0700