Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8E27638000081; Sun, 11 Mar 2012 09:18:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1S6ieM-0001Ub-TS for rs_out_1@blacksheep.org; Sun, 11 Mar 2012 13:17:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1S6ieM-0001US-CT for rsgb_lf_group@blacksheep.org; Sun, 11 Mar 2012 13:17:26 +0000 Received: from nm4-vm0.bullet.mail.ird.yahoo.com ([77.238.189.211]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1S6ieL-0000mq-Bb for rsgb_lf_group@blacksheep.org; Sun, 11 Mar 2012 13:17:26 +0000 Received: from [77.238.189.52] by nm4.bullet.mail.ird.yahoo.com with NNFMP; 11 Mar 2012 13:17:19 -0000 Received: from [212.82.108.225] by tm5.bullet.mail.ird.yahoo.com with NNFMP; 11 Mar 2012 13:17:19 -0000 Received: from [127.0.0.1] by omp1002.bt.mail.ird.yahoo.com with NNFMP; 11 Mar 2012 13:17:19 -0000 X-Yahoo-Newman-Id: 408394.15841.bm@omp1002.bt.mail.ird.yahoo.com Received: (qmail 33600 invoked from network); 11 Mar 2012 13:17:19 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=zha+z+osFWPYHryBvMWrfyQ17mKlW3CYk8doM0OGAyiGv//RZuD8QcrYAOzHP+oh10BV1gNOMKAQ1et5REl8SD3a4Z/V9vM76dRAFt38bevs1LElEHm+HsmIolVkyecK7ZACEpuYZT0TuetTZ6fFgDZm3Y4yc5ftA3dAIpvRCug= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1331471839; bh=QSq5Udi57Rji1Mw+pH2DwTIG8KgX/ClDXC53iImZhwc=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=UZfb3tyRLgZoF38yZ4vI5Jr/QBKPqetzXT5+sRSrU7MDzG/KJ8dWRyV6y/rZQmHV444PXBTLdE/XyxY0ohgPzdZYQVopmELjvjjqBMH0zSohq+Acn0//h1BptaoFF2sWDbyCcW46UDLVxVXPlxg3M759k4+5PtYgd2yMgVe22uA= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: divFOYwVM1mOfdaRqdynq2R1vrYAmHPaIOwnRDYxP.YS7ZU eTWFrYRpP3vXL4D7CxJI.nzBDSgNKzhNMbxCSklSWY2puhSmNxiGBp0.cX2x mFOlV5gQTzWGOpuqluJ5bdDAj3FONPbCwBosH1T.jaYd22hiJYydUZJGYTXW 1xAOSQOZ5DSiKZfVWOCGaGLRPGo0XeSUzwX_n4dbCMtg9NBkPPr_FBUjeKt1 dsbsc7Nev3DEp6bXN_7SbAtCj8bO0zJbxWZMXAxvqhzCm.enxI_xrzjmlTde ePjIAfeWhjAaGBUAThJoylOQB91vSTeQgXldsiNX.w.ZJ9YCDaduo_HDMX92 jFQQLnd_g7vuhBu9S6zzWI6cEWmaKggkdXfxCcyQW2z40ZjHZFO8Q18IDR9S Q_hF3QYqD1bMmsDP9Hyy.8KarF93WC4aa7THqWU1aufKhxKUigIZLYhXfPtI 0oRW4 X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- Received: from JimPC (james.moritz@86.185.144.57 with login) by smtp825.mail.ukl.yahoo.com with SMTP; 11 Mar 2012 06:17:18 -0700 PDT Message-ID: From: "James Moritz" To: References: In-Reply-To: Date: Sun, 11 Mar 2012 13:17:17 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: LF: Re: + 7dB in 424uHz , convert to 2.5Khz ? Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:300496064:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d011.2 ; domain : btopenworld.com DKIM : fail x-aol-sid: 3039ac1d40d54f5ca61b267e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear Graham, LF Group, >How do you scale these uHz d/b levels to other bandwidth's ? >If the b/w is 848 uHz is the dB level + 3.5 dB ? >+ 7dB in 424uHz , convert to 2.5Khz b/w? The noise power is proportional to the bandwidth; the signal power stays the same. So the SNR is inversely proportional to the bandwidth. It can be calculated like this: 2.5kHz / 424uHz = 5.9 x 10^6 10 log10 (5.9 x 10^6) = 67.7dB SNR in 2.5kHz BW = (SNR in 424uHz BW) - 67.7dB = 7dB - 67.7dB = -60.7dB Cheers, Jim Moritz 73 de M0BMU