Return-Path: Received: from mtain-md01.r1000.mx.aol.com (mtain-md01.r1000.mx.aol.com [172.29.96.85]) by air-md01.mail.aol.com (v129.4) with ESMTP id MAILINMD014-8b774d5f91a213a; Sat, 19 Feb 2011 04:47:14 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md01.r1000.mx.aol.com (Internet Inbound) with ESMTP id CBC233800008F; Sat, 19 Feb 2011 04:47:12 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PqjOb-0007U3-E6 for rs_out_1@blacksheep.org; Sat, 19 Feb 2011 09:46:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PqjOb-0007Ts-1K for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 09:46:33 +0000 Received: from mout5.freenet.de ([195.4.92.95]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PqjOZ-00057t-Ea for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 09:46:32 +0000 Received: from [195.4.92.19] (helo=9.mx.freenet.de) by mout5.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #3) id 1PqjMc-0000H6-5W for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 10:44:30 +0100 Received: from blfd-4db0f80a.pool.mediaways.net ([77.176.248.10]:2405 helo=[192.168.0.101]) by 9.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.72 #3) id 1PqjMb-0000Nd-VX for rsgb_lf_group@blacksheep.org; Sat, 19 Feb 2011 10:44:30 +0100 Message-ID: <4D5F90FC.2080403@freenet.de> Date: Sat, 19 Feb 2011 10:44:28 +0100 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4D5DDD5F.3050307@gmail.com> <4D5E6D92.2060608@freenet.de> <4D5F12D8.4010505@gmail.com> In-Reply-To: <4D5F12D8.4010505@gmail.com> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: HGA22 plot Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=0.0 required=5.0 tests=none 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-sid: 3039ac1d60554d5f91a0671f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Dex, you wrote: > I had moved the plot to 60 khz before I read your suggestion Wolf. > Here's what I am seeing tonight: > > http://www.w4dex.com/lf/HGA22_0030_19feb11.jpg > Interesting, the sine-shaped pattern is still there - and the 'oscillation' frequency is suspiciously constant. Would be interesting to see an FFT of the signal strength plot, to see how stable the frequency of the 'AM' is. To do that, one would have to export the data as a text file (which is possible), and import it into some post-processing software like matlab (which I don't have myself). Which function (especially the observed bandwidth for that signal) did you use to plot it, the peak function or the power (or effective voltage), in which frequency range ? I'd like to plot the same signal with the same BW here, just for comparison. I don't think I will have two different reflective layers on the signal path... 73, Wolf .