Return-Path: Received: from mtain-mc04.r1000.mx.aol.com (mtain-mc04.r1000.mx.aol.com [172.29.96.76]) by air-dd01.mail.aol.com (v129.4) with ESMTP id MAILINDD011-86074d9df5b917d; Thu, 07 Apr 2011 13:34:49 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 14F7C38000164; Thu, 7 Apr 2011 13:34:47 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q7t59-0005FC-CV for rs_out_1@blacksheep.org; Thu, 07 Apr 2011 18:33:23 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q7t58-0005F3-UG for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 18:33:22 +0100 Received: from mout3.freenet.de ([195.4.92.93]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q7t57-0004wE-Bv for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 18:33:22 +0100 Received: from [195.4.92.25] (helo=15.mx.freenet.de) by mout3.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #5) id 1Q7t56-0001If-G7 for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 19:33:20 +0200 Received: from blfd-5d8203d8.pool.mediaways.net ([93.130.3.216]:2387 helo=[192.168.0.101]) by 15.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.72 #3) id 1Q7t56-0004XA-8k for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 19:33:20 +0200 Message-ID: <4D9DF55E.90407@freenet.de> Date: Thu, 07 Apr 2011 19:33:18 +0200 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VLF QRM puzzle - why not the same in a split screen on SL? 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: 3039ac1d604c4d9df5b73434 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Roger, Guess the burst originates from a periodic signal (maybe something rich in harmonics), and one of the harmonics is closer to one of the frequency ranges than the other. Or.. the two bands are fed from two different sources - one before, and the other after the noise blanker, or clipper ? You can quickly check that in the 'circuit' window. But if you say it's just the split screen mode, then the two frequency ranges are indeed fed from the same FFT. All the best, Wolf . Am 07.04.2011 18:09, schrieb Roger Lapthorn: > Help... > > After lunch today my wife turned on the washing machine and the tumble > drier and for two periods there was a burst of interference visible on > the lower split screen as vertical noise stripes. What I don't > understand is why I don't see these also on the upper trace around > 8.976kHz too when the settings are the same. I have a SL filter > selected but it is centred around 8.970kHz with 400Hz width and slopes > so this cannot explain this. Surely the noise bursts should appear in > both parts of the screen? > > Can someone who understands Spectrum Lab explain this please? > > 73s > Roger G3XBM